WO2019224359A1 - Plantes comprenant des gènes de restauration de la stérilité mâle cytoplasmique de type g du blé, et leurs utilisations - Google Patents

Plantes comprenant des gènes de restauration de la stérilité mâle cytoplasmique de type g du blé, et leurs utilisations Download PDF

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WO2019224359A1
WO2019224359A1 PCT/EP2019/063479 EP2019063479W WO2019224359A1 WO 2019224359 A1 WO2019224359 A1 WO 2019224359A1 EP 2019063479 W EP2019063479 W EP 2019063479W WO 2019224359 A1 WO2019224359 A1 WO 2019224359A1
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plant
wheat
cereal
seq
cytoplasmic male
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PCT/EP2019/063479
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English (en)
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Mark Davey
John Jacobs
Colin Cavanagh
Antje ROHDE
Ruvini ARIYADASA
Arne VERSTICHELE
Michel Van Thournout
Alex WHAN
Jose BARRERO
Aswin SINGARAM
Andrew SPRIGGS
Bill BOVILL
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Basf Se
Commonwealth Scientific And Industrial Research Organisation
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Publication of WO2019224359A1 publication Critical patent/WO2019224359A1/fr

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01H—NEW PLANTS OR NON-TRANSGENIC PROCESSES FOR OBTAINING THEM; PLANT REPRODUCTION BY TISSUE CULTURE TECHNIQUES
    • A01H1/00—Processes for modifying genotypes ; Plants characterised by associated natural traits
    • A01H1/02—Methods or apparatus for hybridisation; Artificial pollination ; Fertility
    • A01H1/022—Genic fertility modification, e.g. apomixis
    • A01H1/023—Male sterility
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01H—NEW PLANTS OR NON-TRANSGENIC PROCESSES FOR OBTAINING THEM; PLANT REPRODUCTION BY TISSUE CULTURE TECHNIQUES
    • A01H1/00—Processes for modifying genotypes ; Plants characterised by associated natural traits
    • A01H1/04—Processes of selection involving genotypic or phenotypic markers; Methods of using phenotypic markers for selection
    • A01H1/045—Processes of selection involving genotypic or phenotypic markers; Methods of using phenotypic markers for selection using molecular markers
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01H—NEW PLANTS OR NON-TRANSGENIC PROCESSES FOR OBTAINING THEM; PLANT REPRODUCTION BY TISSUE CULTURE TECHNIQUES
    • A01H6/00—Angiosperms, i.e. flowering plants, characterised by their botanic taxonomy
    • A01H6/46—Gramineae or Poaceae, e.g. ryegrass, rice, wheat or maize
    • A01H6/4678—Triticum sp. [wheat]
    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07K—PEPTIDES
    • C07K14/00—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof
    • C07K14/415—Peptides having more than 20 amino acids; Gastrins; Somatostatins; Melanotropins; Derivatives thereof from plants
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
    • C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
    • C12N15/09—Recombinant DNA-technology
    • C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
    • C12N15/79—Vectors or expression systems specially adapted for eukaryotic hosts
    • C12N15/82—Vectors or expression systems specially adapted for eukaryotic hosts for plant cells, e.g. plant artificial chromosomes (PACs)
    • C12N15/8241—Phenotypically and genetically modified plants via recombinant DNA technology
    • C12N15/8261—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield
    • C12N15/8287—Phenotypically and genetically modified plants via recombinant DNA technology with agronomic (input) traits, e.g. crop yield for fertility modification, e.g. apomixis
    • C12N15/8289—Male sterility

Definitions

  • Plants comprising wheat G-type cytoplasmic male sterility restorer genes and uses thereof
  • the present invention relates generally to the field of plant breeding and molecular biology and concerns a method for selecting or producing a cereal plant comprising a restorer gene for wheat G-type cytoplasmic male sterility, and nucleic acids for use therein.
  • CMS Cytoplasmic male sterility
  • Triticum timopheevii G-type
  • Aegilops kotschyi K-type
  • Ma et al. (Genome 34:727-732, 1991) transferred an Rf gene locus from Aegilops umbellulata to wheat; two independent translocation lines with the Rf locus being located on either chromosome 6AS or 6BS were created (from Zhou et al., 2005, Euphytica 141(1-2):33— 40, doi: 10.1007/s10681 -005-5067-5).
  • WO2017158126A1 and WO2017158128A1 have provided more accurate markers to identify and track the Rf1 locus on chromosome 1AS, as present for example in wheat line PI 583676 (USDA National Small Grains Collection).
  • Geyer et al., (2017, Molecular Genetics and Genomics, https://doi.org/10.1007/s00438-017-1396-z, online 11/2017) map the same Rf locus as Rf1 in restorer lines R3, R113, and L19 and estimated its effect in populations.
  • the invention provides a(n) (isolated or modified) nucleic acid molecule(s) encoding a functional restorer of fertility gene (Rf) allele for wheat G-type cytoplasmic male sterility, wherein the functional restorer gene allele is a functional allele encoding a pentatricopeptide repeat protein (PPR) gene comprised within the nucleotide sequence of SEQ ID NO: 1.
  • Rf functional restorer of fertility gene
  • PPR pentatricopeptide repeat protein
  • the functional restorer gene may comprise a nucleotide sequence selected from a nucleotide sequence having at least 85% sequence identity to SEQ ID NO: 4 from the nucleotide at position 40 to the nucleotide at position 2226; a nucleotide sequence having at least 85% sequence identity to SEQ ID NO: 4; or a nucleotide sequence encoding a polypeptide comprising an amino acid sequence having at least 85% sequence identity to SEQ ID NO: 5.
  • the functional restorer gene allele may encode a PPR protein capable of binding to the mRNA of ORF256, preferably to a nucleotide sequence comprising nt 71-86 of SEQ ID NO: 2, although the PPR protein may also be capable of interacting with other sites on orf256, or with other mitochondrial and/or organellar transcripts or peptides, and may be obtainable from USDA accession number PI 583676.
  • 4 may also be transcribed at least 2-fold higher, or at least 5-fold higher or at least 10-fold higher in wheat lines with a functional Rf1 restorer, than in non -Rf1 lines, although in most instances the difference observed consists of significant detection of transcription in wheat lines with a functional Rf1 restorer and no detectable transcription in non -Rf1 lines.
  • a(n) (isolated or modified) polypeptide is provided encoded by the nucleic acid molecules described herein or comprising an amino acid sequence having at least 85% sequence identity to the amino acid sequence of SEQ ID NO: 5, preferably over the entire length of the polypeptide.
  • a chimeric gene comprising the following operably linked elements (a) a plant-expressible promoter; (b) a nucleic acid comprising the nucleic acid molecule herein described or encoding the polypeptide herein described; and optionally (c) a transcription termination and polyadenylation region functional in plant cells, wherein at least one of the operably linked elements is heterologous with respect to at least one other element, or contains a modified sequence.
  • the plant-expressible promoter (a) may be heterologous with respect to the nucleic acid encoding the polypeptide herein described (b) or may be heterologous with respect to the transcription termination and polyadenylation region (c), when the latter is present, or the nucleic acid encoding the polypeptide herein described (b) may be heterologous with respect to the transcription termination and polyadenylation region (c), when the latter is present.
  • the plant expressible promoter may be capable of directing expression of the operably linked nucleic acid at least during (early) pollen development and meiosis, such as in anther or, more specifically, tapetum, or developing microspores.
  • the invention further provides cereal plant cells or cereal plants or seeds thereof, such as wheat plant cells or plant or seed thereof, comprising the nucleic acid molecules or the polypeptides or the chimeric genes herein described, preferably wherein the polypeptide, the nucleic acid, or the chimeric gene in each case is heterologous with respect to the plant cell or plant or seed.
  • the nucleic acid molecules or the chimeric genes may be transcribed at least 2-fold higher.
  • the invention further provides a method for producing a cereal plant cell or plant or seed thereof, such as a wheat plant cell or plant or seed thereof, with restoration capacity for wheat G-type cytoplasmic male sterility, or a method for increasing restoration capacity for wheat G-type cytoplasmic male sterility (“CMS”) in a cereal plant, such as a wheat plant, comprising the steps of providing or expressing or increasing the expression of one or more polypeptides as herein described, in the plant cell or plant or seed.
  • the Rf-PPR polypeptide may be provided by modifying the genome of the plant to comprise the nucleic acid molecule or the chimeric gene herein described wherein the step of modifying includes by transformation, crossing, backcrossing, genome editing or mutagenesis.
  • a modified nucleic acid encoding a Rf1-PPR-07 protein wherein said nucleic acid is modified by genome editing or mutagenesis (e.g., EMS mutagenesis).
  • a method for converting a non-restoring cereal plant, such as a wheat plant, into a restoring plant for wheat G-type cytoplasmic male sterility (“CMS”), or for increasing restoration capacity for wheat G-type cytoplasmic male sterility (“CMS”) in a cereal plant, such as a wheat plant comprising the step of modifying the genome of the plant to comprise the nucleic acid molecule or the chimeric gene herein described wherein the step of modifying comprises modifying by transformation, crossing, backcrossing, genome editing or mutagenesis.
  • the invention further provides cereal plant cells or cereal plants or seeds thereof, such as a wheat plant cells or plants or seeds thereof, obtained according to the methods herein described, preferably wherein the plant has an increased restoration capacity for wheat G-type cytoplasmic male sterility (“CMS”), preferably wherein the Rf-PPR polypeptide described, is expressed at least during (early) pollen development and meiosis, such as in anther or, more specifically, tapetum, or developing microspores.
  • CMS cytoplasmic male sterility
  • the plant cell, plant or seed may be a hybrid plant cell, plant or seed.
  • such plant has a modified Rfl-PPR-07 nucleic acid and/or protein that results in improved restoration of G- type CMS in a cereal, such as a wheat, plant compared to the restoration obtained with the native Rf1-PPR-07 nucleic acid sequence.
  • a method for selecting a cereal plant comprising a functional restorer gene allele for wheat G-type cytoplasmic male sterility or for producing a cereal plant comprising a functional restorer gene allele for wheat G-type cytoplasmic male sterility comprising the steps of (a) identifying the presence, expression or transcription, such as by transcription analysis, of a nucleotide sequence comprising the nucleotide sequence of SEQ ID NO: 4 from nucleotide position 40 to nucleotide position 2226; and optionally selecting the plant comprising, expressing or transcribing the nucleotide sequence.
