WO2009113249A1 - イネcw型雄性不稔細胞質に対する稔性回復遺伝子及び稔性回復方法 - Google Patents
イネcw型雄性不稔細胞質に対する稔性回復遺伝子及び稔性回復方法 Download PDFInfo
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- WO2009113249A1 WO2009113249A1 PCT/JP2009/000753 JP2009000753W WO2009113249A1 WO 2009113249 A1 WO2009113249 A1 WO 2009113249A1 JP 2009000753 W JP2009000753 W JP 2009000753W WO 2009113249 A1 WO2009113249 A1 WO 2009113249A1
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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
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- 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
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
- A61P15/00—Drugs for genital or sexual disorders; Contraceptives
- A61P15/08—Drugs for genital or sexual disorders; Contraceptives for gonadal disorders or for enhancing fertility, e.g. inducers of ovulation or of spermatogenesis
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- 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
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- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q1/00—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions
- C12Q1/68—Measuring or testing processes involving enzymes, nucleic acids or microorganisms; Compositions therefor; Processes of preparing such compositions involving nucleic acids
- C12Q1/6876—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes
- C12Q1/6888—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for detection or identification of organisms
- C12Q1/6895—Nucleic acid products used in the analysis of nucleic acids, e.g. primers or probes for detection or identification of organisms for plants, fungi or algae
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12Q—MEASURING OR TESTING PROCESSES INVOLVING ENZYMES, NUCLEIC ACIDS OR MICROORGANISMS; COMPOSITIONS OR TEST PAPERS THEREFOR; PROCESSES OF PREPARING SUCH COMPOSITIONS; CONDITION-RESPONSIVE CONTROL IN MICROBIOLOGICAL OR ENZYMOLOGICAL PROCESSES
- C12Q2600/00—Oligonucleotides characterized by their use
- C12Q2600/156—Polymorphic or mutational markers
Definitions
- the present invention relates to a method for recovering the fertility of CW-type cytoplasmic male sterile rice, a method for identifying the presence or absence of a fertility recovery gene, and the like.
- Cytoplasmic Male Sterility (hereinafter also referred to as “CMS”) in higher plants means that fertilized pollen formation is inhibited due to mutations in the mitochondrial gene and seeds do not fall.
- CMS Cytoplasmic Male Sterility
- Rf fertility-recovery gene
- the first-generation hybrid breeding method is also called a hybrid variety breeding method, and it is used for breeding breeds because it can breed breeds that have superior traits of parents and show hybrid strength.
- the three-line method utilizing cytoplasmic male sterility is used for seed production of hybrid varieties in rice.
- the three-line method refers to a sterile line that is a male sterile line, a fertile recovery line, and a maintenance line that is a line that has the same nuclear gene but does not have a sterile cytoplasm.
- the method to use Using these three lines, (i) hybrid seed can be obtained by crossing the pollen of the recovery line to the sterile line, and (ii) crossing the pollen of the maintenance line to the sterile line. By this, a sterile system can be maintained.
- Non-patent Document 1 Non-patent Document 1
- the specific structure and function of the gene Rf17 was not clear, it has not been used so far.
- the male sterile cytoplasm that has been used so far has a limited genetic resource, there is a risk of cultivar disruption. Therefore, it is desired to develop a new use of male sterile cytoplasm.
- a plant body (F1) is grown from the mated seed subjected to the test mating, and then the F1 plant is self-propagated to form its seed. It was necessary to investigate the frequency of appearance of individuals whose rate was above a certain level (for example, 90% or more). Genotyping using DNA markers could not be performed. Sota Fujii and Kinya Toriyama (2005) Molecular mapping of the fertility restorer gene for ms-CW-type cytoplasmic male sterility of rice.Theor.Appl.Gent. 111: 696-701
- the main object of the present invention is to provide a technique for directly identifying the genotype of the Rf17 locus based on its specific nucleotide sequence information, and a technique for artificially creating a fertility recovery line. And so on.
- the present inventors determined the sequence shown in SEQ ID NO: 1 as the base sequence containing the fertility recovery gene Rf17 for CW-type male sterile cytoplasm. Furthermore, by suppressing the expression of the gene shown in the base sequence 2, the fertility of CW-type cytoplasmic male sterile rice was successfully recovered and the present invention was completed.
