WO2021193865A1 - 温度感受性雄性不稔植物の製造方法 - Google Patents
温度感受性雄性不稔植物の製造方法 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
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- 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
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- 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
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- 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
- C12N15/10—Processes for the isolation, preparation or purification of DNA or RNA
- C12N15/102—Mutagenizing nucleic acids
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- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/74—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora
- C12N15/743—Vectors or expression systems specially adapted for prokaryotic hosts other than E. coli, e.g. Lactobacillus, Micromonospora for Agrobacterium; Rhizobium; Bradyrhizobium
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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Definitions
- the present invention relates to a method for producing a temperature-sensitive male sterile plant and the plant obtained thereby.
- the present invention also relates to a method for producing a hybrid seed using the plant, and the seed obtained thereby.
- heterosis which is more vigorous in growth and higher yield and quality than the parent varieties, can be obtained. Furthermore, the merit of hybrid breeding is great, such as the ability to accumulate useful traits from disease resistance genes and the like. In vegetables, flowers, corn, etc., almost all commonly used varieties are hybrid varieties. Hybrid varieties are also widespread in rice cultivation in China and the United States.
- hybrid varieties are one-generation varieties
- a large amount of mating work is required for each seed production, and at present, the labor, time, and cost required for mating are bottlenecks.
- either manual removal of stamens (male removal work) or pre-cultivation of a special male sterile line is used to remove pollen. ..
- manual sterilization and mating are carried out in hybrid seed production. If male sterile strains can be used, reduction of male removal work can be expected.
- the main production method of hybrid seeds using the male sterile line is called the three-line method, and there are three lines: the fertility recovery line that is the father, the male sterile line that is the mother, and the maintenance line. It is necessary (see Fig. 1). It is complicated and time-consuming because it requires special breeding for the excellent varieties to be used in order to have male sterility and traits of fertility recovery commensurate with it. Beyond that, there are only a limited combination of available cytoplasmic male sterility factors and matching fertility recovery factors, which is laborious and time consuming due to the need to introduce those factors by cross breeding. As a result, it hinders the use of a wide range of genetic resources.
- Patent Document 1 Non-Patent Document 1
- the responsible gene involved in the phenotype of this mutant has not yet been identified. Therefore, it has been difficult to produce such a temperature-sensitive male sterile line in varieties other than "Reimei” and plant species other than rice, and to produce hybrid seeds by the two-line method.
- the present invention has been made in view of the above problems, and provides a method for producing a conditional male sterile plant that targets the gene responsible for identifying the responsible gene involved in the temperature-sensitive male sterile trait in "PL12".
- the purpose is to do.
- the present inventors first performed fine mapping in order to achieve the above object. However, the range could not be narrowed from about 1.8 Mb near 54 cM on chromosome 7. Therefore, whole genome sequence analysis of the original varieties "Reimei” and "PL12” was performed, and both were compared. As a result, it was found that there was a deletion of about 150 kb in the region of about 1.8 Mb of "PL12".
- a deletion region of about 150 kb was divided into about three equal parts, and a strain in which each of these three regions was deleted was created by a genome editing method. As a result, it was found that one of these showed the same phenotype as "PL12", and the candidate area was narrowed down. Further, in the same manner, the candidate region was divided into three, a strain in which each of these three regions was deleted was created, and the range in which the responsible mutation exists was successfully narrowed down to about 10 kb.
- the present invention provides the following.
- the present invention relates to a method for producing a temperature-sensitive male sterile plant, and the plant obtained thereby. Further, the present invention provides, more specifically, the following with respect to the method for producing a hybrid seed using the plant and the seed obtained by the method.
- a method for producing a temperature-sensitive male sterile plant which comprises a step of artificially suppressing the function of at least one gene selected from the group consisting of the following (a) to (d).
- SEQ ID NO: A gene containing a DNA consisting of a nucleotide sequence encoding the amino acid sequence according to any one of 1 to 22 and a DNA that hybridizes under stringent conditions.
- ⁇ 3> A method for producing hybrid seeds. The step of cross-pollinating the temperature-sensitive male-sterile plant according to ⁇ 2>, which has been cultivated under a temperature limit and made male-sterile, with any plant, and collecting seeds from the temperature-sensitive male-sterile plant. The process, How to include.
- ⁇ 4> A hybrid seed cultivated under a temperature limit and made male sterile, with the temperature-sensitive male sterile plant according to ⁇ 2> as the mother plant and any plant as the father plant.
- a temperature-sensitive sterile plant it is possible to produce a temperature-sensitive sterile plant.
- a temperature-sensitive sterile plant can be produced without requiring special breeding other than suppressing the function of the temperature-sensitive male sterile gene of the present invention.
- the amino acid sequence of the protein encoded by the temperature-sensitive male sterile gene of the present invention is highly conserved. Since this gene is also present in the order Amborella, which is the most primitive angiosperm, it can be seen that it is at least a gene commonly present in angiosperms. Therefore, in principle, it is considered that this gene can be used in all crops. As described above, since the line used in the method of the present invention is not limited, it is possible to produce a male sterile line by suppressing the function of this gene in various varieties and lines of various plant species.
- Strains lacking the gene in "Nihonbare” by genome editing show a temperature-sensitive male sterile phenotype similar to "PL12". It is a photograph which shows the appearance (typical example) of the genome editing line of rice. Strains lacking gene function by genome editing of rice variety "Nihonbare” were cultivated at 28 ° C (left) and 33 ° C (right). At 28 ° C, the ears were normally fertilized and the ears were dripping, whereas at 33 ° C, the ears were standing because they were not fertile. It is a photograph which shows the appearance (typical example) of the genome editing line, etc. of each of "Nihonbare” and "Hokuriku 193".
- the genome editing line derived from “Hokuriku 193” Similar to the genome editing line derived from “Nihonbare", the genome editing line derived from “Hokuriku 193” also forms pollen and develops anthers under normal conditions, but becomes male sterile due to pollen hypoplasia under high temperature conditions.
- TMS2 means the temperature-sensitive male sterile gene of the present invention (see SEQ ID NOs: 43 and 44).
- SEQ ID NOs: 45 and 46 deletion of 2 amino acids at the relevant site occurs (see SEQ ID NOs: 45 and 46), but it is thought that functional proteins are still formed, which is different from the wild type in seed formation. Can not be seen.
- SEQ ID NOs: 47 and 48 it was shown that seeds could not be produced under high temperature conditions in strains having a 5-base deletion mutation (see SEQ ID NOs: 47 and 48), which is presumed to be deficient in protein function due to frame shift.