  • the invention also provides a method for restoring fertility in a progeny of a G-type cytoplasmic male sterile cereal plant or for producing a fertile progeny plant from a G-type cytoplasmic male sterile cereal parent plant, comprising the steps of (a) providing a population of progeny plants obtained from crossing a female cereal parent plant with a male cereal parent plant, wherein the female parent plant is a G-type cytoplasmic male sterile cereal plant, and wherein the male parent plant comprises a functional restorer gene allele for wheat G-type cytoplasmic male sterility comprising or transcribing the nucleotide sequence of SEQ ID NO: 1 (partially) or SEQ ID NO: 4; (b) identifying in the population a fertile progeny plant comprising, expressing or transcribing the nucleotide sequence of SEQ ID NO: 1 (partially) or SEQ ID NO: 4; and optionally (c) selecting the fertile progeny plant; and optional
  • a method for identifying and/or selecting a cereal (e.g. wheat) plant comprising a functional restorer gene allele for wheat G-type cytoplasmic male sterility comprising the steps of (a) identifying or detecting in the plant the presence, expression or transcription of a nucleic acid or of the Rf-PPR polypeptide or of chimeric genes as herein provided and optionally selecting the plant comprising, expressing or transcribing the nucleic acid or polypeptide or chimeric gene.
  • the invention also provides use of the nucleic acid as herein described to identify one or more further functional restorer gene alleles for wheat G-type cytoplasmic male sterility.
  • nucleic acids, polypeptides or chimeric genes as herein described for the identification of a plant comprising and/or expressing a functional restorer gene allele for wheat G-type cytoplasmic male sterility.
  • the plants comprising and/or expressing the functional restorer gene for wheat G-type cytoplasmic male sterility as herein described may be used for restoring fertility in a progeny of a G-type cytoplasmic male sterile cereal plant, such as a wheat plant and/or for producing hybrid seed or a population of hybrid cereal plants, such as wheat seed or plants.
  • Figure 1 (A) Predicted gene structure for the identified Rf1-PPR-07 gene. @ indicates CDS, # indicates 5’ UTR, and * indicates 3’ UTR. (B) amino acid sequence of identified Rf1-PPR-07 gene indicating the transit peptide (italic) and the pentatricopeptide repeat (PPR) motifs (alternatingly underlined and not underlined) including the 5th and 35th amino acid implied in RNA recognition (bold). (C) Graphical representation of the structure of the Rf1-PPR-07 polypeptide with PPR motifs.
  • FIG. 2 Relative expression levels of Rf1-PPR-07 gene in tissues of Rf1 restorer (R) and wild-type (WT) (nonrestorer) F4 progeny of a cross between PI 583676 and a CMS line.
  • R/T-containing progeny were identified following KASP genotyping with fine-mapping markers and phenotyped to confirm restoration of fertility.
  • Figure 3 Mean relative expression levels of Rf1-PPR-07 gene across 6 contrasting NIL pairs each with/without the Rf1 locus, as well as in a control line not containing the Rf1 locus and in Rf1 donor line.
  • R/T-containing progeny were identified following KASP genotyping with fine-mapping markers and phenotyped to confirm restoration of fertility.
  • the present invention describes the identification of a functional restorer (Rf) gene for wheat G-type cytoplasmic male sterility (i.e., lines containing T. timopheevii cytoplasm) located on chromosome 1A (short arm 1AS), as well as methods to detect the Rf gene.
  • Rf functional restorer
  • These methods can be used in marker-assisted selection (MAS) of cereal plants, such as wheat, comprising said functional restorer genes located on chromosomes 1A.
  • MAS marker-assisted selection
  • the present disclosure also allows the identification of plants lacking the desired gene, so that non-restorer plants can be identified and, e.g., eliminated from subsequent crosses.
  • the identification of a restorer gene underlying the Rf1 locus on chromosome 1AS further allows targeted engineering to e.g. increase expression thereof, or increased activity, or targeted combination of the gene underlying the Rf1 locus with other restorer loci or genes.
  • Backcross breeding is the process of crossing a progeny back to one of its parents. Backcrossing is usually done for the purpose of introgressing one or several loci from a donor parent into an otherwise desirable genetic background from the recurrent parent. The more cycles of backcrossing that are performed, the greater the genetic contribution of the recurrent parent to the resulting variety. This is often necessary, because donor parent plants may be otherwise undesirable, e.g., due to low yield, low fecundity or the like.
  • varieties which are the result of intensive breeding programs may have excellent yield, fecundity or the like, merely being deficient in one desired trait such as fertility restoration.
  • backcrossing can be done to select for or against a trait.
  • Male fertile on the other hand relates to plants capable of producing sufficient levels of functional pollen and male gametes, preferably normal levels.
  • Male sterility/fertility can be reflected in fertile/viable seed set upon selfing, e.g. by bagging heads to induce self-fertilization.
  • fertility restoration can also be described in terms of seed set upon crossing a male sterile plant with a plant carrying a functional restorer gene, when compared to seed set resulting from crossing (or selfing) fully fertile plants.
  • Partial failure to produce pollen or male gametes preferably refers to plants which produce less than 20%, less than 15% or less than 10% fertile seed upon selfing, or even less than 5%.
  • a male parent or pollen parent is a parent plant that provides the male gametes (pollen) for fertilization, while a female parent or seed parent is the plant that provides the female gametes for fertilization, said female plant being the one bearing the seeds.
  • Cytoplasmic male sterility or“CMS” as used herein refers to cytoplasmic-based and maternally-inherited male sterility.
  • CMS is total or partial male sterility in plants as the result of specific nuclear and mitochondrial interactions and is maternally inherited via the cytoplasm.
  • Male sterility is the failure or partial failure of plants to produce functional anthers, pollen, or male gametes although CMS plants still produce viable female gametes. Partial failure to produce pollen or male gametes preferably refers to plants which produce less than 20%, less than 15% or less than 10% fertile seed upon selfing, or even less than 5%.
  • Cytoplasmic male sterility is used in agriculture to facilitate the production of hybrid seed.
  • Cytoplasmic male-sterility (“CMS”) is caused by one or more mutations in the mitochondrial genome (termed“sterile cytoplasm”) and is inherited as a dominant, maternally-transmitted trait.
  • sterile cytoplasm For cytoplasmic male sterility to be used in hybrid seed production, the seed parent must contain a sterile cytoplasm and the pollen parent must contain (nuclear) restorer genes (Rf genes) to restore the fertility of the hybrid plants grown from the hybrid seed. Accordingly, such Rf genes are preferably at least partially dominant, most preferably dominant, in order to have sufficient restoring ability in the offspring.
  • “Wheat G-type cytoplasmic male sterility”, as used herein refers to the cytoplasm of Triticum timopheevii that can confer male sterility when introduced into common wheat (i.e. Triticum aestivum), thereby resulting in a plant carrying common wheat nuclear genes but cytoplasm from T. timopheevii that is male sterile.
  • the cytoplasm of T.timopheevii (G- type) as inducers of male sterility in common wheat have been extensively studied (Wilson and Ross, 1962, supra; Kaul, Male sterility in higher plants. Springer Verlag, Berlin.1988; Lucken, Hybrid wheat. In Wheat and wheat improvement. Edited by E.G. Heyne.
  • T.timopheevii cytoplasm The origin of the CMS phenotype conferred by T.timopheevii cytoplasm is the expression of a novel chimeric gene/transcript termed orf256, which is located upstream of cox1 sequences and is cotranscribed with an apparently normal cox1 gene.
  • Antisera prepared against polypeptide sequences predicted from the orf256 nucleotide sequence recognized a 7-kDa protein present in the CMS line but not in the parental or restored lines (Song and Hedgcoth, Genome 37(2), 203-209, 1994; Hedgcoth et al., Curr. Genet. 41 , 357-365, 2002).
  • a functional restorer gene allele for wheat G-type cytoplasmic male sterility or“a functional restorer locus for wheat G-type cytoplasmic male sterility” or a“restorer QTL for wheat G-type cytoplasmic male sterility” indicates an allele that has the capacity to restore fertility in the progeny of a cross with a G-type cytoplasmic male sterility (“CMS”) line, i.e., a line carrying common wheat nuclear genes but cytoplasm from T. timopheevii. Restoration against G- type cytoplasm has e.g. been described by Robertson and Curtis (Crop Sci. 7, 493-495, 1967), Yen et al. (Can. J.
  • the restorer gene herein described is also more highly expressed, particularly in developing spikes, in wheat lines identified to comprise the Rf1 locus when compared to wheat lines which were identified as not comprising the Rf1 locus or compared to non-restoring wheat lines.
  • the mean relative expression level of the restorer gene in wheat lines identified to comprise the restoring Rf1 locus compared to the mean relative expression level of the restorer gene in wheat lines identified as not comprising the restoring Rf1 locus ranges from about 2- fold to at least about 25-fold higher, such as between 7-fold and 12-fold higher. Usually the ratio is about 10-fold higher.
  • protein levels encoded by the Rf1 gene are also increased in wheat lines identified to comprising the restoring Rf1 locus when compared to wheat lines identified as not comprising the restoring Rf1 locus and may equally be at least 2-fold higher, or ranging between about 2-fold to at least about 25-fold higher, such as between 7-fold and 12-fold higher.
  • the term "maintainer" refers to a plant that when crossed with the CMS plant does not restore fertility and maintains sterility in the progeny.
  • the maintainer is used to propagate the CMS line, and may also be referred to as a nonrestorer line.
  • Maintainer lines have the same nuclear genes as the CMS line (i.e. do not contain functional Rf genes) but differ in the composition of cytoplasmic factors that cause male sterility in plants i.e. maintainers have "fertile" cytoplasm. Therefore when a male sterile line is crossed with its maintainer, progeny with the same male sterile genotype will be obtained.
  • the term“cereal” and“cereal plant” refers to members of the monocotyledonous family Poaceae which are cultivated for the edible components of their grain. These grains are composed of endosperm, germ and bran. Maize, wheat and rice together account for more than 80% of the worldwide grain production. Other members of the cereal plant family comprise rye, oats, barley, triticale, sorghum, wild rice, spelt, einkorn, emmer, durum wheat and kamut.
  • A“female cereal plant” or“cytoplasmic male sterile cereal plant” is a cereal plant comprising cytoplasm causing male sterility, as herein described.