- Aspect 2 Genomic fragment derived from chromosome 4 of the fertility-recovering line for CW-type cytoplasmic male sterility, comprising a nucleic acid having at least the 1611 to 4835th base sequence in the base sequence shown in SEQ ID NO: 1. The method according to embodiment 1, wherein the fertility is restored by introducing CW-type cytoplasmic male sterile rice into rice.
- Aspect 3 The method according to Aspect 2, wherein the genomic fragment consists of the entire base sequence shown in SEQ ID NO: 1.
- Aspect 4 The method according to Aspect 1, wherein the fertility of CW-type cytoplasmic male sterile rice is recovered by suppressing the gene expression of SEQ ID NO: 2 using RNA interference method.
- a duplex comprising a gene consisting of the base sequence shown in SEQ ID NO: 2 or its 3 ′ non-translated region and 100 to 500 consecutive base sequences and its complementary sequence, and capable of inducing RNA interference in cells
- RNA interference is induced by introducing a vector expressing RNA into CW-type cytoplasmic male sterile rice.
- Aspect 6 Aspect 5 using a vector that expresses double-stranded RNA that includes the 638th to 815th continuous base sequence in the base sequence shown in SEQ ID NO: 2 and its complementary sequence and can induce RNA interference in cells The method described.
- Aspect 7 Rice whose fertility has been recovered by the method according to any one of Aspects 1 to 6.
- Aspect 8 A method for breeding a first-generation hybrid variety using the rice according to Aspect 7.
- Aspect 9 F1 seeds obtained from the first hybrid variety obtained by the breeding method according to Aspect 8.
- a fertility-recovering gene for CW-type cytoplasmic male sterility comprising identifying a single nucleotide polymorphism (SNP) at the 1812th base of the nucleotide sequence shown in SEQ ID NO: 1 in the tested rice A method for identifying the presence or absence of the Rf17 gene.
- SNP single nucleotide polymorphism
- Aspect 12 The method according to Aspect 11, wherein a restriction enzyme having a cleavage recognition sequence GT (A) AAC is used.
- Aspect 13 The method according to Aspect 12, wherein the restriction enzyme is MaeIII.
- Aspect 14 A kit for use in the method according to any one of Aspects 10 to 13.
- Starch degradation is observed in fertile recovery lines (CWR) and ORF11 RNA interference vector (RNAi ⁇ ORF11_3), but male sterile lines (CWA) and PPR2 RNA interference vector (RNAi ⁇ ⁇ ⁇ ⁇ PPR2_1) ) No starch degradation was observed.
- the fertility-recovery line (CWR) produced a band of 370 bp, while the varieties that did not have fertility recovery (Taichung 65, T65) produced bands of 276 and 84 bp.
- the present inventor succeeded in specifying a genomic region (SEQ ID NO: 1) containing the fertility-recovery gene Rf17 for CW-type male sterile cytoplasm in rice chromosome 4 by map-based cloning according to a conventional method, Furthermore, it succeeded in restoring the fertility of CW-type cytoplasmic male sterile rice by suppressing or reducing the expression of the gene shown in SEQ ID NO: 2.
- the function of the gene (ORF11) consisting of the base sequence shown in SEQ ID NO: 2 is unknown.
- the map-based cloning method is a method of narrowing down the genomic region where a gene exists using a DNA marker located in the vicinity of the gene to be isolated. This is one of the gene isolation methods when the function cannot be estimated. This technique has been conventionally used for gene isolation in some animals and plants, but is more effectively used in plants that can systematically create experimental segregations.
- map-based cloning in the present invention the genome sequence of Nipponbare rice (http://rgp.dna.affrc.go.jp/J/index.html) was used.
- the present inventor has used a method for suppressing or reducing the expression of the gene consisting of the nucleotide sequence shown in SEQ ID NO: 2 as a method for restoring a fertility recovery line for CW-type cytoplasmic male sterility.
- the entire base sequence shown in SEQ ID NO: 1 can be mentioned.