- FIG. 1 It is a schematic diagram showing the amino acid sequence encoded by the temperature-sensitive male sterile gene derived from each of rice, tomato and Arabidopsis thaliana, and the mutation site in the genome-edited individual prepared in the examples described later.
- (i) and (ii) indicate the mutation introduction site in rice (position where double chain cleavage was introduced in CRISPR / Cas9)
- (iii) indicate the mutation introduction site in Arabidopsis thaliana
- (iv) and (V) shows the mutation introduction site in tomato.
- the present inventors have clarified the responsible gene involved in the phenotype of the temperature-sensitive male sterile strain "Paddy rice intermediate mother Honno No. 12" (PL12). Furthermore, in wild-type rice, Arabidopsis thaliana and tomato, we succeeded in imparting a temperature-sensitive male sterility trait to these plants by suppressing the function of the gene by a genome editing method. Therefore, the method for producing a temperature-sensitive male sterile plant of the present invention is characterized by including a step of artificially suppressing the function of the gene (temperature-sensitive male sterile gene), and more specifically, the following is provided. do.
- a method for producing a temperature-sensitive male sterile plant which comprises a step of artificially suppressing the function of at least one gene selected from the group consisting of the following (a) to (d) of the plant (a).
- Gene encoding a protein consisting of the amino acid sequence according to any one of SEQ ID NOs: 1 to 22 (b) One or more amino acids in the amino acid sequence according to any one of SEQ ID NOs: 1 to 22 Gene encoding a protein consisting of a substituted, deleted, added, and / or inserted amino acid sequence (c) SEQ ID NO:: 60% or more homology with the amino acid sequence according to any one of 1 to 22 Gene encoding an amino acid sequence having (d) SEQ ID NO:: A gene containing a DNA consisting of a nucleotide sequence encoding the amino acid sequence according to any one of 1 to 22 and a DNA that hybridizes under stringent conditions.
- temperature-sensitive male sterility means sterility normally when cultivated under the allowable temperature conditions described later, whereas male sterility when cultivated under the temperature limiting conditions described later. It means a fertile trait.
- the "plant" to which the temperature-sensitive male sterility trait is imparted is not particularly limited as long as it is a plant having the temperature-sensitive male sterility gene described later.
- Rice plants such as barley, wheat, sorghum, corn, Higanbana plants such as onion, onion) and dicotyledonous plants (eg, white inuna, hakusai, rapeseed), yaseikanran (cabbage, cauliflower, broccoli, etc.) ), Etc.
- Examples thereof include family plants, basho family plants such as bananas, anthropogenic plants including ambolera family plants (ambolera tricopoda), nude plants, moss plants, and fern plants. Further, it may be a genetically modified organism or a genome editor of these plants (for example, a herbicide-resistant crop, a pest-resistant crop, a disease-resistant crop, a taste-improving crop, a preservation-improving crop, a yield-improving crop).
- Table 1 shows examples of genes encoding typical amino acid sequences derived from each plant species as "temperature-sensitive male sterile genes" whose functions are suppressed in the present invention.
- nucleotide sequence is mutated even in nature. And the amino acid encoded by it can be changed accordingly. Therefore, the amino acid according to any one of SEQ ID NOs: 1 to 22 can be imparted to the temperature-sensitive male sterility gene of the present invention by suppressing its function. Also included is a gene encoding a protein consisting of an amino acid sequence in which one or more amino acids have been substituted, deleted, added, and / or inserted in the sequence.
- plural usually means 50 amino acids or less, preferably 45 amino acids or less, more preferably 40 amino acids or less, still more preferably 35 amino acids or less, more preferably 30 amino acids or less, still more preferably 25 amino acids or less, and more preferably.
- Within 20 amino acids more preferably within 15 amino acids, more preferably within 10 amino acids (eg, within 9 amino acids, within 8 amino acids, within 7 amino acids, within 6 amino acids), particularly preferably within a few amino acids (eg, within 5 amino acids).
- nucleotide sequence information of a specific gene can be used to identify the homologous gene from the same species or other plants when a specific gene is obtained. It is possible.
- Methods for identifying homologous genes include, for example, hybridization techniques (Southern, EM, J. Mol. Biol., 98: 503, 1975) and polymerase chain reaction (PCR) techniques (Saiki, R. et al.). K., et al. Science, 230: 1350-1354, 1985, Saiki, RK et al. Science, 239: 487-491, 1988).
- hybridization reactions are usually performed under stringent conditions.
- 6M urea, 0.4% SDS, 0.5xSSC conditions or equivalent stringency hybridization conditions can be exemplified. Isolation of genes with higher homology can be expected by using conditions with higher stringency, such as 6M urea, 0.4% SDS, and 0.1xSSC.
- the temperature-sensitive male sterility gene of the present invention can be imparted with the trait of temperature-sensitive male sterility by suppressing its function, the amino acid sequence set forth in any of SEQ ID NOs: 1 to 22 can be used.
- a gene containing a DNA consisting of a encoding nucleotide sequence and a DNA that hybridizes under stringent conditions is included.
- the protein encoded by the identified homologous gene usually has high homology (high similarity), preferably high identity with that encoded by the particular gene.
- “high” means at least 40% or more, more preferably 50% or more, still more preferably 60% or more, more preferably 70% or more, still more preferably 80% or more, more preferably 85% or more (for example,). 90% or more, 95% or more, 96% or more, 97% or more, 98% or more, 99% or more).
- the amino acid sequence according to any one of SEQ ID NOs: 1 to 22 can be used.
- a gene encoding an amino acid sequence having 60% or more homology (similarity) or 40% or more identity is included.
- the homology of the amino acid sequence set forth in SEQ ID NO: 1 is 65% (identity is 45%) with respect to the amino acid sequence set forth in SEQ ID NO: 14, and the sequence number for the amino acid sequence set forth in SEQ ID NO: 9 or 44. : 14 has a homology of 73% (identity is 55%).
- Sequence homology can be determined using a BLAST program (Altschul et al. J. Mol. Biol., 215: 403-410, 1990).
- the program is based on the algorithm BLAST (Proc. Natl. Acad. Sci. USA, 87: 2264-2268, 1990, Proc. Natl. Acad. Sci. USA, 90: 5873-5877, 1993) by Karlin and Altschul.