  • a cereal plant according to the invention is a cereal plant that comprises at least an A genome or related genome, such as hexaploid wheat ( T . aestivunr, ABD), spelt (T.rspelta ABD) durum ( T . turgidum AB), barley ( Hordeum vulgare H) and rye (Seca/e cerea/e; R) .
  • the cereal plant according to the invention is wheat (T. aestivunr, ABD).
  • KASP KBioscience Competitive Allele-Specific PCR
  • 70 base pairs upstream and 70 base pairs downstream of the SNP are selected and two allele-specific forward primers and one allele specific reverse primer is designed. See e.g. Allen et al. 2011 , Plant Biotechnology J. 9, 1086-1099, especially p1097-1098 for KASP assay method.
  • a locus refers to a certain place or position on the genome, e.g. on a chromosome or chromosome arm, where for example a gene or genetic marker is found.
  • a QTL quantitative trait locus
  • a locus refers to a position on the genome that corresponds to a measurable characteristic, i.e. a trait, such as the Rf loci.
  • allele(s) means any of one or more alternative forms of a gene at a particular locus.
  • alleles of a given gene are located at a specific location or locus (loci plural) on a chromosome.
  • loci plural locus
  • One allele is present on each chromosome of the pair of homologous chromosomes or possibly on homeologous chromosomes.
  • homologous chromosomes means chromosomes that contain information for the same biological features and contain the same genes at the same loci but possibly different alleles of those genes.
  • Homologous chromosomes are chromosomes that pair during meiosis.“Non-homologous chromosomes”, representing all the biological features of an organism, form a set, and the number of sets in a cell is called ploidy. Diploid organisms contain two sets of non-homologous chromosomes, wherein each homologous chromosome is inherited from a different parent.
  • tetraploid species two sets of diploid genomes exist, whereby the chromosomes of the two genomes are referred to as“homeologous chromosomes” (and similarly, the loci or genes of the two genomes are referred to as homeologous loci or genes).
  • hexaploid species have three sets of diploid genomes, etc.
  • a diploid, tetraploid or hexaploid plant species may comprise a large number of different alleles at a particular locus.
  • the term“heterozygous” means a genetic condition existing when two different alleles reside at a specific locus but are positioned individually on corresponding pairs of homologous chromosomes in the cell.
  • the term“homozygous” means a genetic condition existing when two identical alleles reside at a specific locus but are positioned individually on corresponding pairs of homologous chromosomes in the cell.
  • An allele of a particular gene or locus can have a particular penetrance, i.e. it can be dominant, partially dominant, co-dominant, partially recessive or recessive.
  • a dominant allele is a variant of a particular locus or gene that when present in heterozygous form in an organism results in the same phenotype as when present in homozygous form.
  • a recessive allele on the other hand is a variant of an allele that in heterozygous form is overruled by the dominant allele thus resulting in the phenotype conferred by the dominant allele, while only in homozygous form leads to the recessive phenotype.
  • Partially dominant, co-dominant or partially recessive refers to the situation where the heterozygote displays a phenotype that is an intermediate between the phenotype of an organism homozygous for the one allele and an organism homozygous for the other allele of a particular locus or gene.
  • This intermediate phenotype is a demonstration of partial or incomplete dominance or penetrance. When partial dominance occurs, a range of phenotypes is usually observed among the offspring. The same applies to partially recessive alleles.
  • A“contig”, as used herein refers to set of overlapping DNA segments that together represent a consensus region of DNA.
  • a contig refers to overlapping sequence data (reads); in top-down sequencing projects, contig refers to the overlapping clones that form a physical map of the genome that is used to guide sequencing and assembly. Contigs can thus refer both to overlapping DNA sequence and to overlapping physical segments (fragments) contained in clones depending on the context.
  • said functional restorer gene allele is a functional allele of a gene encoding a pentatricopeptide repeat (PPR) protein (i.e. a PPR gene) localising within the genomic region described in WO2017/158126.
  • PPR pentatricopeptide repeat
  • PPR proteins are classified based on their domain architecture.
  • P-class PPR proteins possess multiple canonical amino acid motifs, typically consisting of 35 amino acid residues, although the motifs can range between 34 and 36 or even 38 amino acids.
  • PPR proteins may contain a mitochondrial targeting peptide, but normally lack additional domains.
  • Members of this class have functions in most aspects of organelle gene expression.
  • PLS-class PPR proteins have three different types of PPR motifs, which vary in length; P (35 amino acids), L (long, 35-36 amino acids) and S (short, ⁇ 31 amino acids), and members of this class are thought to mainly function in RNA editing. Subtypes of the PLS class are categorized based on the additional C-terminal domains they possess (reviewed by Manna et al., 2015, Biochimie 113, p93-99, incorporated herein by reference).
  • Rf genes identified to date come from a small clade of genes encoding PPR proteins (Fuji et al., 2011 , PNAS 108(4), 1723-1728 - herein incorporated by reference).
  • PPR genes functioning as fertility restoration (Rf) genes are referred to in Fuji (supra) as Rf-PPR genes. They are comprised primarily of tandem arrays of 15-20 PPR motifs, each composed of about 35 amino acids.
  • Rf-PPR genes belong to the P-class Rf-PPR subfamily, although PLS-class Rf-PPR genes have also been identified. High substitution rates observed for particular amino acids within otherwise very conserved PPR motifs, indicating diversifying selection, prompted the conclusion that these residues might be directly involved in binding to RNA targets.
  • a functional allele of a Rf-PPR gene refers to an allele of a Rf-PPR gene that is a functional restorer gene allele for wheat G-type cytoplasmic male sterility as described herein, i.e. that when expressed in a (sexually compatible) cereal plant has the capacity to restore fertility in the progeny of a cross with a G-type cytoplasmic male sterile cereal plant.
  • a functional allele of a Rf-PPR gene is also referred to as a PPR-Rf gene (or Rf-PPR gene), which in turn encodes a Rf-PPR (or PPR-Rf) protein.
  • a functional restorer gene allele encodes a polypeptide, such as a PPR protein that has the capacity to (specifically) bind to the mitochondrial orf256 (SEQ ID NO: 2) transcript responsible for the CMS phenotype.
  • a functional restorer gene allele encodes a polypeptide, such as a PPR protein that has the capacity to (specifically) bind to the mitochondrial orf256 (SEQ ID NO: 2) transcript responsible for the CMS phenotype.
  • the PPR protein contains a number of PPR motifs with specific residues at positions 5 and 35 and which are ordered in such a way so as to be able to bind to a target mRNA, such as the orf256 mRNA, in a sequence-specific or sequence-preferential manner.
  • the functional restorer gene allele may encode a polypeptide, such as a PPR protein that has the capacity to (specifically) bind to other mitochondrial mRNAs or chimeric mRNAs responsible for the pollen lethality and the CMS phenotype.
  • the functional restorer gene allele may also encode a polypeptide, such as a PPR protein that has the capacity to (specifically) bind to multiple mitochondrial mRNAs, influencing transcription etc.
  • the functional restorer gene allele may encode a polypeptide, such as a PPR protein that is able to form a complex with additional interacting proteins such as a glycine rich protein (GRP), a hexokinase, or a DUF-WD40, to direct breakdown or cleavage of orf256 and/or other cytotoxic mitochondrial or plastidic mRNAs, or to inhibit transcription thereof, or to inhibit translation of the cytotoxic, chimeric peptides responsible for the CMS phenotype.
  • GRP glycine rich protein
  • hexokinase a hexokinase
  • DUF-WD40 DUF-WD40
  • the functional restorer gene allele can encode a PPR protein containing PPR motifs with specific residues at the positions 5 and 35 so as to recognize a target sequence within orf256 mRNA.
  • the predicted recognition sequence of Rf1-PPR-07 as defined by a probability matrix was found to be located at a position -16 (upstream) of the ATG start codon of SEQ ID NO: 2 ( orf256 position 71-86).
  • a possible mechanism for the mode of action of Rf1-PPR-07 protein may be the blocking of the translation of the cytotoxic orf256 transcript and directing transcription towards coxl transcription.
  • T. aestivum lines containing G-type CMS there is production of long chimeric mRNA transcripts encompassing the orf256 and coxl gene sequences in a single chimeric mRNA, leading to translation of orf256 and thus production of the cytotoxic ORF256 protein.
  • T. aestivum lines containing G-type CMS then there is still transcription of the long orf256 - coxl RNA, but no longer translation of the ORF256 protein. It is presumed that the binding of Rfl-PPR-07 to its target site prevents translation of the ORF256 in the long chimeric mRNA.
  • PPR proteins may work in conjunction with other PPR proteins, which may be encoded by a gene in the same Rf locus, and/or by a gene located in any of the other Rf loci, including the Rf3 locus identified on chromosome 1 B (described in WO2017/158127).
  • the Rfl-PPR-07 gene is used in cereal plants such as wheat plants in combination with one or more of the Rf loci or Rf genes selected from the group of Rf2, Rf3, Rf4, Rf5, Rf6, Rf7, and Rf8; such as in combination with Rf3 and Rf6, in combination with Rf3 and Rf7, in combination with Rf4 and Rf6, in combination with Rf4 and Rf7, or in combination with Rf3 and Rf4.
  • such a combination of Rf loci or Rf genes with the Rfl-PPR-07 gene of the invention occurs at the same locus in the wheat genome (e.g., by translocation, transformation or genome engineering into one locus).
  • a functional restorer gene or allele can for example comprise the nucleotide sequence of SEQ ID NO: 4 or encode a polypeptide having the amino acid sequence of SEQ ID NO: 5.
  • a functional restorer gene allele can for example also encode a PPR protein, having one or more mutations (insertion, deletion, substitution) that may affect mRNA or protein stability, for example a mutation that increases mRNA or protein stability, thereby resulting in an increased expression of the PPR protein, especially during early pollen development and meiosis, such as in anther or, more specifically, tapetum, or developing microspore.
  • a mutation that increases mRNA or protein stability for example a mutation that increases mRNA or protein stability, thereby resulting in an increased expression of the PPR protein, especially during early pollen development and meiosis, such as in anther or, more specifically, tapetum, or developing microspore.
  • the functional restorer gene allele is a functional allele of the Rf-PPR gene comprising the nucleotide sequence of SEQ ID NO: 4 from nucleotide position 40 to nucleotide position 2226, or SEQ ID NO: 4, or a nucleotide sequence encoding the polypeptide sequence of SEQ ID NO: 5.