- a nucleic acid that hybridizes under stringent conditions with a nucleic acid consisting of a base sequence complementary to the nucleic acid consisting of the base sequence shown in SEQ ID NO: 1 or a part thereof, and about A nucleic acid comprising a base sequence having a sequence homology of 80% or more, preferably about 95% or more, which can restore the fertility of CW-type cytoplasmic male sterile rice is also included.
- hybridization is performed by, for example, Molecular cloning third. ed. (Cold Spring Harbor Lab. Press, 2001) and the like, such as a method known in the art or a method analogous thereto. Moreover, when using a commercially available library, it can carry out according to the method as described in an attached instruction manual.
- under stringent conditions includes, for example, conditions in which a sodium concentration is 150 to 900 mM, preferably 600 to 900 mM, pH 6 to 8 at a temperature of 60 ° C. to 68 ° C. .
- nucleic acid capable of hybridizing with a nucleic acid consisting of a base sequence complementary to the base sequence shown in SEQ ID NO: 1 or a part thereof for example, the degree of homology with the entire base sequence of the nucleic acid is:
- sequences are preprocessed in an optimal state for comparison. For example, by making a gap in one sequence, the alignment with the other sequence is optimized. Thereafter, the amino acid residues or bases at each site are compared. When the same amino acid residue or base as the corresponding site in the second sequence is present at a site in the first sequence, the sequences are identical at that site. Sequence homology between the two sequences is expressed as a percentage of the total number of sites (all amino acids or all bases) of the number of sites that are identical between the sequences.
- sequence homology between two base sequences can be determined by, for example, the algorithm of Karlin and Altschul (Proc. Natl. Acad. Sci. USA 87: 2264-2268, 1990 and Proc. Natl. Acad. Sci. USA 90). : 5873-5877, 1993).
- a BLAST program or FASTA program using such an algorithm is mainly used for searching a database for sequences showing high sequence homology with a given sequence. These are available, for example, on the Internet website of National Center for Biotechnology Information.
- Nucleic acids that exhibit sequence homology as described above can also be obtained using hybridization as an index as described above, and can be obtained from DNA groups of unknown function obtained by genome sequence analysis or public databases. Therefore, it is easy to find by a method that is usually used by a researcher in this technical field, for example, by searching using the BLAST software described above. Furthermore, the gene of the present invention can also be obtained by various known mutagenesis methods.
- any other means known to those skilled in the art can be used.
- the CW-type cytoplasmic male sterile rice is suppressed by suppressing the gene expression of SEQ ID NO: 2 using the antisense RNA method and RNA interference method as described in the Examples of the present specification. It is possible to restore the fertility.
- a vector appropriately designed to express double-stranded RNA capable of inducing RNA interference so that expression of the gene consisting of the nucleotide sequence shown in SEQ ID NO: 2 can be suppressed or reduced is expressed as a CW cytoplasmic male.
- RNA interference can be induced by introducing into sterile rice.
- a vector for example, a gene consisting of the base sequence shown in SEQ ID NO: 2 or a base sequence consisting of 100 to 500, preferably 150 to 200 consecutive base pairs in its 3 ′ untranslated region and its complement
- a vector that expresses a double-stranded RNA containing a sequence and capable of inducing RNA interference in a cell can be mentioned.
- the base sequence consisting of 178 to 815th consecutive bases in the base sequence shown in SEQ ID NO: 2 and having a length of 178 to 815 (the first base is the first) and its complement
- vectors that express the double-stranded RNA containing the sequence and capable of inducing RNA interference in the cell.
- the vector can be prepared by ligating the DNA into a vector using an appropriate genetic engineering means known to those skilled in the art.
- the vector can contain an appropriate promoter capable of expressing the gene of the present invention in a host cell and other various control sequences (for example, an enhancer sequence, terminator sequence, polyadenylation sequence, etc.).
- the genome region or the vector used for suppressing or reducing the expression of the gene consisting of the nucleotide sequence shown in SEQ ID NO: 2 in CW-type cytoplasmic male sterile rice can be obtained by an appropriate method known to those skilled in the art, for example, agro It can be introduced into the target rice by the bacterial method, freeze-thaw method, electroporation method or the like.
- the present invention further relates to a fertility-recovering gene for CW-type cytoplasmic male sterility, wherein the SNP (A / T) at the 1812th base of the base sequence shown in SEQ ID NO: 1 in the test rice is identified.