- BLAST Proc. Natl. Acad. Sci. USA, 87: 2264-2268, 1990, Proc. Natl. Acad. Sci. USA, 90: 5873-5877, 1993
- the amino acid sequence is analyzed using the Gapped BLAST program, it can be performed as described in Altschul et al. (Nucleic Acids Res. 25: 3389-3402, 1997).
- BLAST and Gapped BLAST programs use the default parameters of each program. Specific methods of these analysis
- the "artificial suppression of the function of the temperature-sensitive male sterile gene" of the present invention includes both complete suppression (inhibition) and partial suppression of the function.
- the artificial suppression of the activity of the protein encoded by the temperature-sensitive male sterility gene is included. Then, such artificial suppression can be performed, for example, by introducing a mutation into a coding region, a non-coding region, a transcription control region (promoter region), or the like of a temperature-sensitive male sterile gene.
- the mutation introduced into the temperature-sensitive male sterile gene is not particularly limited as long as the function of the gene is suppressed, and examples thereof include nucleotide substitution, deletion, addition, and / or insertion. , Nonsense mutations, frame shift mutations, null mutations are preferred.
- the number of mutations introduced into the temperature-sensitive male sterile gene is not particularly limited as long as the function of the gene is suppressed, and may be one, or a plurality (for example, two, three or less, 5). 10 or less, 20 or less, 30 or less, 40 or less, 50 or less) may be used.
- Such mutations include, for example, as shown in Table 2 below, nucleotide mutations accompanied by alteration or deletion of amino acids (about 33% of the total) after the 53rd position of the amino acid sequence set forth in SEQ ID NO: 1. Can be mentioned.
- nucleotide mutations accompanied by alterations or deletions of amino acids (about 76% of the total) after the 18th or 19th position shown in SEQ ID NO: 14 can be mentioned.
- nucleotide mutations with alterations or deletions of amino acids (about 70% of the total) after the 24th position shown in SEQ ID NO: 9 or 44 can be mentioned. Then, such a deletion suppresses the function of the temperature-sensitive male sterile gene of the present invention, and a temperature-sensitive male sterile plant can be obtained.
- a part of the protein expressed by a gene mutation When a part of the protein expressed by a gene mutation is deleted, usually 10% or more of the amino acids may be changed or deleted, preferably 20% or more, more preferably 25% or more, and more. It is preferably 30% or more, more preferably 35% or more, more preferably 40% or more, still more preferably 45% or more, more preferably 50% or more, still more preferably 55% or more, still more preferably 60% or more, still more preferable. Is 65% or more, more preferably 70% or more, still more preferably 75% or more, more preferably 80% or more, still more preferably 85% or more, still more preferably 90% or more, still more preferably 95% or more (for example, 96). % Or more, 97% or more, 98% or more, 99% or more) may be altered or deleted.
- FIGS. 6 and 7 suggest a region highly conserved in the amino acid sequence encoded by the temperature-sensitive male sterile gene of the present invention, that is, a region important for exerting its function. Therefore, such a storage region is also suitable as a region in which the amino acid sequence is altered or deleted. Examples of the storage region include a region consisting of positions 10 to 75 in the amino acid sequence set forth in SEQ ID NO: 1, or a region corresponding thereto. As shown in FIGS.
- the corresponding regions include nucleotide and amino acid sequence analysis software (GENETYX-MAC, Sequencer, etc.) and BLAST (http://blast.ncbi.nlm.nih.gov/).
- GENETYX-MAC nucleotide and amino acid sequence analysis software
- BLAST http://blast.ncbi.nlm.nih.gov/.
- Introduction of a mutation into a temperature-sensitive male sterile gene can be achieved by a method known to those skilled in the art.
- a genome editing method a physical mutagenesis method, a method using a chemical mutagen, a method of introducing a transposon or the like into genomic DNA, siRNA, antisense RNA, RNA having ribozyme activity, and the like were used.
- a method of targeting transcripts but are not limited to methods of targeting transcripts.
- the genome editing method, the method of targeting a transcript, and the TILLING method described later are preferable from the viewpoint that mutations can be artificially introduced by targeting a temperature-sensitive male sterile gene.
- Genome editing methods utilize site-specific nucleases (eg, zinc finger nucleases (ZFNs), transcriptional activation-like effector nucleases (TALENs), DNA double-strand break enzymes such as CRISPR-Cas9) to target genes.
- ZFNs zinc finger nucleases
- TALENs transcriptional activation-like effector nucleases
- CRISPR-Cas9 DNA double-strand break enzymes
- ZFNs US Patent No. 6265196, 8524500, 7888121, European Patent No. 1720995
- TALENs US Patent No. 8470973, US Patent No. 8586363
- PPR penentatric protein protein
- CRISPR-Cas9 US Patent No. 8697359, International Publication No.
- CRISPR-Cpf1 Zetsche B. et al., Cell, 163 (Zetsche B. et al., Cell, 163) 3): 759-71, (2015)
- Target-AID K. Nishida et al., Targeted nucleotide editing using hybrid prokaryotic and vertebrate advanced CRISPR.
- Etc. a method using a complex of a guide RNA and a protein can be mentioned.
- Examples of the physical mutation introduction method include heavy ion beam (HIB) irradiation, fast neutron beam irradiation, gamma ray irradiation, and ultraviolet irradiation (Hayashi et al., Cyclotrons and Their Applications, 2007, 18th International Conference, 237). See pages 239 and Kazama et al., Plant Biotechnology, 2008, Vol. 25, pp. 113-117).
- HEB heavy ion beam
- Examples of the method using a chemical mutant include a method of treating seeds and the like with a chemical mutant (see Zwar and Chandler, Planta, 1995, Vol. 197, pp. 39-48, etc.).
- the chemical mutagen is not particularly limited, but ethylmethane sulfate (EMS), N-ethyl-N-nitrosourea (ENU), N-methyl-N-nitrosourea (MNU), sodium azide, sodium hydrogen sulfite.
- transposons such as T OS 17, and a method of the T-DNA or the like is inserted into the genomic DNA of a plant (Kumar et al., Trends Plant Sci., 2001 year, 6 Vol. 3, No. 3, pp. 127-134, and Tamara et al., Trends in Plant Science, 1999, Vol. 4, No. 3, pp. 90-96).
- the mutation has been introduced into the temperature-sensitive male sterile gene by a known method.
- known methods include a DNA sequencing method (next-generation sequencing method and the like), a PCR method, an analysis method using a microarray, a Southern blotting method, and a Northern blotting method.
- a DNA sequencing method next-generation sequencing method and the like
- a PCR method an analysis method using a microarray
- a Southern blotting method a Northern blotting method.