  • the functional restorer gene allele can comprise a nucleotide sequence that is substantially identical (as defined herein) to SEQ ID NO: 4, such as having at least 85%, 85.5%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, or 99% sequence identity to SEQ ID NO: 4 from nucleotide position 40 to nucleotide position 2226.
  • the percent sequence identity is preferably calculated over the entire length of the nucleotide sequence of SEQ ID NO: 4 from nucleotide position 40 to nucleotide position 2226.
  • the functional restorer gene allele can also comprise a nucleotide sequence that encodes an amino acid sequence having at least 85%, 86%, 87%, 88%, 89%, 90%, 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98% or 99% sequence identity to SEQ ID NO: 5.
  • the percent sequence identity is preferably calculated over the entire length of the polypeptide of SEQ ID NO: 5.
  • the functional restorer gene allele is a functional restorer gene allele as present in (and as derivable from) at least Accession number PI 583676 (USDA National Small Grains Collection, also known as Dekalb 582M and registered as US PVP 7400045).
  • the invention further describes a method for producing a cereal (e.g. wheat) plant comprising a functional restorer gene allele for wheat G-type cytoplasmic male sterility, comprising the steps of
  • identifying (and optionally selecting) a progeny plant comprising, or comprising and transcribing, the functional restorer gene allele for wheat G-type cytoplasmic male sterility located on chromosome 1A by identifying a progeny plant comprising at least a nucleotide sequence substantially identical to SEQ ID NO: 4 from nucleotide position 40 to nucleotide position 2226, or a nucleotide sequence encoding a polypeptide comprising an amino acid sequence substantially identical to SEQ ID NO: 5.
  • Also provided is a method for producing a cereal plant comprising a functional restorer gene allele for wheat G-type cytoplasmic male sterility located on chromosome 1A, comprising the steps of
  • the second cereal plant may be a plant devoid of a functional restorer gene for wheat G-type cytoplasmic male sterility located on chromosome 1 A, including a cereal plant not transcribing or expressing the identified restorer gene.
  • the invention provides a method for producing F1 hybrid cereal seeds or F1 cereal hybrid plants, comprising the steps of:
  • a male cereal (e.g. wheat) parent plant comprising, or comprising and expressing, a functional restorer gene allele for wheat G-type cytoplasmic male sterility located on chromosome 1A and having a nucleotide sequence substantially identical to SEQ ID NO: 4 from nucleotide position 40 to nucleotide position 2226, or a nucleotide sequence encoding a polypeptide comprising an amino acid sequence substantially identical to SEQ ID NO: 5;
  • the F1 hybrid seeds and plants preferably comprise at least one marker allele linked to a functional restorer gene allele for wheat G-type cytoplasmic male sterility located on chromosome 1A as described herein, and the F1 plants grown from the seeds are therefore fertile.
  • the male parent plant is homozygous for said functional restorer gene allele for wheat G-type cytoplasmic male sterility located on chromosome 1A.
  • the male parent plant used for crossing can be selected or identified by analyzing the presence, or transcription, or expression, of a nucleotide sequence substantially identical to SEQ ID NO: 4 from nucleotide position 40 to nucleotide position 2226, or a nucleotide sequence encoding a polypeptide comprising an amino acid sequence substantially identical to SEQ ID NO: 5.
  • the invention also provides cereal plants, such as wheat plants, obtained by any of the above methods, said cereal plant comprising, expressing or transcribing a nucleotide sequence substantially identical to SEQ ID NO: 4 from nucleotide position 40 to nucleotide position 2226, or a nucleotide sequence encoding a polypeptide comprising an amino acid sequence substantially identical to SEQ ID NO: 5.
  • Such plants may contain the functional restorer gene allele for wheat G-type cytoplasmic male sterility in a different genomic context, and may e.g. be devoid of the nucleotide sequence of SEQ ID NO: 1 from position 1 to position 2004 and/or of the nucleotide sequence of SEQ ID NO: 1 from position 6480 to position 7929, or being devoid of any of the following nucleotide sequences, or combinations thereof: the nucleotide sequence of SEQ ID NO: 1 from position 1 to position 500, the nucleotide sequence of SEQ ID NO: 1 from position 1 to position 1000, the nucleotide sequence of SEQ ID NO: 1 from position 1 to position 1500, the nucleotide sequence of SEQ ID NO: 1 from position 2004, the nucleotide sequence of SEQ ID NO: 1 from position 500 to position 1000, the nucleotide sequence of SEQ ID NO: 1 from position 500 to position 1500, the nucleotide sequence of SEQ ID NO: 1 from position
  • nucleotide sequence of SEQ ID NO: 1 from position 6480 to position 6500 the nucleotide sequence of SEQ ID NO: 1 from position 6480 to position 7000, the nucleotide sequence of SEQ ID NO: 1 from position 6480 to position 7500
  • nucleotide sequence of SEQ ID NO: 1 from position 6480 to position 7929 the nucleotide sequence of SEQ ID NO: 1 from position 6500 to position 7000, the nucleotide sequence of SEQ ID NO: 1 from position 6500 to position 7500
  • nucleotide sequence of SEQ ID NO: 1 from position 6500 to position 7929 the nucleotide sequence of SEQ ID NO: 1 from position 7000 to position 7500
  • nucleotide sequence of SEQ ID NO: 1 from position 7000 to position 7929 the nucleotide sequence of SEQ ID NO: 1 from position 7000 to position 7500
  • nucleotide sequence of SEQ ID NO: 1 from position 7000 to position 7929 or the nu
  • plants, plant parts, plant cells and seed from the cereal plants according to the invention comprising or comprising and expressing the functional restorer gene allele.
  • the plants, plant parts, plant cells and seeds of the invention may also be hybrid plants, plant parts, plant cells or seeds.
  • a method for the identification and/or selection of a cereal (e.g. wheat) plant comprising a functional restorer gene allele for wheat G-type cytoplasmic male sterility comprising the steps of
  • identifying or detecting in said plant the presence of the nucleic acid having a nucleotide sequence substantially identical to SEQ ID NO: 4 from nucleotide position 40 to nucleotide position 2226, or a nucleotide sequence encoding a polypeptide comprising an amino acid sequence substantially identical to SEQ ID NO: 5 or the polypeptide comprising an amino acid sequence substantially identical to SEQ ID NO: 5
  • identifying or detecting can involve obtaining a biological sample (e.g. protein) or genomic DNA and determining the presence of the nucleic acid or polypeptide according to methods well known in the art, such as hybridization, PCR, Rt-PCR, Southern blotting, Southern-by-sequencing, SNP detection methods (e.g. as described herein), western blotting, ELISA, etc. based on the sequences provided herein.
  • the invention also provides the use of the sequence(s) of the functional restorer gene for wheat G-type cytoplasmic male sterility located on chromosome 1A for the identification of at least one further marker comprising an allele linked to said functional restorer gene for wheat G-type cytoplasmic male sterility located on chromosome 1 A.
  • markers are also genetically linked or tightly linked to the restorer gene, and are also within the scope of the invention. Markers can be identified by any of a variety of genetic or physical mapping techniques.
  • the invention further provides the use of a nucleotide sequence substantially identical to SEQ ID NO: 4 from nucleotide position 40 to nucleotide position 2226, or a nucleotide sequence encoding a polypeptide comprising an amino acid sequence substantially identical to SEQ ID NO: 5, or the use of a polypeptide substantially identical to the amino acid sequence of SEQ ID NO: 5 for the identification of a plant comprising said functional restorer gene for wheat G-type cytoplasmic male sterility or for producing hybrid seed.
  • a recombinant nucleic acid molecule which comprises a functional restorer gene as described herein.
  • the recombinant DNA molecule comprises a plant expressible promoter, preferably a heterologous plant promoter, operably linked to a nucleotide sequence having substantial identity as herein defined to a nucleotide sequence of SEQ ID NO: 4 from nucleotide position 40 to nucleotide position 2226, or to the nucleotide sequence of SEQ ID NO: 4 or encoding a polypeptide comprising an amino acid sequence substantially identical to the amino acid sequence of SEQ ID NO: 5.
  • the recombinant DNA molecule may optionally comprise a transcription termination and polyadenylation region, preferably functional in plant cells.
  • a DNA vector is provided comprising the recombinant DNA.
  • the recombinant DNA molecule or DNA vector may be an isolated or modified nucleic acid molecule.
  • the DNA comprising the functional restorer gene may be in a microorganism, such as a bacterium (e.g. Agrobacterium or E. coli).
  • heterologous refers to the relationship between two or more nucleic acid or protein sequences that are derived from different sources.
  • a promoter is heterologous with respect to an operably linked nucleic acid sequence, such as a coding sequence, if such a combination is not normally found in nature.
  • a particular sequence may be "heterologous” with respect to a cell or organism into which it is inserted (i.e. does not naturally occur in that particular cell or organism).
  • heterologous when referring to a nucleic acid or protein occurring in a certain plant species, also includes a nucleic acid or protein whose sequence has been modified or mutated compared to the previously existing nucleic acid or protein sequence occurring in said plant species.
  • nucleic acid or protein sequence occurring in a wheat plant e.g., modifying a native promoter to include regulatory elements that increase transcription, such as an enhancer element, or modifying a native promoter by inactivating or removing certain negative regulatory elements, such as repressor elements or target sites for miRNAs or IncRNAs
  • a modified nucleic acid or protein is also considered heterologous to the wheat plant or to the operably-linked sequences.
  • the functional restorer gene allele can also encode a PPR protein having a mutation in an a-helical domain of a PPR motif, such as a mutation that affects hairpin formation between two of the a-helices making up a PPR motif.
  • the functional restorer gene allele can also encode a PPR protein having a mutation that affects dimerization of the PPR protein. It has e.g. been found that‘Thylakoid assembly 8’ (THA8) protein is a pentatricopeptide repeat (PPR) RNA-binding protein required for the splicing of the transcript of ycf3, a gene involved in chloroplast thylakoid-membrane biogenesis. THA8 forms an asymmetric dimer once bound to single stranded RNA, with the bound RNA at the dimer interface. This dimer complex formation is mediated by the N-terminal PPR motifs 1 and 2 and the C-terminal motifs 4 and 5 (Ke et al., 2013, Nature Structural & Molecular Biology, 20,1377-1382).