- the present invention relates to a method for identifying the presence or absence of an Rf17 gene or a genomic region containing the gene.
- SNP identification can be performed by any method known to those skilled in the art. For example, nucleotide sequence determination method, SSCP (single strand conformation polymorphism) method, allele specific amplification (ASA), primer extension method (primer extension), takuman method, invasion method, dot-blot-SNP method FRIP (Fluorogenic Ribonuclease Protection) method, TILLING (Targeting Induced Local Lesion in Genome) method, and the like.
- SSCP single strand conformation polymorphism
- ASA allele specific amplification
- primer extension method primer extension
- takuman method invasion method
- dot-blot-SNP method FRIP Fluorogenic Ribonuclease Protection
- TILLING Targeting Induced Local Lesion in Genome
- CAPS Cosmetic Amplified Polymorphic Sequence
- a primer is designed so that a restriction enzyme recognition site is formed at a position where an SNP is present, and PCR-RFLP analysis is performed using a polyacrylamide gel.
- the advantage of this method is that a stable result is easily obtained, and the result is not easily influenced by the person to be inspected, the state of the sample, the DNA extraction method, and the like.
- the method is relatively simple, and expensive analysis devices and techniques such as a DNA sequencer are not required.
- the primers, markers, probes, etc. used in each of the above SNP identification methods are determined based on the above database and the DNA sequence information represented by SEQ ID NO: 1 or 2 disclosed in the present specification according to each measurement principle. Can be easily designed and prepared by a vendor.
- the length of a primer used in PCR in the CAPS method is usually about several tens of bp, for example, 10 to 30 bp.
- oligonucleotides used as primers, markers, probes, etc. can be obtained by methods known to those skilled in the art, for example, Carruthers (1982) Cold Spring Harbor Symp. Quant. Biol. 47: 411-418; Adams (1983) J. Am. Chem. Soc. 105: 661; Belousov (1997) Nucleic Acid Res. 25: 3440-3444; Frenkel (1995) Free Radic. Biol. Med. 19: 373-380; Blommers (1994) Biochemistry 33: 7886-7896; Narang (1979) Meth. Enzymol. 68:90; Brown (1979) Meth. Enzymol. 68: 109; Beaucage (1981) Tetra. Lett. 22: 1859; US Patent No. 4,458,066) It can also be synthesized in vitro by well-known chemical synthesis techniques as described. For detection, any labeling substance known to those skilled in the art can be bound.
- Examples of rice to be tested include any part of rice (eg, seeds, leaves and stems). Extraction and preparation of DNA from these samples can be performed by methods known to those skilled in the art. Although there is no restriction
- the amount of DNA extracted from the rice to be tested is sufficient for detection, it can be subjected to subsequent operations without any particular amplification.
- the PCR (Polymerase Chain Reaction) method or the RT-PCR method the other ICAN (Isothermal and in chimeric prime-initiated amplification of nucleic acids) method, NASABA (Nucleic acid sequence based amplification) method, TMA (Transcription-mediated) SNP identification can also be performed after amplification to an appropriate amount by any gene amplification method known to those skilled in the art, such as amplification) and SDA (Strand Displacement Amplification) methods.
- the present invention further relates to a kit for use in the method for identifying the presence or absence of the Rf17 gene.
- the kit includes a primer, a marker, a probe, or the like used for each SNP identification method.
- a primer used for each SNP identification method.
- restriction enzymes used for DNA amplification, restriction enzymes, and other elements or components known to those skilled in the art, such as various reagents, enzymes, buffers, and reaction plates (containers)
- Necessary items can be appropriately included depending on the configuration and purpose.
- ORF11 a gene of unknown function
- PPR is an abbreviation for pentatricopeptideeatrepeat. It is a protein with a conserved sequence repeat consisting of 35 amino acids. PPR protein binds to organelle RNA to control RNA processing, stabilization, and translation. It is thought that
- a nucleotide sequence corresponding to positions 638 to 815 in SEQ ID NO: 2 (the first base is the first), or a nucleotide sequence corresponding to positions 772 to 1505 in SEQ ID NO: 1 (the first base is the first) ( PPR2 gene) is amplified by PCR using the primers shown in SEQ ID NOs: 3 and 4 and SEQ ID NOs: 5 and 6, respectively, and ligated downstream of the ubiquitin promoter of the pANDA vector in sense and antisense directions, respectively. To create a vector that induces RNA interference. These vectors were introduced into CW-type CMS lines by Agrobacterium method, and pollen morphology and seed fertility were investigated.