- whether or not a mutation has been introduced into a temperature-sensitive male sterile gene can be determined by comparing the sequence or length of the gene before and after the introduction of the mutation.
- transcription of the temperature-sensitive male sterile gene is performed in plants in which mutations have been introduced into the transcription control region, etc. If a decrease in the expression level of the product or translation product is observed, it can be confirmed that the plant is a plant in which a mutation has been introduced into the temperature-sensitive male sterile gene.
- TILLING Targeting Induced Local Lesions IN Genomes
- a non-selective mutation is introduced into the plant genome by using the above-mentioned heavy ion beam irradiation, a chemical mutagen, etc.
- the temperature-sensitive male sterile gene or a part thereof is amplified by PCR and then said.
- Individuals having mutations in the amplification product can be selected by the TILLING or the like.
- the mutation introduced into a gene other than the target gene can be removed.
- a plant in which the function of the temperature-sensitive male sterility gene is suppressed by introducing a mutation into the temperature-sensitive male sterility gene may be a heterozygote of the temperature-sensitive male sterility gene.
- a homozygote having a temperature-sensitive male sterile gene into which the mutation has been introduced can be obtained from the F1 plant.
- the "plant that is a homozygote having the temperature-sensitive male sterility gene into which the mutation has been introduced” contains two alleles of the temperature-sensitive male sterility gene having mutations that are identical to each other.
- the plant having the first mutation but also the first temperature-sensitive male sterile gene encoding the protein having the first mutation and the activity being suppressed, and the second gene encoding the protein having the second mutation and the activity being suppressed. Included are plants with a temperature-sensitive male sterility gene of 2.
- dsRNA double-stranded RNA, which is complementary to the transcript of the temperature-sensitive male sterility gene
- a method using DNA encoding siRNA a method using DNA encoding antisense RNA complementary to a transcript of a temperature-sensitive male sterile gene (antisense DNA), a transcript of a temperature-sensitive male sterile gene
- antisense DNA a method using DNA encoding antisense RNA complementary to a transcript of a temperature-sensitive male sterile gene
- a method of targeting a transcript of a temperature-sensitive male sterile gene such as a method using DNA encoding an RNA having ribozyme activity that specifically cleaves (ribozyme method), can also be mentioned.
- the artificial suppression of the temperature-sensitive male sterile gene function can be performed on various plants, seeds or plant cells according to the above-mentioned methods and the like.
- Plant cells include cultured cells derived from plants as well as cells in the plant body.
- various forms of plant-derived cells such as suspension-cultured cells, protoplasts, leaf sections, callus, immature embryos, pollen and the like are included.
- the above-mentioned site-specific nuclease, fusion protein or DNA encoding a complex of guide RNA and protein, DNA encoding transposon, DNA encoding double-stranded RNA, and antisense RNA are encoded.
- DNA, DNA encoding RNA having ribozyme activity, or the like may be introduced into plant cells in the form of being inserted into a vector.
- the vector into which the DNA for artificially suppressing the function of the temperature-sensitive male sterile gene is inserted is not particularly limited as long as the inserted gene can be expressed in plant cells. It may contain a promoter for constitutive or inducible expression of DNA. Examples of the promoter for constitutive expression include a rice ubiquitin promoter, a cauliflower mosaic virus 35S promoter, a rice actin promoter, and a corn ubiquitin promoter. In addition, it is known that promoters for inducible expression are expressed by external factors such as infection or invasion of filamentous fungi, bacteria, and viruses, low temperature, high temperature, drying, irradiation with ultraviolet rays, and spraying of specific compounds. Examples include promoters that have been used. Further, as a promoter for expressing a DNA encoding a short RNA such as a guide RNA or siRNA as the DNA according to the present invention, a U6 promoter or a polIII-based promoter is preferably used.
- Examples of the method for introducing the DNA or the vector into which the DNA is inserted into a plant cell include a particle gun method, a particle bombardment method, an Agrobacterium-mediated method (Agrobacterium method), a polyethylene glycol method, and electroporation.
- a perforation method electroporation
- electroporation Various methods known to those skilled in the art, such as a perforation method (electroporation), can be used.
- the above-mentioned site-specific nuclease, fusion protein, and transposon can be used as proteins, and the above-mentioned guide RNA, double-stranded RNA, antisense RNA, and RNA having ribozyme activity can be used as RNA.
- RNA double-stranded RNA, antisense RNA, and RNA having ribozyme activity
- a temperature-sensitive male sterile plant can be obtained by regenerating a plant from a plant cell in which the gene function is artificially suppressed by the above-mentioned method or the like.
- a method for producing a transformed plant in rice a method for regenerating a plant by introducing a gene into a protoplast with polyethylene glycol (Datta, SK In Gene Transfer To Plants (Potrykus I and Spangenberg Eds). ) Pp66-74, 1995), a method of introducing a gene into a protoplast by an electric pulse to regenerate a plant (Toki et al. Plant Physiol. 100, 1503-1507, 1992), and a method of directly introducing a gene into a cell by a particle gun method. Then, a method of regenerating a plant (Christou et al.
- a method for regenerating a sorghum plant for example, a method of regenerating a plant by introducing a gene into an immature embryo or callus by an agrobacterium method or a particle gun method, or polluting using a pollen gene-introduced by ultrasonic waves.
- the method is preferably used (JA Able et al., In Vitro Cell. Dev. Biol. 37: 341-348, 2001, AM Casas et al., Proc. Natl. Acad. Sci. USA. 90: 11212-11216, 1993, V.
- transformation is performed using the method described in Tabei et al. (Edited by Yutaka Tabei, "Transformation Protocol [Plant Edition]", Kagaku Dojin Co., Ltd., published on September 20, 2012). And can be regenerated into plants.
- thermosensitive male sterile plants and their use By the above-mentioned method or the like, a temperature-sensitive male sterile plant in which the function of the temperature-sensitive male sterile gene of the present invention is artificially suppressed can be obtained. Therefore, the present invention A temperature-sensitive male sterile plant in which the function of at least one gene selected from the group consisting of the following (a) to (d) is artificially suppressed (a) SEQ ID NO: 1 to 22 Gene encoding a protein consisting of the described amino acid sequence (b) SEQ ID NO:: One or more amino acids are substituted, deleted, added, and / or inserted in the amino acid sequence according to any one of 1 to 22.