  • PPR pentatricopeptide repeat
  • the functional restorer gene allele can also encode a PPR protein which when expressed is targeted to the mitochondrion or other organelle. This can e.g. be accomplished by the presence of a (plant-functional) mitochondrial targeting sequence or mitochondrial signal peptide, or mitochondrial transit peptide or other organelle targeting signal.
  • a mitochondrial targeting signal is a 10-70 amino acid long peptide that directs a newly synthesized protein to the mitochondria, typically found at the N-terminus.
  • Mitochondrial transit peptides are rich in positively charged amino acids but usually lack negative charges. They have the potential to form amphipathic a-helices in non-aqueous environments, such as membranes.
  • Mitochondrial targeting signals can contain additional signals that subsequently target the protein to different regions of the mitochondria, such as the mitochondrial matrix. Like signal peptides, mitochondrial targeting signals are cleaved once targeting is complete. Mitochondrial transit peptides are e.g. described in Shewry and Gutteridge (1992, Plant Protein Engineering, 143-146, and references therein), Sjoling and Glaser (Trends Plant Sci Volume 3, Issue 4, 1 April 1998, Pages 136-140), Pfanner (2000, Current Biol, Volume 10, Issue 11 , pages R412-R415), Huang et al (2009, Plant Phys 150(3): 1272-1285), Chen et al. (1996, PNAS, Vol. 93, pp. 11763-11768), Fuji et al. (Plant J 2016, 86, 504- 513).
  • the amino acid sequence of SEQ ID NO: 5 from position 1 to position 48 is an example of such mitochondrial targeting sequence.
  • said functional restorer gene allele encoded by said (isolated) nucleic acid molecule is obtainable from USDA accession number PI 583676.
  • polypeptide encoded by the nucleic acid molecule as described above, the polypeptide being a functional restorer protein for wheat G-type cytoplasmic male sterility, or comprising an amino acid sequence substantially identical to the amino acid sequence of SEQ ID NO: 5.
  • the functional restorer gene allele may also be cloned and a chimeric gene may be made, e.g. by operably linking a plant expressible promoter to the functional restorer gene allele and optionally a 3’ end region involved in transcription termination and polyadenylation functional in plants.
  • a chimeric gene may be introduced into a plant cell, and the plant cell may be regenerated into a whole plant to produce a transgenic plant.
  • the transgenic plant is a cereal plant, such as a wheat plant, according to any method well known in the art.
  • a chimeric gene comprising a(n) (isolated or modified) nucleic acid molecule encoding the functional restorer gene allele as described above, operably linked to a heterologous plant- expressible promoter and optionally a 3’ termination and polyadenylation region.
  • a host or host cell such as a (cereal) plant cell or (cereal) plant or seed thereof, such as a wheat plant cell or plant or seed thereof, comprising the (isolated or modified) nucleic acid molecule, (isolated or modified) polypeptide, or the chimeric gene as described above is provided, wherein preferably said polypeptide, said nucleic acid, or said chimeric gene in each case is heterologous with respect to said plant cell or plant or seed, or is modified.
  • the host cell can also be a bacterium, such as E.coli or Agrobacterium sp. such as A. tumefaciens.
  • a method for producing a cereal plant cell or plant or seed thereof such as a wheat plant cell or plant or seed thereof, comprising a functional restorer gene for wheat G-type cytoplasmic male sterility, or a method for increasing restoration capacity for wheat G-type cytoplasmic male sterility (“CMS”) in a cereal plant, such as a wheat plant, comprising the steps of providing said plant cell or plant with the isolated or modified nucleic acid molecule, or the chimeric gene as described herein wherein said providing comprises transformation, crossing, backcrossing, genome editing or mutagenesis.“Restoration capacity”, as used herein, means the capacity of a plant to restore fertility in the progeny of a cross with a G-type cytoplasmic male sterility line.
  • said plant expresses or has increased expression of the polypeptide according to the invention.
  • said (increase in) expression is at least during (the early phases of) pollen development and meiosis, such as in anther or, more specifically, tapetum, or developing microspores (where said plant did not express or to a lesser extent expressed the polypeptide prior to the providing step).
  • a method for producing a cereal plant cell or plant or seed thereof, such as a wheat plant cell or plant or seed thereof, with restoration capacity for wheat G-type cytoplasmic male sterility or a method for increasing restoration capacity for wheat G-type cytoplasmic male sterility in a cereal plant, such as a wheat plant, comprising the steps of increasing the expression of the (isolated or modified) polypeptide as described herein in said plant cell or plant or seed.
  • said (increase in) expression is at least during (the early phases of) pollen development and meiosis, such as in anther or, more specifically, tapetum, or developing microspores.
  • the expression of the polypeptide as described herein is increased by engineering the nucleotide sequence encoding the restorer polypeptide, including by deliberate modification of the nucleotide sequence of the gene encoding the restorer polypeptide, such as increasing gene copy number of the gene, inserting modifications that increase stability of the RNA transcribed from the gene or of the polypeptide expressed from the gene, modifications of the upstream region/promoter region, modifications of the transcription termination and polyadenylation region etc.
  • Increasing the expression can be done by providing the plant with the (recombinant) chromosome fragment or the (isolated or modified) nucleic acid molecule or the chimeric gene as described herein, whereby the nucleic acid encoding the functional restorer gene allele is under the control of appropriate regulatory elements such as a promoter driving expression in the desired tissues/cells, but also by providing the plant with transcription factors that e.g. (specifically) recognise the promoter region and promote transcription, such as TAL effectors, dCas (“dead” Cas), dCpfl (“dead” Cpf1) etc. coupled to transcriptional enhancers.
  • transcription factors e.g. (specifically) recognise the promoter region and promote transcription, such as TAL effectors, dCas (“dead” Cas), dCpfl (“dead” Cpf1) etc. coupled to transcriptional enhancers.
  • a method for converting a cereal plant, such as a wheat plant, not having the capacity to restore fertility in the progeny of a cross with a G-type cytoplasmic male sterility line (a non-restorer plant) into a plant having the capacity to restore fertility in the progeny of a cross with a G-type cytoplasmic male sterility line (a restorer plant), comprising the steps of modifying the genome of said plant to comprise (or to comprise and express) the (isolated or modified) nucleic acid molecule or the chimeric gene encoding a functional restorer gene allele for wheat G-type cytoplasmic male sterility as described herein wherein said modifying comprises transformation, crossing, backcrossing, genome editing or mutagenesis, preferably by transformation, genome editing or mutagenesis.
  • said plant expresses the polypeptide according to the invention, particularly at least during (the early phases of) pollen development and meiosis, such as in anther or, more specifically, tapetum, or developing microspores.
  • said plant did not express or to a lesser extent expressed the polypeptide and/or did not have or to a lesser extent had restoration capacity for wheat G-type cytoplasmic male sterility.
  • a method for converting a non-restoring cereal plant, such as a wheat plant, into a restoring plant for wheat G-type cytoplasmic male sterility, or for increasing restoration capacity for wheat G-type cytoplasmic male sterility in a cereal plant, such as a wheat plant comprising the steps of modifying the genome of said plant to increase the expression of a polypeptide according to the invention in said plant.
  • said (increase in) expression is at least during (the early phases of) pollen development and meiosis such as in anther or, more specifically, tapetum, or developing microspores.
  • said plant did not express or to a lesser extent expressed the polypeptide and/or did not have or to a lesser extent had restoration capacity for wheat G-type cytoplasmic male sterility.
  • Modifying the genome to increase expression of the polypeptide can for example be done by modifying the native promoter to include regulatory elements that increase transcription, such as certain enhancer element, but also by inactivating or removing certain negative regulatory elements, such as repressor elements or target sites for miRNAs or IncRNAs.
  • the Rf 1 5’upstream region including the promoter is included in SEQ ID NO: 1 upstream of nucleotide 2005.
  • a plant cell or plant preferably a cereal plant cell or cereal plant or seed thereof, such as a wheat plant cell or plant or seed thereof, produced according to any of the above methods, preferably wherein said plant has an increased restoration capacity for wheat G-type cytoplasmic male sterility compared to said plant prior to the providing step or the modification step.
  • Use of such a plant obtained according to the above methods to restore fertility in the progeny of a cross with a G-type cytoplasmic male sterility plant or to produce hybrid plants or hybrid seed is also described.
  • Such a plant cell, plant or seed can be a hybrid plant cell, plant or seed.
  • Genome editing refers to the targeted modification of genomic DNA using sequence-specific enzymes (such as endonuclease, nickases, base conversion enzymes) and/or donor nucleic acids (e.g. dsDNA, oligo’s) to introduce desired changes in the DNA.
  • sequence-specific enzymes such as endonuclease, nickases, base conversion enzymes
  • donor nucleic acids e.g. dsDNA, oligo’s
  • Sequence-specific nucleases that can be programmed to recognize specific DNA sequences include meganucleases (MGNs), zinc-finger nucleases (ZFNs), TAL-effector nucleases (TALENs) and RNA- guided or DNA-guided nucleases such as Cas9, Cpfl , CasX, CasY, C2c1 , C2c3, certain Argonaut-based systems (see e.g. Osakabe and Osakabe, Plant Cell Physiol. 2015 Mar; 56(3):389-400; Ma et al., Mol Plant.
  • MGNs meganucleases
  • ZFNs zinc-finger nucleases
  • TALENs TAL-effector nucleases
  • RNA- guided or DNA-guided nucleases such as Cas9, Cpfl , CasX, CasY, C2c1 , C2c3, certain Argonaut-based systems (see e.g. Osakabe and Os
  • Donor nucleic acids can be used as a template for repair of the DNA break induced by a sequence specific nuclease but can also be used as such for gene targeting (without DNA break induction) to introduce a desired change into the genomic DNA.
  • plants lacking a functional restorer gene for wheat G-type cytoplasmic male sterility can be converted to restoring plants by making the desired changes to existing Rf-PPR genes or alternatively to introduce one or more complete sequences encoding functional Rf-PPR proteins, e.g. as described herein, at a specific genomic location.
  • Mutagenesis refers to e.g. EMS mutagenesis or radiation induced mutagenesis and the like.
  • T ransgenic cereal cells e.g. transgenic wheat cells, comprising in their genome a(n) (isolated or modified) nucleic acid molecule as described or a chimeric gene as described comprising a functional restorer gene allele as described are also an embodiment of the invention.
  • the DNA molecule comprising Rf allele is stably integrated into the cereal (e.g. wheat) genome.