- ORF11 expression was reduced to 30-77% in 7 lines into which the ORF11 RNA interference vector was introduced, and 4 of them showed pollen starch degradation characteristic of the recovered line (Fig. 2). Furthermore, seed fertility was partially recovered, and seed fertility of 2-3% was shown. On the other hand, PPR2 expression was reduced to 27-75% in 6 lines with the PPR2 RNA interference vector introduced, but no starch degradation of pollen was observed as in the CMS line (Fig. 2), and seed fertility was 0%. Met. From the above results, it was clarified that the fertility of CW CMS can be recovered by suppressing the expression of ORF11.
- the restriction enzyme is not limited to MaeIII, and a restriction enzyme having a cleavage recognition sequence GT (A) AAC can be used.
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Abstract
Description
Sota Fujii and Kinya Toriyama (2005) Molecular mapping of the fertility restorer gene for ms-CW-type cytoplasmic male sterility of rice. Theor. Appl. Genet. 111:696-701
従って、本発明の主な目的は、Rf17遺伝子座の遺伝子型をその具体的な塩基配列情報に基づき、直接同定する技術を提供すること、及び、人為的に稔性回復系統を作成する技術を提供すること等である。
[態様1]CW型細胞質雄性不稔性のイネにおいて、配列番号2に示す塩基配列から成る遺伝子の発現を抑制又は減少することにより、該イネの稔性を回復させる方法。
[態様2]CW型細胞質雄性不稔性に対する稔性回復系統の第4染色体由来のゲノム断片であり、配列番号1に示す塩基配列における少なくとも1611~4835番目の塩基配列を有する核酸を含むゲノム断片をCW型細胞質雄性不稔性のイネに導入することにより稔性を回復する、態様1記載の方法。
[態様3]ゲノム断片が配列番号に1示す全塩基配列から成る、態様2記載の方法。
[態様4]RNA干渉法を用いて配列番号2の遺伝子発現を抑制することにより、CW型細胞質雄性不稔性のイネの稔性を回復させる、態様1記載の方法。
[態様5]配列番号2に示す塩基配列から成る遺伝子又はその3’非翻訳領域における100~500個の連続した塩基配列及びその相補配列を含み、細胞内でRNA干渉を誘導し得る二重鎖RNAを発現するベクターをCW型細胞質雄性不稔性のイネに導入することによりRNA干渉を誘導する、態様4記載の方法。
[態様6]配列番号2に示す塩基配列における638~815番目の連続した塩基配列及びその相補配列を含み、細胞内でRNA干渉を誘導し得る二重鎖RNAを発現するベクターを用いる、態様5記載の方法。
[態様7]態様1~6のいずれか一項に記載の方法により稔性が回復したイネ。
[態様8]態様7記載のイネを用いて一代雑種品種を育種する方法。
[態様9]態様8記載の育種方法によって得られる一代雑種品種から採種されたF1種子。
[態様10]被検定イネにおいて配列番号1に示す塩基配列の第1812番目の塩基における一塩基多型(SNP)を同定することなら成る、CW型細胞質雄性不稔性に対する稔性回復遺伝子であるRf17遺伝子の有無の識別方法。
[態様11]CAPS法により一塩基多型 (SNP; single nucleotide polymorphism)を同定する、態様10記載の方法。
[態様12]切断認識配列 GT(A)AACを持つ制限酵素を使用する、態様11記載の方法。
[態様13]制限酵素がMaeIIIである、態様12記載の方法。
[態様14]態様10~13のいずれか一項に記載の方法に使用するキット。