- SEQ ID NO: A gene encoding an amino acid sequence having 60% or more homology with the amino acid sequence according to any one of 1 to 22
- SEQ ID NO: A gene comprising a DNA consisting of a nucleotide sequence encoding the amino acid sequence according to any one of 1 to 22 and a DNA that hybridizes under stringent conditions is provided.
- the temperature-sensitive male sterility gene, the artificial suppression of its function, and the plants to which the temperature-sensitive male sterility is imparted by the suppression are as described above, but as the temperature-sensitive male sterility plant of the present invention.
- the present invention includes offspring and clones of temperature-sensitive male sterile plants, as well as their reproductive materials.
- the breeding material include seeds, strains, callus, and protoplasts.
- the temperature-sensitive male sterile plant of the present invention can be used in a method for producing hybrid seeds by a two-system method as shown in FIG. Therefore, the present invention
- the temperature-sensitive male sterile plant of the present invention is cultivated under a temperature limit, and the plant in the male sterile state is used.
- “Limited temperature” means a temperature higher than the cultivation temperature (allowable temperature) at which the temperature-sensitive male sterile plant of the present invention can form pollen. Such a limiting temperature and an allowable temperature can be appropriately adjusted by those skilled in the art according to the type of plant and the like.
- Cultivation under the limit temperature may be carried out using a known cultivation method according to the type of plant and the like.
- the cultivation period is not particularly limited as long as it includes the period from flower bud formation (flowering) to pollen formation.
- flower bud means a growth point that has undergone vegetative growth and differentiated into a growth point that undergoes reproductive growth, that is, a primordium of a flower.
- the formation period varies depending on the type of plant, its variety / lineage, cultivation conditions, etc., but can be determined by a person skilled in the art by a known method (for example, visual inspection).
- the cultivation under the limit temperature during this period may be continuous (for example, cultivation under the limit temperature day or night), or intermittently (for example, only during the day under the limit temperature). Cultivation in).
- the "arbitrary plant" to be crossed with the temperature-sensitive male sterile plant of the present invention is not particularly limited as long as it is a plant that maintains male fertility.
- the temperature-sensitive male sterile plant of the present invention can be used. Are of the same species, but different strains or varieties can be mentioned.
- the seed thus obtained is a seed of a F1 hybrid (F1), a so-called hybrid, in which the temperature-sensitive male sterile plant of the present invention is used as the mother (maternal line) and any plant is used as the paternal book (paternal line). It becomes a seed. Therefore, in the present invention A hybrid seed is also provided, which is cultivated under a temperature limit and has a male-sterile, temperature-sensitive male-sterile plant of the present invention as a mother plant and an arbitrary plant as a parent plant.
- F1 hybrid F1 hybrid
- a hybrid seed is also provided, which is cultivated under a temperature limit and has a male-sterile, temperature-sensitive male-sterile plant of the present invention as a mother plant and an arbitrary plant as a parent plant.
- Plant cultivation method Rice was cultivated in pots under the normal cultivation conditions (28 ° C. daytime / 22 ° C. night). Flowering was induced under short-day conditions, and cultivation was continued at 28 ° C./22 ° C. at noon or 33 ° C./22 ° C. at night. Pollen formation was observed at the time of heading, and seed fertility was confirmed.
- Arabidopsis was cultivated in a growth chamber set under continuous light conditions of 21 ° C. After the drawing table, cultivation was continued at 21 ° C. or 27 ° C., and pollen formation and fruiting were observed.
- the CRISPR / Cas9 method commonly used in plants was used. More specifically, a guide RNA, Cas9, and a vector expressing a hygromycin resistance gene as a selection marker were introduced into the callus of the rice variety "Nihonbare" or the immature embryo of "Hokuriku 193" by the Agrobacterium method. ..
- the vector is based on pPZP202 and can express guide RNA and Cas9 under the control of the U6 promoter of rice and the ubiquitin promoter of rice, respectively.
- a regenerated plant was obtained from callus selected for hygromycin resistance, genomic DNA was prepared from the leaves, and the nucleotide sequence of the genome editing part was confirmed. Those with mutations such as single base insertion that shift the codon reading frame were selected. In these mutants, the protein in which this gene functions cannot be expressed, resulting in a gene-deficient state.
- Geno editing of Arabidopsis thaliana Similar to the above rice, genome editing was performed using the CRISPR / Cas9 method. The gene transfer method is different from that of rice. The commonly used floral dip method was used for transformation of Arabidopsis thaliana.
- the temperature-sensitive male sterile paddy rice "PL12" was selected and bred from a mutant population of the cultivar "Reimei” by gamma irradiation.
- pollen is normally formed and bears fruit at a normal cultivation temperature (about 28 ° C.), but pollen hypoplasia occurs at a high temperature (about 33 ° C.) and no fruiting is observed (see FIG. 3).
- no abnormalities were observed in the vegetative organs such as leaves and the pistil, and it is known that the susceptibility period is several days around 20 days before heading.
- Example 1 Fine mapping was performed to identify the responsible mutation of the temperature-sensitive male sterile trait, but the range could not be narrowed from about 1.8 Mb near 54 cM. Therefore, whole genome sequence analysis of the original varieties "Reimei” and "PL12” was performed, and both were compared. As a result, it was found that there was a deletion of about 150 kb in the relevant part of chromosome 7 of "PL12".
- a series of partial deletions was created by introducing double-strand breaks at two locations in the genomic DNA by the CRISPR / Cas9 method using two guide RNAs and removing the DNA fragment between them. More specifically, as shown in FIG. 4, (1) to (2), (2) to (3), (3) to (4) so as to divide the deletion region of about 150 kb into approximately three equal parts. A strain with a partial deletion in the range of) was created. In addition, in order to delete (1) to (2), (2) to (3), and (3) to (4), SEQ ID NOs: 23 and 24, 24 and 25, and 25 and 26 are targeted. Sequenced and CRISPR / Cas9 caused two double chain breaks, respectively.
- # 592 showed the trait of temperature-sensitive male sterility, and it was considered that there was a responsible mutation in the range of about 10 kb from (3) to (5). From the information in the database, it was predicted that two genes (ORF1 and ORF2 shown in FIG. 4) were present in this region.
- the amino acid sequence encoded by ORF1 is shown in SEQ ID NO: 1
- the amino acid sequence encoded by ORF2 is shown in SEQ ID NO: 29.
- the target sequence in the guide RNA for ORF1 is shown in SEQ ID NO: 30 or 31.
- the target sequence in the guide RNA for ORF2 is shown in SEQ ID NO: 32. Examples of the obtained mutations are shown in Table 2 for ORF1.