  • cereal plants, plant parts, plant cells, or seeds thereof, especially wheat, comprising a nucleic acid molecule according to the invention or a polypeptide according to the invention or a chimeric gene according to the invention encoding a functional restorer gene according to the invention, are provided, said plant having the capacity to restore fertility against wheat G-type cytoplasmic male sterility are provided herein.
  • the nucleic acid molecule, polypeptide or chimeric gene is heterologous to the plant, such as transgenic cereal plants or transgenic wheat plants.
  • This also includes plant cells or cell cultures comprising such a chromosome fragment or nucleic acid molecule, polypeptide or chimeric gene, independent whether introduced by transgenic methods or by breeding methods.
  • the cells are e.g. in vitro and are regenerable into plants comprising the nucleic acid molecule or chimeric gene of the invention.
  • Said plants, plant parts, plant cells and seeds may also be hybrid plants, plant parts, plant cells or seeds.
  • Such plants may also be used as male parent plant in a method for producing F1 hybrid seeds or F1 hybrid plants, as described above.
  • a plant-expressible promoter as used herein can be any promoter that drives sufficient expression at least during (early) pollen development and meiosis, such as in anther, or more specifically in tapetum or developing microspore.
  • This can for example be a constitutive promoter, an inducible promoter, but also a pollen-, anther-, tapetum- or microspore- specific/preferential promoter.
  • a constitutive promoter is a promoter capable of directing high levels of expression in most cell types (in a spatio- temporal independent manner).
  • Examples of plant expressible constitutive promoters include promoters of bacterial origin, such as the octopine synthase (OCS) and nopaline synthase (NOS) promoters from Agrobacterium, but also promoters of viral origin, such as that of the cauliflower mosaic virus (CaMV) 35S transcript (Hapster et al., 1988, Mol. Gen. Genet. 212: 182-190) or 19S RNAs genes (Odell et al., 1985, Nature. 6;313(6005):810-2; U.S. Pat. No.
  • promoters of plant origin mention will be made of the promoters of the plant ribulose-biscarboxylase/oxygenase (Rubisco) small subunit promoter (US 4,962,028; W099/25842) from Zea mays and sunflower, the promoter of the Arabidopsis thaliana histone H4 gene (Chaboute et al., Plant Mol. Biol. 8, 179-191 , 1987), the ubiquitin promoters (Holtorf et al., 1995, Plant Mol. Biol.
  • Rubisco ribulose-biscarboxylase/oxygenase
  • inducible promoters include promoters regulated by application of chemical compounds, including alcohol-regulated promoters (see e.g. EP637339), tetracycline regulated promoters (see e.g. US 5464758), steroid- regulated promoters (see e.g. US5512483; US6063985; US6784340; US6379945; W001/62780), metal-regulated promoters (see e.g. US4601978) but also developmental ⁇ regulated promoters.
  • alcohol-regulated promoters see e.g. EP637339
  • tetracycline regulated promoters see e.g. US 5464758
  • steroid- regulated promoters see e.g. US5512483; US6063985; US6784340; US6379945; W001/62780
  • metal-regulated promoters see e.g. US4601978 but also developmental ⁇ regulated promoters.
  • Pollen/microspore-active promoters include e.g. a maize pollen specific promoter (see, e.g., Guerrero (1990) Mol. Gen. Genet. 224:161 168), PTA29, PTA26 and PTAI 3 (e.g., see U.S. Pat. No. 5,792,929) and as described in e.g. Baerson et al. (1994 Plant Mol. Biol. 26: 1947-1959), the NMT19 microspore-specific promoter as e.g. described in W097/30166. Further anther/pollen-specific or anther/pollen-active promoters are described in e.g.
  • Khurana et al. 2012 (Critical Reviews in Plant Sciences, 31 : 359-390), W02005100575, WO 2008037436.
  • Other suitable promoters are e.g the barley vrn1 promoter, such as described in Alonso-Peral et al. (2001 , PLoS One. 2011 ;6(12):e29456).
  • tissue specific promoters include meristem specific promoters such as the rice OSH1 promoter (Sato et al. (1996) Proc. Natl. Acad. Sci. USA 93:8117-8122) rice metallothein promoter (BAD87835.1) WAK1 and WAK2 promoters (Wagner & Kohorn (2001 ) Plant Cell 13(2): 303-318, spike tissue specific promoter D5 from barley (US6291666), the lemma/palea specific Lem2 promoter from barley (Abebe et al. (2005) Planta, 221 , 170-183), the early inflorescence specific Pvrnl promoter from barley (Alonse Peral et al.
  • nucleic acids and polypeptides can be used to identify further functional restorer genes for wheat G-type cytoplasmic male sterility.
  • the invention also provides the use of the isolated or modified nucleic acids or polypeptides as disclosed herein, such as SEQ ID: 4, to identify one or more further functional restorer genes for wheat G-type cytoplasmic male sterility.
  • homologous or substantially identical functional restorer genes can be identified using methods known in the art. Homologous nucleotide sequence may be identified and isolated by hybridization under stringent or high stringent conditions using as probes a nucleic acid comprising e.g. the nucleotide sequence of SEQ ID NO: 4 or part thereof, as described herein. Other sequences encoding functional restorer genes may also be obtained by DNA amplification using oligonucleotides specific for genes encoding functional restorer genes as primers, such as but not limited to oligonucleotides comprising or consisting of about 20 to about 50 consecutive nucleotides from SEQ ID NO: 4 or its complement. Homologous or substantially identical functional restorer genes can be identified in silico using Basic Local Alignment Search Tool (BLAST) homology search with the nucleotide or amino acid sequences as provided herein.
  • BLAST Basic Local Alignment Search Tool
  • restorer genes or alleles thereof can be validated for example by providing, e.g. by transformation or crossing, such a restorer gene under control of a plant-expressible promoter in a cereal (wheat) plant that does not have the capacity to restore fertility of offspring of a G-type cytoplasmic male sterile wheat plant, crossing the thus generated cereal plant with a G-type cytoplasmic male sterile wheat plant and evaluating seed set in the progeny.
  • a restorer line can be transformed with an RNAi construct or gene-edited with e.g.
  • CRISPR-Cas technology or any other sequence specific nuclease to generate a loss of function variant that renders the plant nonrestoring.
  • other means for mutating the restorer gene e.g. EMS, g-radiation
  • EMS g-radiation
  • the plant may comprise or may be selected to comprise or may be provided with a further functional restorer gene for wheat G-type cytoplasmic male sterility (located on or obtainable from the same or another chromosome), such as Rf2 (ID), Rb (1 B), Rf4 (6B), Rf5 (6D), Ri 6 (5D), Rfl (7B), Rf8, 6AS or 6BS (Tahir & Tsunewaki, 1969, supra; Yen et al., 1969, supra; Bahl & Maan, 1973, supra; Du et al., 1991 , supra; Sihna et al., 2013, supra; Ma et al., 1991 , supra; Zhou et al., 2005, supra).
  • a further functional restorer gene for wheat G-type cytoplasmic male sterility located on or obtainable from the same or another chromosome
  • a further functional restorer gene for wheat G-type cytoplasmic male sterility located on or obtainable from the same
  • any of the herein described methods, markers and marker alleles, nucleic acids, polypeptides, chimeric genes, plants may also be used to restore fertility against S ype cytoplasm, as e.g. described in Ahmed et al 2001 (supra).
  • the methods, nucleic acids, polypeptides, chimeric genes may also be useful to restore fertility against other male-sterility inducing germplasm in wheat or other cereals.
  • a“chimeric gene” refers to a nucleic acid construct which is not normally found in a plant species.
  • a chimeric nucleic acid construct can be DNA or RNA.
  • “Chimeric DNA construct” and“chimeric gene” are used interchangeably to denote a gene in which the promoter or one or more other regulatory regions, such as a transcription termination and polyadenylation region of the gene are not associated in nature with part or all of the transcribed DNA region, or a gene which is present in a locus in the plant genome in which it does not occur naturally or present in a plant in which it does not naturally occur.
  • the gene and the operably-linked regulatory region or the gene and the genomic locus or the gene and the plant are heterologous with respect to each other, i.e. they do not naturally occur together.
  • a first nucleotide sequence is“operably linked" with a second nucleic acid sequence when the first nucleic acid sequence is in a functional relationship with the second nucleic acid sequence.
  • a promoter is operably linked to a coding sequence if the promoter affects the transcription or expression of the coding sequence.
  • operably linked nucleic acid sequences are generally contiguous, and, where necessary to join two proteincoding regions, in the same reading frame (e.g., in a polycistronic ORF). Flowever, nucleic acids need not be contiguous to be operably linked.
  • “Backcrossing” refers to a breeding method by which a (single) trait, such as fertility restoration (Rf), can be transferred from one genetic background (a“donor”) into another genetic background (also referred to as“recurrent parent”), e.g. a plant not comprising such an Rf gene or locus.
  • An offspring of a cross e.g. an F1 plant obtained by crossing an Rf containing with an Rf lacking plant; or an F2 plant or F3 plant, etc., obtained from selfing the F1 is“backcrossed” to the parent.
  • BC1 , BC2, etc. repeated backcrossing
  • BC1S1 , BC2S1 , etc. optionally selfings
  • “Marker assisted selection” or“MAS” is a process of using the presence of molecular markers, which are genetically linked to a particular locus or to a particular chromosome region (e.g. introgression fragment), to select plants for the presence of the specific locus or region (introgression fragment).
  • a molecular marker genetically and physically linked to an Rf locus can be used to detect and/or select plants comprising the Rf locus. The closer the genetic linkage of the molecular marker to the locus, the less likely it is that the marker is dissociated from the locus through meiotic recombination.
  • A“biological sample” can be a plant or part of a plant such as a plant tissue or a plant cell or an extract of a plant or part of a plant, including protein.
  • “Providing genomic DNA” as used herein refers to providing a sample comprising genomic DNA from the plant.
  • the sample can refer to a tissue sample which has been obtained from said plant, such as, for example, a leaf sample, comprising genomic DNA from said plant.
  • the sample can further refer to genomic DNA which is obtained from a tissue sample, such as genomic DNA which has been obtained from a tissue, such as a leaf sample.
  • Providing genomic DNA can include, but does not need to include, purification of genomic DNA from the tissue sample.
  • Providing genomic DNA thus also includes obtaining tissue material from a plant or larger piece of tissue and preparing a crude extract or lysate therefrom.