CW型CMSに対する稔性回復系統(CWR系統)を材料とし、Rf17のマッピングを行ったところ、第4染色体の77 kbの範囲に存在することがわかり、当該領域の塩基配列を決定した。このゲノム領域を7個の断片に分けて、サブクローニングし、それぞれのゲノム断片をアグロバクテリウム法によりCW型CMS系統へ遺伝子導入して、得られた形質転換植物の種子稔性稔性を調査した。ゲノム断片No.5を導入した形質転換植物において稔性が回復した個体が得られた(表1)。再分化系統44系統の中で4個体について稔性が回復した。これらの4個体の種子稔性はそれぞれ79.3, 23.1, 25.3, 68.1%であった。ゲノム断片No.5の塩基配列を配列番号1に示す。
CW型CMSに対する稔性回復遺伝子Rf17のマッピングを行い、77 kbの候補領域に14個の候補遺伝子を見いだした。CMS系統と稔性回復系統で多型解析を行ったところ、アミノ酸変異を生じる遺伝子はPPR遺伝子(図1のPPR2遺伝子)1個のみであり、稔性回復系統(CWR)のアリルでストップコドンが生じていた。14個の候補遺伝子それぞれについて発現解析を行ったところ、CMS系統と稔性回復系統(CWR)で差が見られた遺伝子はORF11遺伝子のみであった。ORF11遺伝子のコード領域、その5’及び3’非翻訳領域を含む塩基配列を配列番号2に示す。配列番号2における638 ~815番目(最初の塩基を1番目とする)に相当する塩基配列、または、配列番号1における772 ~1505番目(最初の塩基を1番目とする)に相当する塩基配列(PPR2遺伝子に対応)を、それぞれ配列番号3及び4、並びに配列番号5及び6に示したプライマーを用いてPCR法により増幅し、それぞれセンスおよびアンチセンス方向でpANDAベクターのユビキチンプロモーターの下流に連結してRNA干渉を誘導するベクターに作成した。これらのベクターをアグロバクテリウム法によりCW型CMS系統に遺伝子導入して花粉の形態と種子稔性を調査した。その結果、ORF11のRNA干渉ベクターを導入した7系統においてORF11の発現が30~77%に減少し、その中の4系統において、回復系統に特徴的な花粉のデンプン分解を示し(図2)、さらに、種子稔性が部分的に回復し、2~3%の種子稔性を示した。他方、PPR2のRNA干渉ベクターを導入した6系統においてPPR2の発現が27~75%に減少したが、CMS系統と同様に花粉のデンプン分解は見られず(図2)、種子稔性は0%であった。
以上の結果より、ORF11の発現抑制によりCW型CMSの稔性を回復できることを明らかにした。
稔性回復遺伝子Rf17を含む配列番号1に記載した塩基配列と、公開されている日本晴の塩基配列を比較すると、配列番号1に記載した塩基配列の1812番目が稔性回復系統(CWR)ではTであるが、稔性回復力が無い日本晴ではAである。この変異を簡便に判定するため、CAPSマーカーを作成した。配列番号7及び8に示した2種類にプライマーを用いてPCRを行い、増幅断片を制限酵素MaeIII で処理してから電気泳動を行うと、稔性回復系統(CWR)は370 bpのバンドを生じるが、稔性回復力を持たない品種は276 bpと84 bpのバンドを生じる(図3)。
以上より、CAPSマーカーを用いてRf17の有無を簡便に判定できることを明らかにした。なお、制限酵素はMaeIIIに限定されるものではなく、切断認識配列 GT(A)AACを持つ制限酵素が利用できる。
Claims (14)
- CW型細胞質雄性不稔性のイネにおいて、配列番号2に示す塩基配列から成る遺伝子の発現を抑制又は減少することにより、該イネの稔性を回復させる方法。
- CW型細胞質雄性不稔性に対する稔性回復系統の第4染色体由来のゲノム断片であり、配列番号1に示す塩基配列における少なくとも1611~4835番目の塩基配列を有する核酸を含むゲノム断片をCW型細胞質雄性不稔性のイネに導入することにより稔性を回復する、請求項1記載の方法。
- ゲノム断片が配列番号1に示す全塩基配列から成る、請求項2記載の方法。
- RNA干渉法を用いて配列番号2の遺伝子発現を抑制することにより、CW型細胞質雄性不稔性のイネの稔性を回復させる、請求項1記載の方法。
- 配列番号2に示す塩基配列から成る遺伝子又はその3’非翻訳領域における100~500個の連続した塩基配列及びその相補配列を含み、細胞内でRNA干渉を誘導し得る二重鎖RNAを発現するベクターをCW型細胞質雄性不稔性のイネに導入することによりRNA干渉を誘導する、請求項4記載の方法。
- 配列番号2に示す塩基配列における638~815番目の連続した塩基配列及びその相補配列を含み、細胞内でRNA干渉を誘導し得る二重鎖RNAを発現するベクターを用いる、請求項5記載の方法。
- 請求項1~6のいずれか一項に記載の方法により稔性が回復したイネ。
- 請求項7記載のイネを用いて一代雑種品種を育種する方法。
- 請求項8記載の育種方法によって得られる一代雑種品種から採種されたF1種子。
- 被検定イネにおいて配列番号1に示す塩基配列の第1812番目の塩基における一塩基多型(SNP)を同定することなら成る、CW型細胞質雄性不稔性に対する稔性回復遺伝子であるRf17遺伝子の有無の識別方法。
- CAPS法により一塩基多型(SNP)を同定する、請求項10記載の方法。
- 切断認識配列 GT(A)AACを持つ制限酵素を使用する、請求項11記載の方法。
- 制限酵素がMaeIIIである、請求項12記載の方法。