- the strain # 612 showed the trait of temperature-sensitive male sterility. Furthermore, although not shown in the figure, it is not limited to the representative example of the mutant strain shown in FIG. 5, and it was confirmed that if a frameshift mutation occurs, the trait of temperature-sensitive male sterility is exhibited, and the gene function of ORF1 is deficient. The loss was found to be the responsible mutation of "PL12".
- This gene is predicted by the ID of LOC_Os07g26794 in the MSU database and by the ID of Os07g0482700 in the RAP-DB, but it is a novel gene of unknown function. This gene is widely conserved in living organisms, especially in plant species. A comparison of the expected amino acid sequences in higher plants is shown in FIG. The conservation of sequences is even higher among grass crops (see Fig. 7). In addition, the temperature-sensitive male sterile gene newly identified in this way was named TMS2.
- Example 2 The gene-deficient genome editing line was cultivated at an allowable temperature and a limit temperature in comparison with the standard variety "Nihonbare” and the temperature-sensitive male sterile line "PL12" before genome editing, and the state of the flower was observed. As a result, as shown in FIG. 8, pollen was normally formed in the standard variety "Nihonbare” regardless of the temperature. On the other hand, in the temperature-sensitive male sterile line "PL12”, pollen is normally formed at 28 ° C and becomes yellow and full anther, whereas pollen does not develop at 33 ° C and the morphology and color of the anther are abnormal. became. Then, the strain lacking the gene in "Nihonbare” by genome editing showed the phenotype of temperature-sensitive male sterility like "PL12".
- strains lacking gene function were cultivated at 28 ° C and 33 ° C by genome editing of the rice variety "Nihonbare". As a result, as shown in FIG. 9, the ears were normally fertilized at 28 ° C. and the ears were dripping, whereas at 33 ° C., the ears were standing because they were not fertile.
- Example 3 Using the practical high-yielding variety of rice “Hokuriku 193" (Indian rice), genome editing was performed in the same manner as in Example 2 ("Nihonbare” (Japanese rice)) to delete the temperature-sensitive male sterile gene. ..
- the transformation of "Hokuriku No. 193" was carried out with reference to the 2014 Nagoya University degree dissertation, "Study on Rice Transformation Method by Agrobacterium tumefaciens” by Yasuhiro Hiei. Then, the genome editing line derived from "Hokuriku 193" thus obtained was cultivated in a greenhouse set under normal conditions (28 ° C.) or high temperature conditions (35 ° C.), and the formed anthers were observed.
- Example 4 For the dicotyledonous Arabidopsis thaliana, we also attempted to create a temperature-sensitive male sterile line by deleting the gene. More specifically, genome editing was performed by the CRISPR / Cas9 method to create a strain in which the gene stopped functioning.
- the target sequence in Arabidopsis thaliana is shown in SEQ ID NO: 33.
- Table 3 shows examples of the obtained mutations.
- strains lacking gene function by genome editing of Arabidopsis thaliana were cultivated at 21 ° C and 27 ° C.
- the pods fertilized normally at 21 ° C. and the length of the pods was the same as that of the wild type, whereas at 27 ° C., the pods did not fertilize and the pods did not grow.
- the Arabidopsis thaliana also shows the trait related to the temperature-sensitive male sterility. Is confirmed.
- Example 3 a mating experiment was conducted in Arabidopsis thaliana. As a result, although not shown in the figure, seeds could be obtained. Therefore, it is suggested that the genome editing line can be used for mating in Arabidopsis thaliana without affecting the function of the pistil by suppressing the function of the temperature-sensitive male sterile gene as in the case of the above-mentioned rice.
- Example 5 In tomato, the genome of the temperature-sensitive male sterile gene was edited and a mutant line was established. Specifically, first, the genome sequence information of the temperature-sensitive male sterile gene of tomato was obtained from EnsenmblePlants. The cDNA (wild type) sequence of the gene is shown in SEQ ID NO: 43. The amino acid sequence of the protein encoded by the cDNA is shown in SEQ ID NO: 9 or 44 (SEQ ID NOs: 9 and 44 show the same amino acid sequence).
- a vector for genome editing was prepared.
- a genome editing vector for plant genome editing pEgP237-2A-GFP
- pEgP237-2A-GFP was sold by a professor at the Department of Penalty, Tokushima University. For more information on the vector, see Ueta et al. (2017) Rapid breeding of parthenocarpic tomato plants using CRISPR / Cas9. Scientific Rep. 7: 507. See.
- pEgP237-2A-GFP was digested with BsaI and then purified. Then, each of the following oligo DNAs chemically synthesized was mixed in equal amounts, and then subjected to a heat denaturation treatment for annealing. The obtained double-stranded oligo DNA was mixed with pEgP237-2A-GFP digested with BsaI, inserted into the vector, and ligated. Then, it was introduced into Escherichia coli and the vector for genome editing was amplified.
- the genome editing vector constructed in this manner was transformed into Rhizobium radiobacter (Agrobacterium tumefaciens) GV2260, and further transformed with the tomato variety "Microtome” using the Agrobacterium method.
- Rhizobium radiobacter Agrobacterium tumefaciens
- GV2260 Rhizobium radiobacter
- tomato variety "Microtome” For the transformation method of tomato, see Sun et al. (2006) A Highly Effective Transition Protocol for Micro-Tom, a Model Cultivar for Tomato Functional Genomics. Plant Cell Physiol. See 47: 426-431.
- the target sequence of the transformant thus obtained was confirmed, and a genome-edited individual was obtained.
- no individual having a homozygous mutation was obtained. Therefore, self-fertilized seeds were selected, and individuals with fixed mutations were selected from the progeny.
- the obtained genome-edited individual was raised at room temperature of 23 ° C./18 ° C. (day / night) for 14 hours until before flowering.
- the temperature was further increased to 30 ° C./28 ° C. (day / night) for 14 hours, and the first flowers were removed. After that, the presence or absence of fruit seeds was confirmed.
- the obtained results are shown in FIG.
- FIG. 14 summarizes the amino acid sequences encoded by the temperature-sensitive male sterile genes derived from various plants used in this example and the mutation sites observed in the prepared genome-edited individuals.
- a temperature-sensitive sterile plant it is possible to produce a temperature-sensitive sterile plant.
- a temperature-sensitive sterile plant can be produced without requiring special breeding other than suppressing the function of the temperature-sensitive male sterile gene of the present invention.