  • Isolated DNA or“isolated nucleic acid” as used herein refers to DNA or nucleic acid not occurring in its natural genomic context, irrespective of its length and sequence.
  • Isolated DNA can, for example, refer to DNA which is physically separated from the genomic context, such as a fragment of genomic DNA.
  • Isolated DNA can also be an artificially produced DNA, such as a chemically synthesized DNA, or such as DNA produced via amplification reactions, such as polymerase chain reaction (PCR) well-known in the art.
  • Isolated DNA can further refer to DNA present in a context of DNA in which it does not occur naturally.
  • isolated DNA can refer to a piece of DNA present in a plasmid.
  • the isolated DNA can refer to a piece of DNA present in another chromosomal context than the context in which it occurs naturally, such as for example at another position in the genome than the natural position, in the genome of another species than the species in which it occurs naturally, or in an artificial chromosome.
  • a protein also includes a protein (sequence) that has been modified by man (e.g., by modifying the nucleic acid encoding that protein) as is done in an effort to obtain some improvement of protein activity (such as restoration activity).
  • “Isolated”, as used herein, when referring to a nucleic acid (sequence) also includes a nucleic acid (sequence) that has been modified by man (e.g., by inserting, deleting or substituting one or more nucleotides in the native nucleic acid) as is done in an effort to obtain some improvement (like improvement in RNA or protein expression, targeting or stability, or improvement in protein activity
  • A“modified” nucleic acid or protein refers to a nucleic acid or protein (sequence) that is different to the native nucleic acid or protein, by modifying or mutating the nucleic acid or protein (or the nucleic acid encoding the protein), as is done in an effort to obtain some improvement.
  • a“plant” or“plants” according to the invention is made, it is understood that also plant parts (cells, tissues or organs, seed pods, seeds, severed parts such as roots, leaves, flowers, pollen, etc.), progeny of the plants which retain the distinguishing characteristics of the parents (especially the restoring capacity), such as seed obtained by selfing or crossing, e.g. hybrid seed (obtained by crossing two inbred parental lines), hybrid plants and plant parts derived there from are encompassed herein, unless otherwise indicated.
  • the plant cells of the invention may be non-propagating cells.
  • the obtained plants according to the invention can be used in a conventional breeding scheme to produce more plants with the same characteristics or to introduce the characteristic of the presence of the restorer gene according to the invention in other varieties of the same or related plant species, or in hybrid plants.
  • the obtained plants can further be used for creating propagating material.
  • Plants according to the invention can further be used to produce gametes, seeds, flour, embryos, either zygotic or somatic, progeny or hybrids of plants obtained by methods of the invention. Seeds obtained from the plants according to the invention are also encompassed by the invention.
  • Creating propagating material relates to any means known in the art to produce further plants, plant parts or seeds and includes inter alia vegetative reproduction methods (e.g. air or ground layering, division, (bud) grafting, micropropagation, stolons or runners, storage organs such as bulbs, corms, tubers and rhizomes, striking or cutting, twin-scaling), sexual reproduction (crossing with another plant) and asexual reproduction (e.g. apomixis, somatic hybridization).
  • vegetative reproduction methods e.g. air or ground layering, division, (bud) grafting, micropropagation, stolons or runners, storage organs such as bulbs, corms, tubers and rhizomes, striking or cutting, twin-scaling
  • sexual reproduction crossing with another plant
  • asexual reproduction e.g. apomixis, somatic hybridization
  • T ransformation means introducing a nucleotide sequence into a plant in a manner to cause stable or transient expression of the sequence. Transformation and regeneration of both monocotyledonous and dicotyledonous plant cells is now routine, and the selection of the most appropriate transformation technique will be determined by the practitioner. The choice of method will vary with the type of plant to be transformed; those skilled in the art will recognize the suitability of particular methods for given plant types.
  • Suitable methods can include but are not limited to: electroporation of plant protoplasts; liposome-mediated transformation; polyethylene glycol (PEG) mediated transformation; transformation using viruses; micro-injection of plant cells; micro-projectile bombardment of plant cells; vacuum infiltration; and Ag robacteri u m-med iated transformation .
  • the term“homologous” or“substantially identical” or“substantially similar” may refer to nucleotide sequences that are more than 85% identical.
  • a substantially identical nucleotide sequence may be 85.5%; 86%; 87%; 88%; 89%; 90%; 91 %; 92%; 93%; 94%; 95%; 96%; 97%; 98%; 99% or 99.5% identical to the reference sequence.
  • a probe may also be a nucleic acid molecule that is“specifically hybridizable” or“specifically complementary” to an exact copy of the marker to be detected (“DNA target”).“Specifically hybridizable” or“specifically complementary” are terms that indicate a sufficient degree of complementarity such that stable and specific binding occurs between the nucleic acid molecule and the DNA target.
  • a nucleic acid molecule need not be 100% complementary to its target sequence to be specifically hybridizable.
  • a nucleic acid molecule is specifically hybridizable when there is a sufficient degree of complementarity to avoid non-specific binding of the nucleic acid to non-target sequences under conditions where specific binding is desired, for example, under stringent hybridization conditions, preferably highly stringent conditions.
  • Stringent hybridization conditions can be used to identify nucleotide sequences, which are substantially identical to a given nucleotide sequence. Stringent conditions are sequence dependent and will be different in different circumstances. Generally, stringent conditions are selected to be about 5°C lower than the thermal melting point (T m ) for the specific sequences at a defined ionic strength and pH. The T m is the temperature (under defined ionic strength and pH) at which 50% of the target sequence hybridizes to a perfectly matched probe. Typically stringent conditions will be chosen in which the salt concentration is about 0.02 molar at pH 7 and the temperature is at least 60°C. Lowering the salt concentration and/or increasing the temperature increases stringency. Stringent conditions for RNA-DNA hybridizations (Northern blots using a probe of e.g. 10Ont) are for example those which include at least one wash in 0.2X SSC at 63°C for 20min, or equivalent conditions.
  • “High stringency conditions” can be provided, for example, by hybridization at 65°C in an aqueous solution containing 6x SSC (20x SSC contains 3.0 M NaCI, 0.3 M Na-citrate, pH 7.0), 5x Denhardt's (100X Denhardt’s contains 2% Ficoll, 2% Polyvinyl pyrollidone, 2% Bovine Serum Albumin), 0.5% sodium dodecyl sulphate (SDS), and 20 m9/ihI denaturated carrier DNA (single-stranded fish sperm DNA, with an average length of 120 - 3000 nucleotides) as nonspecific competitor. Following hybridization, high stringency washing may be done in several steps, with a final wash (about 30 min) at the hybridization temperature in 0.2-0.1 * SSC, 0.1% SDS.
  • Moderate stringency conditions refers to conditions equivalent to hybridization in the above described solution but at about 60-62°C. Moderate stringency washing may be done at the hybridization temperature in 1x SSC, 0.1% SDS.
  • Low stringency refers to conditions equivalent to hybridization in the above described solution at about 50-52°C. Low stringency washing may be done at the hybridization temperature in 2x SSC, 0.1% SDS. See also Sambrook et al. (1989, Molecular Cloning: A Laboratory Manual, Second Edition, Cold Spring Harbor Laboratory Press, NY) and Sambrook and Russell (2001 , Molecular Cloning: A Laboratory Manual, Third Edition, Cold Spring Harbor Laboratory Press, NY).
  • sequence identity of two related nucleotide or amino acid sequences, expressed as a percentage, refers to the number of positions in the two optimally aligned sequences which have identical residues (x100) divided by the number of positions compared.
  • a gap i.e., a position in an alignment where a residue is present in one sequence but not in the other, is regarded as a position with non-identical residues.
  • RNA For nucleotides the default scoring matrix used is EDNAFULL and for proteins the default scoring matrix is EBLOSUM62. It will be clear that whenever nucleotide sequences of RNA molecules are defined by reference to nucleotide sequence of corresponding DNA molecules, the thymine (T) in the nucleotide sequence should be replaced by uracil (U). Whether reference is made to RNA or DNA molecules will be clear from the context of the application.
  • nucleic acid or protein comprising a sequence of nucleotides or amino acids
  • a chimeric gene comprising a nucleic acid which is functionally or structurally defined, may comprise additional DNA regions etc.
  • exogenous means having an external origin or cause, as opposed to“endogenous”.
  • An exogenous nucleic acid molecule is a nucleic acid molecule that does not naturally occur within the organism and has been (historically) introduced or engineered to occur in an organism.
  • plants according to the invention which however have been obtained exclusively by essentially biological processes, wherein a process for the production of plants is considered essentially biological if it consists entirely of natural phenomena such as crossing or selection, may be excluded from patentability. Plants according to the invention thus also encompass those plants not exclusively obtained by essentially biological processes.
  • SEQ ID NO: 1 sequence of the genomic region from PI 583676 comprising the Rf1-PPR- 07 gene
  • Nt 1-2004 genomic region upstream of cDNA/mRNA transcript of Rf1-PPR- 07
  • Nt 6480-7929 genomic region downstream of cDNA/mRNA transcript of Rfl-PPR- 07
  • SEQ ID NO: 2 ORF256 nucleotide sequence
  • SEQ ID NO: 3 predicted target sequence within ORF256
  • SEQ ID NO: 4 cDNA / mRNA Rf1-PPR- 07
  • SEQ ID NO: 5 amino acid sequence Rf1-PPR- 07
  • SEQ ID NO: 6 Forward primer (Examples 4/5)
  • SEQ ID NO: 7 Reverse primer (Examples 4/5)
  • SEQ ID NO: 8 Probe (Example 4)
  • SEQ ID NO: 9 T-DNA vector comprising RF1-PPR-07 encoding sequence under control of CaMV35S promoter
  • SEQ ID NO: 10 T-DNA vector comprising RF1-PPR-07 encoding sequence under control of Ubiquitin promoter
  • SEQ ID NO: 11 T-DNA vector comprising RF1-PPR-07 encoding sequence under control of Vrn1 promoter
  • a genetic map with total of 2080 SNP markers was established and covered all chromosomes of the wheat genome.
  • the chromosome 1A was described by 108 SNP markers.
  • QTL analysis was carried out using Haley-Knott regression to test the effect of variation in seed set across all markers. An interval of significantly associated markers was delineated, including left and right flanking markers (SEQ ID NO. 2 and SEQ ID NO.