- 請求項10~13のいずれか一項に記載の方法に使用するキット。
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US12/922,071 US8344122B2 (en) | 2008-03-12 | 2009-02-21 | Fertility restorer gene and fertility restoration method for CW-type male sterile cytoplasm of rice |
EP09719291A EP2258165A4 (en) | 2008-03-12 | 2009-02-21 | FERTILITY RESTAURANT GENE AND FERTILITY RESTAURANT METHOD FOR CYTOPLASM RUST TYPE CW STERILE |
CN200980108483.4A CN101969758B (zh) | 2008-03-12 | 2009-02-21 | 对于水稻cw型雄性不育细胞质的育性恢复基因及育性恢复方法 |
US13/708,459 US20130174296A1 (en) | 2008-03-12 | 2012-12-07 | Fertility restorer gene and fertility restoration method for cw-type male sterile cytoplasm of rice |
US14/153,678 US20140130201A1 (en) | 2008-03-12 | 2014-01-13 | Fertility restorer gene and fertility restoration method for cw-type male sterile cytoplasm of rice |
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WO2013058404A1 (ja) * | 2011-10-21 | 2013-04-25 | 国立大学法人九州大学 | Pprモチーフを利用したrna結合性蛋白質の設計方法及びその利用 |
CN104531894A (zh) * | 2015-01-31 | 2015-04-22 | 中南民族大学 | 一种用于鉴定水稻育性恢复基因的特异引物组合以及应用 |
US9574237B2 (en) | 2011-11-28 | 2017-02-21 | Anglo Netherlands Grain B.V. | Method for differentiating fertile and sterile plant lines by detection of polymorphic markers in chloroplast DNA |
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EP2258165A4 (en) * | 2008-03-12 | 2011-04-13 | Univ Tohoku | FERTILITY RESTAURANT GENE AND FERTILITY RESTAURANT METHOD FOR CYTOPLASM RUST TYPE CW STERILE |
EP3368654A4 (en) * | 2015-10-30 | 2019-06-05 | Alere Inc. | DETERMINATION OF POLYMORPHISMS BY ISOTHERMAL AMPLIFICATION OF NUCLEIC ACID |
CN107663549A (zh) * | 2017-10-18 | 2018-02-06 | 中国科学院昆明植物研究所 | 一种基于植物线粒体基因组特征的细胞质雄性不育基因预测的方法 |
CN115677839B (zh) * | 2021-07-21 | 2023-11-07 | 中国科学院遗传与发育生物学研究所 | 水稻OsTOPBP1C蛋白及其编码基因的应用 |
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JPWO2013058404A1 (ja) * | 2011-10-21 | 2015-04-02 | 国立大学法人九州大学 | Pprモチーフを利用したrna結合性蛋白質の設計方法及びその利用 |
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US11742056B2 (en) | 2011-10-21 | 2023-08-29 | Kyushu University, National University Corporation | Method for designing RNA-binding protein utilizing PPR motif, and use thereof |
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