- the amino acid sequence of the protein encoded by the temperature-sensitive male sterile gene of the present invention is highly conserved. Therefore, since the line used in the method of the present invention is not limited, it is possible to produce a male sterile line by suppressing the function of this gene in various varieties and lines of various plant species. For example, it can be immediately used for hybrid production simply by suppressing the function of the temperature-sensitive male sterile gene of a useful variety.
- the present invention is expected to have a great impact on agricultural production, and is an extremely useful technique in the field.
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Abstract
Description
<1> 温度感受性雄性不稔植物の製造方法であって、植物の、下記(a)~(d)からなる群から選択される少なくとも一つの遺伝子の機能を人為的に抑制する工程を含む、方法
(a)配列番号:1~22のうちのいずれかに記載のアミノ酸配列からなるタンパク質をコードする遺伝子
(b)配列番号::1~22のうちのいずれかに記載のアミノ酸配列において1又は複数のアミノ酸が置換、欠失、付加、及び/又は挿入されたアミノ酸配列からなるタンパク質をコードする遺伝子
(c)配列番号::1~22のうちのいずれかに記載のアミノ酸配列と60%以上の相同性を有するアミノ酸配列をコードする遺伝子
(d)配列番号:1~22のうちのいずれかに記載のアミノ酸配列をコードするヌクレオチド配列からなるDNAとストリンジェントな条件でハイブリダイズするDNAを含む遺伝子。
<2> 下記(a)~(d)からなる群から選択される少なくとも一つの遺伝子の機能が人為的に抑制された、温度感受性雄性不稔植物
(a)配列番号:1~22のうちのいずれかに記載のアミノ酸配列からなるタンパク質をコードする遺伝子
(b)配列番号::1~22のうちのいずれかに記載のアミノ酸配列において1又は複数のアミノ酸が置換、欠失、付加、及び/又は挿入されたアミノ酸配列からなるタンパク質をコードする遺伝子
(c)配列番号::1~22のうちのいずれかに記載のアミノ酸配列と60%以上の相同性を有するアミノ酸配列をコードする遺伝子
(d)配列番号:1~22のうちのいずれかに記載のアミノ酸配列をコードするヌクレオチド配列からなるDNAとストリンジェントな条件でハイブリダイズするDNAを含む遺伝子。
<3> ハイブリッド種子の製造方法であって、
制限温度下で栽培し、雄性不稔とした、<2>に記載の温度感受性雄性不稔植物を、任意の植物と他家受粉させる工程、及び
前記温度感受性雄性不稔植物から種子を回収する工程を、
含む方法。
<4> 制限温度下で栽培し、雄性不稔とした、<2>に記載の温度感受性雄性不稔植物を母本とし、任意の植物を父本とする、ハイブリッド種子。
後述の実施例に示すとおり、本発明者らは、温度感受性雄性不稔系統である「水稲中間母本農12号」(PL12)の表現型に関与する責任遺伝子を明らかにした。さらに、野生型のイネ、シロイヌナズナ及びトマトにおいて、当該遺伝子の機能をゲノム編集法により抑制することにより、これら植物に温度感受性雄性不稔形質を付与することにも成功した。したがって、本発明の温度感受性雄性不稔植物の製造方法は、前記遺伝子(温度感受性雄性不稔遺伝子)の機能を人為的に抑制する工程を含むことを特徴とし、より具体的には以下を提供する。
(a)配列番号:1~22のうちのいずれかに記載のアミノ酸配列からなるタンパク質をコードする遺伝子
(b)配列番号::1~22のうちのいずれかに記載のアミノ酸配列において1又は複数のアミノ酸が置換、欠失、付加、及び/又は挿入されたアミノ酸配列からなるタンパク質をコードする遺伝子
(c)配列番号::1~22のうちのいずれかに記載のアミノ酸配列と60%以上の相同性を有するアミノ酸配列をコードする遺伝子
(d)配列番号:1~22のうちのいずれかに記載のアミノ酸配列をコードするヌクレオチド配列からなるDNAとストリンジェントな条件でハイブリダイズするDNAを含む遺伝子。
上述の方法等により、本発明の温度感受性雄性不稔遺伝子の機能が人為的に抑制された、温度感受性雄性不稔植物を得ることができる。したがって、本発明は、
下記(a)~(d)からなる群から選択される少なくとも一つの遺伝子の機能が人為的に抑制された、温度感受性雄性不稔植物
(a)配列番号:1~22のうちのいずれかに記載のアミノ酸配列からなるタンパク質をコードする遺伝子
(b)配列番号::1~22のうちのいずれかに記載のアミノ酸配列において1又は複数のアミノ酸が置換、欠失、付加、及び/又は挿入されたアミノ酸配列からなるタンパク質をコードする遺伝子
(c)配列番号::1~22のうちのいずれかに記載のアミノ酸配列と60%以上の相同性を有するアミノ酸配列をコードする遺伝子
(d)配列番号:1~22のうちのいずれかに記載のアミノ酸配列をコードするヌクレオチド配列からなるDNAとストリンジェントな条件でハイブリダイズするDNAを含む遺伝子
を提供する。
制限温度下で栽培し、雄性不稔とした、請求項2に記載の温度感受性雄性不稔植物を、任意の植物と他家受粉させる工程、及び
前記温度感受性雄性不稔植物から種子を回収する工程を、
含む、ハイブリッド種子の製造方法も提供する。
制限温度下で栽培し、雄性不稔とした、本発明の温度感受性雄性不稔植物を母本とし、任意の植物を父本とする、ハイブリッド種子
も提供する。
イネについては、標準品種「日本晴」、温度感受性雄性不稔系統水稲「中間母本農12号」(PL12)とその原品種「レイメイ」を使用した。また、イネの実用多収品種「北陸193号」(インド型イネ)も使用した。シロイヌナズナについては、標準エコタイプColumbiaを用いた。
イネは、その通常の栽培条件(昼28℃/夜22℃)でポット栽培した。短日条件下で花成を誘導し、昼28℃/夜22℃又は昼33℃/夜22℃において栽培を続けた。出穂時に花粉の形成を観察するとともに、種子稔性を確認した。