  • the marker with the highest significance and biggest effect on restoration is the peak marker of SEQ ID NO. 3 of WO2017158126. This delimited the interval to 15.6 cM by the left and right flanking markers.
  • 40 F2 individuals that were heterozygous in the QTL region were selected based on phenotype and genotype. A total of 2560 individual F3 plants were grown in the field at 2 locations. For each plant, seed set on the main head under a bag was measured. Additional SNP assays were developed to increase the marker density in the QTL interval. A total of 361 additional SNP markers were using in mapping the 1A region.
  • the Rf1 locus could be further delimited to a region of about 1.9 cM (from 30.9 to 32.8 cM along chromosome 1A).
  • a BAC library was constructed for the wheat restorer line referred to as Rf line‘PI 583676’, by digesting high- molecular weight‘PI 583676’ gDNA with a restriction enzyme and transforming the resultant fragments (mean insert size ⁇ 80 - 130 Kb), into E. coli.
  • The‘PI 583676’ BAC library was screened multiple times using PCR markers developed from fine-mapping markers, reference genomes or isolated BAC sequences. These BACs were sequenced individually. The sequenced BACs were found to contain the RH-PPR-07 gene herein described. These BACs represent the unique‘PI 583676’ genome sequence for the Rf1 QTL region.
  • SEQ ID NO: 1 represents the genomic DNA sequence comprising the Rf1-PPR-07 gene.
  • Rf-PPRs are members of the P-class of PPR proteins, and contain up to ⁇ 30 PPR motifs per protein, with each motif comprising 35 amino acids (Gaborieau, Brown, and Mireau 2016, Front. Plant Sci. 7, 1816).
  • Structurally PPR proteins consist of 2 a-helices that form a hairpin and a super-groove, and it is this super groove that interacts with an RNA molecule.
  • the amino acid composition of the individual PPR motifs determines RNA which nucleotide is recognized, and the number of PPR motifs determines the length of the RNA sequence on the target transcript.
  • the Rf1-PPR-07 was annotated to identify PPR motifs and other sequence features and the results summarized in fig.1 B and C.
  • RH-PPR-07 consists of 741 amino acids and contains 17 consecutive 35 amino-acid PPR motifs, and a predicted transit peptide that targets the protein to the mitochondria (SEQ ID NO: 5). This is very similar to the structure of the Rf-1 A gene cloned from rice, which is 791 amino acids long and contains 16 Rf-PPR repeats (Akagi et al. 2004, Theor. Appl. Genet. 108, 1449-1457; Komori et al. 2004, Plant J. 37, 315-325).
  • Each PPR motif consists of 2 antiparallel helices that form a hairpin structure that interacts with a single stranded RNA molecule.
  • Studies have demonstrated the existence of a recognition code linking the identity of specific amino acids within the repeats and the target RNA sequence of the PPR protein studied (Barkan et al. 2012, supra; Yagi et al. 2013, supra). (Barkan and Small 2014, supra).
  • the identity of the 2nd, 5th and the 35th amino acids of each motif have been shown to be particularly important.
  • the target transcript sequence for Rfl-PPR-07 protein can be predicted using a probability matrix table as described by Yagi et al 2013, supra.
  • the predicted RNA target sequence on orf256 comprises ATTTCTCAAATAAAAA (SEQ ID No. 3), which can be found in the orf256 mRNA as the 16 nucleotides immediately upstream of the ATG start codon of orf256.
  • progenies were genotyped using fine-mapping markers, phenotyped for fertility traits, and classified as either non-restoring, or homozygous for the Rf1 locus. Three individual biological replicates were prepared per tissue type per genotype. qRT-PCR analyses
  • RNAseq and qPCR experiments were performed on developmental spikes at 3 stages from six NIL pairs and also the respective parental lines. Bioinformatic analysis of the RNAseq data allowed the identification of differentially expressed transcripts between restorer and non-restorer genotypes. The identified transcripts mapped into the QTL regions, had the correct (restoring) founder line.
  • a mutagenized population of the restorer line is constructed by EMS mutagenesis. Based on sequencing of the region around the Rf1-PPR-07 gene, mutant plants with an inactivating mutation in the Rf1-PPR-07 gene are identified. The homozygous mutant plants and their wildtype segregants are screened for fertility restoration capacity. The plants that have an inactivating mutant Rf1-PPR-07 gene no longer has restoring ability, confirming that the identified Rf1-PPR-07 gene is a functional Rf gene.
  • the coding sequence of the RH-PPR-07 gene has been cloned under the control of a constitutive UBIQUITIN promoter (e.g. pUbiZm from maize), or under the control of a constitutive cauliflower mosaic virus promoter (p35S), or under the control of a vernalisation-related barley promoter (pvrnl), in a T-DNA expression vector comprising a selectable marker, such as the bar gene. Details for the different T-DNA vectors are provided in the Sequence Listing (SEQ ID NO: 9, SEQ ID NO: 10 and SEQ ID NO: 11).
  • the resulting vectors have been used to transform a wheat line having no restoration capacity such as the transformable variety Fielder according to methods well known in the art for wheat transformation (see e.g.lshida et al Methods Mol Biol. 2015;1223:189-98).
  • the copy number of the transgene in the transgenic plant can be determined by real time PCR on the selectable marker gene.
  • the transformed plants comprising the Rf1-PPR-07 gene cassette, preferably in single copy, were transferred to the greenhouse. Expression of the transgene in leaf tissue and in young developing spikes is tested by qRT-PCR.
  • Transgenic TO plants expressing RH-PPR-07 gene were crossed as male parents to a G-type cytoplasmic male sterile wheat line. F1 progeny of the crosses contain the G- type cytoplasm and show partial or complete restoration of male fertility due to the presence of the RH-PPR-07 gene.
  • the level of restoration in F1 progeny is tested using four different assays.
  • the mitochondrial ORF256 protein is quantified on Western blot using polyclonal antibodies raised against synthetic ORF256 protein.
  • Expression of the RH-PPR-07 gene leads to reduced accumulation of the ORF256 protein.
  • pollen accumulation and pollen viability is quantified using the AmphaZ30 device.
  • Expression of the RH-PPR-07 gene leads to higher numbers of viable pollen.
  • the integrity of anther tissues is inspected microscopically. Expression of the RH-PPR-07 gene leads to better preservation of functional tapetum layer.
  • seed set per ear from self-pollination is quantified.
  • Guide RNAs for CRISPR-mediated gene editing targeting the mRNA coding sequence preferably the protein coding sequence of the RH-PPR-07 gene, or the immediately upstream promoter sequence of the RH-PPR-07 gene are designed by using e.g. the CAS-finder tool.
  • Preferably four unique or near-unique guide RNAs are designed per target gene.
  • the guide RNAs are tested for targeting efficiency by PEG-mediated transient co-delivery of the gRNA expression vector with an expression vector for the respective nuclease, e.g.
  • Genomic DNA is extracted from the protoplasts after delivery of the guide RNA and nuclease vectors. After PCR amplification, integrity of the targeted RH-PPR-07 gene sequence is assessed by sequencing.
  • the one or two most efficient guide RNAs are used for stable gene editing in same wheat restorer line also containing the G-type CMS cytoplasm.
  • the selected guide RNA expression vector together with a nuclease expression module and a selectable marker gene, are introduced into embryos isolated from the before mentioned wheat restorer line using e.g. particle gun bombardment.
  • Transgenic plants showing resistance to the selection agent are regenerated using methods known to those skilled in the art.
  • Transgenic TO plants containing gene targeting events, preferably small deletions resulting in a non-functional RH-PPR-07 gene are identified by PCR amplification and sequencing.
  • Transgenic TO plants containing the G-type CMS cytoplasm and likely to contain a functional knock-out of the Rf1- PPR-07 gene, preferably in homozygous state, but alternatively in heterozygous state, are crossed as female parents to a spring wheat line with normal cytoplasm and without PPR-Rf genes.
  • the F1 progeny of the crosses contains the G-type “CMS” cytoplasm and 50% (in case of heterozygous TO) or 100% (in case of homozygous TO) of the F1 progeny will lack a functional version of the target Rf-PPR gene.
  • the F1 plants lacking a functional target Rf-PPR gene are identified using genomic PCR assays.
  • the F1 plants show partial or complete loss of male fertility due to the knock-out of the RH-PPR-07 gene.
  • the level of male fertility in the F1 progeny lacking a functional version of the RH-PPR-07 gene is tested using four different assays.
  • the mitochondrial ORF256 protein is quantified on Western blot using polyclonal antibodies raised against synthetic ORF256 protein.
  • the knock-out of the RH-PPR-07 gene leads to increased accumulation of the ORF256 protein.
  • pollen accumulation and pollen viability is quantified using the AmphaZ30 device or by iodine staining.
  • the knock-out of the RH-PPR-07 gene leads to lower numbers of viable pollen.
  • the integrity of anther tissues is inspected microscopically.
  • the knock-out of the RH-PPR-07 gene leads to early deterioration of the tapetum layer.
  • seed set per ear from self-pollination is quantified.
  • the knockout of the RH-PPR-07 gene leads to reduced number of grains per ear.
  • the F1 progeny from crosses of non- edited Rf plants to the same spring wheat line serve as a control.
  • guide RNAs for CRISPR-mediated gene editing targeting the promoter region comprised within the nucleotide sequence of SEQ ID NO: 1 from nucleotide position 1 to 2000 are designed and tested in wheat protoplasts of a wheat line of interest in the manner described above.
  • the one or two most efficient guide RNAs are used for stable gene editing in same wheat line as described above, but additionally repair DNA comprising the substation, insertion or deletion of interest (one or more nucleotides) between flanking sequences homologous to the target DNA are also introduced.
  • Plants comprising the edited upstream region are identified by PCR amplification and sequencing and tested for the level of male fertility as described above. Background References

Abstract

L'invention concerne des procédés de sélection ou de production d'une plante céréalière comprenant un gène de restauration fonctionnel pour la stérilité mâle cytoplasmique de type G du blé, et des acides nucléiques et/ou des polypeptides destinés à être utilisés dans le cadre de ces procédés.
PCT/EP2019/063479 2018-05-25 2019-05-24 Plantes comprenant des gènes de restauration de la stérilité mâle cytoplasmique de type g du blé, et leurs utilisations WO2019224359A1 (fr)

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CN112175970A (zh) * 2020-10-26 2021-01-05 河南农业大学 恢复玉米C型胞质育性的基因Rf5及其应用

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