植物で一般的に用いられているCRISPR/Cas9法を利用した。より具体的には、ガイドRNA、Cas9、及び選抜マーカーとしてハイグロマイシン抵抗性遺伝子を発現するベクターをアグロバクテリウム法により、イネ品種「日本晴」のカルス又は「北陸193号」の未熟胚に導入した。なお、当該ベクターは、pPZP202を基にし、ガイドRNA及びCas9を、各々イネのU6プロモーター及びイネのユビキチンプロモーターの制御下にて発現し得る。次いで、ハイグロマイシン抵抗性で選抜したカルスから再分化植物を得、その葉からゲノムDNAを調製し、ゲノム編集部分の塩基配列を確認した。1塩基挿入等、コドンの読み枠がずれる変異をもつものを選定した。これらの変異体では、この遺伝子が機能するタンパク質を発現することができないため、遺伝子欠損の状態となる。
前記イネ同様、CRISPR/Cas9法を用いてゲノム編集を行なった。前記イネとは遺伝子導入方法が異なる。シロイヌナズナの形質転換には、一般に用いられているフローラルディップ法を用いた。
温度感受性雄性不稔形質の責任変異を同定するため、ファインマッピングを行ったが、54cM付近の約1.8Mbより範囲を狭めることができなかった。そこで、原品種の「レイメイ」と「PL12」の全ゲノムシーケンス解析を行い、両者を比較した。その結果、「PL12」第7染色体の当該部分に約150kbの欠失があることが判明した。
前記遺伝子を欠損したゲノム編集系統を、ゲノム編集前の標準品種「日本晴」、温度感受性雄性不稔系統「PL12」と比較して許容温度と制限温度で栽培し、穎花の様子を観察した。その結果、図8に示すとおり、標準品種「日本晴」では、温度によらず正常に花粉が形成された。一方、温度感受性雄性不稔系統「PL12」は、28℃では正常に花粉が形成されて黄色く充実した葯となるのに対し、33℃では花粉が発達せず、葯の形態や色が異常となった。そして、ゲノム編集により「日本晴」において前記遺伝子を欠損した系統は、「PL12」と同様に温度感受性雄性不稔の表現型を示した。
イネの実用多収品種「北陸193号」(インド型イネ)を用いて、実施例2(「日本晴」(日本型イネ))同様にゲノム編集を行い、温度感受性雄性不稔遺伝子を欠損させた。なお、「北陸193号」の形質転換は、樋江井祐弘「Agrobacterium tumefaciens によるイネ形質転換方法に関する研究」2014年名古屋大学学位論文を参照して行った。そして、このようにして得られた「北陸193号」由来ゲノム編集系統を、通常条件(28℃)又は高温条件(35℃)に設定した温室で栽培し、形成された葯を観察した。
双子葉植物のシロイヌナズナについても、前記遺伝子を欠損させることで、温度感受性雄性不稔系統を作出することを試みた。より具体的には、CRISPR/Cas9法によりゲノム編集を行い、前記遺伝子が機能しなくなった系統を作出した。
トマトにおいて、温度感受性雄性不稔遺伝子のゲノム編集を行い、変異系統を樹立した。具体的には先ず、トマトの温度感受性雄性不稔遺伝子のゲノム配列情報をEnsenmblePlantsから取得した。なお、当該遺伝子のcDNA(野生型)の配列を配列番号:43に示す。また、当該cDNAがコードするタンパク質のアミノ酸配列を、配列番号:9又は44に示す(配列番号:9と44とでは同一のアミノ酸配列を示している)。
GE51 (第3エクソン内)
5’-ACCATAGGTGAGAAGTCACGAGG-3’(配列番号:37)
GE52 (第4エクソン内)
5’-CCAGGCTGTCTACCAGAGAAATG-3’ (配列番号:38)。
#51
Sl_tms2_gRNA01F
5’-GATTGACCATAGGTGAGAAGTCACG-3’ (配列番号:39)
Sl_tms2_gRNA01R
5’-AAACCGTGACTTCTCACGATACCA-3’ (配列番号:40)
#52
Sl_tms2_gRNA02F
5’-GATTGCATTTCTCTGGTAGACAGCG-3’ (配列番号:41)
Sl_tms2_gRNA02R
5’-AAACGGCTGTCTACCAGAGAAATG-3’ (配列番号:42)。
Claims (4)
- 温度感受性雄性不稔植物の製造方法であって、
植物の、下記(a)~(d)からなる群から選択される少なくとも一つの遺伝子の機能を人為的に抑制する工程を含む、方法
(a)配列番号:1~22のうちのいずれかに記載のアミノ酸配列からなるタンパク質をコードする遺伝子
(b)配列番号::1~22のうちのいずれかに記載のアミノ酸配列において1又は複数のアミノ酸が置換、欠失、付加、及び/又は挿入されたアミノ酸配列からなるタンパク質をコードする遺伝子
(c)配列番号::1~22のうちのいずれかに記載のアミノ酸配列と60%以上の相同性を有するアミノ酸配列をコードする遺伝子
(d)配列番号:1~22のうちのいずれかに記載のアミノ酸配列をコードするヌクレオチド配列からなるDNAとストリンジェントな条件でハイブリダイズするDNAを含む遺伝子。 - 下記(a)~(d)からなる群から選択される少なくとも一つの遺伝子の機能が人為的に抑制された、温度感受性雄性不稔植物
(a)配列番号:1~22のうちのいずれかに記載のアミノ酸配列からなるタンパク質をコードする遺伝子
(b)配列番号::1~22のうちのいずれかに記載のアミノ酸配列において1又は複数のアミノ酸が置換、欠失、付加、及び/又は挿入されたアミノ酸配列からなるタンパク質をコードする遺伝子
(c)配列番号::1~22のうちのいずれかに記載のアミノ酸配列と60%以上の相同性を有するアミノ酸配列をコードする遺伝子
(d)配列番号:1~22のうちのいずれかに記載のアミノ酸配列をコードするヌクレオチド配列からなるDNAとストリンジェントな条件でハイブリダイズするDNAを含む遺伝子。 - ハイブリッド種子の製造方法であって、
制限温度下で栽培し、雄性不稔とした、請求項2に記載の温度感受性雄性不稔植物を、任意の植物と他家受粉させる工程、及び
前記温度感受性雄性不稔植物から種子を回収する工程を、
含む方法。 - 制限温度下で栽培し、雄性不稔とした、請求項2に記載の温度感受性雄性不稔植物を母本とし、任意の植物を父本とする、ハイブリッド種子。
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CN115349017A (zh) | 2022-11-15 |
US20240099210A1 (en) | 2024-03-28 |
JPWO2021193865A1 (ja) | 2021-09-30 |
EP4129050A4 (en) | 2024-05-08 |
EP4129050A1 (en) | 2023-02-08 |
CA3179934A1 (en) | 2021-09-30 |
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