WO2013082865A1 - 一种制备育性减低植物的方法 - Google Patents
一种制备育性减低植物的方法 Download PDFInfo
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- C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
- C12N15/113—Non-coding nucleic acids modulating the expression of genes, e.g. antisense oligonucleotides; Antisense DNA or RNA; Triplex- forming oligonucleotides; Catalytic nucleic acids, e.g. ribozymes; Nucleic acids used in co-suppression or gene silencing
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- C12N15/8289—Male sterility
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Definitions
- the invention relates to the field of biotechnology, and in particular to a method for preparing a fertility reducing plant.
- Plant male sterility is a botanical trait closely related to agricultural production, which is the result of genotype expression and environment interaction during plant development.
- the male sterility of the plant itself can be used as a genetic tool to develop and utilize crop heterosis, and to carry out breeding studies such as recurrent selection and backcrossing, without the need for artificial emasculation.
- breeding studies such as recurrent selection and backcrossing, without the need for artificial emasculation.
- Nongken 58S is the earliest discovered male-sterile material for photoperiod-regulated breeding. It and its indica and japonica-sensitive male-sterile lines can be induced to be infertile by long-day exposure in a certain temperature range, and short-day induced fertility. They are also known as light-sensitive thermo-sterile lines because they are also affected by temperature.
- a non-coding precursor RNA was identified by gene mapping to regulate photo-temperature-sensitive sterility. However, the abnormally low temperature ( ⁇ 23 degrees) in summer will cause seed production to fail, so the application of photo-thermophilic materials has been affected.
- the RNA interference vector provided by the present invention is a vector obtained by inserting the molecule shown by the sequence 1 in the sequence listing into pH7GWIWG2 (I I ).
- RNA interference vector is a vector obtained by inserting a spiritual molecule represented by the sequence 1 in the sequence listing into PH7GWIWG2 (II) by homologous recombination; specifically, the DNA molecule represented by the sequence 1 in the sequence listing is subjected to homologous recombination.
- RNA interference vector was prepared as follows:
- the DNA molecule shown in SEQ ID NO: 1 in the above Sequence Listing is specifically prepared by PCR-amplifying A with the cDNA of rice as a template to obtain a PCR product which is a DNA molecule represented by SEQ ID NO:1 in the Sequence Listing.
- the primer pair A consists of a single-stranded spirit consisting of a single-stranded sequence and a sequence 4 shown in SEQ ID NO:3 in the Sequence Listing.
- RNA interference vectors described above are also within the scope of the invention.
- the use of the above RNA interference vector, the above-mentioned recombinant strain or transgenic cell line for cultivating a rice sterile line or reducing rice fertility is also within the scope of protection of the present invention.
- a second object of the invention is to provide a method of growing a transgenic plant.
- the method provided by the present invention is to introduce the above RNA interference vector into a plant of interest to obtain a transgenic plant; the transgenic plant is as follows 1) or 2):
- the transgenic plant obtained by the above method is also within the scope of protection of the present invention; the transgenic plant is a sterile transgenic plant or a fertile plant having reduced fertility; the plant is specifically a monocot; the monocot is further specifically rice .
- the above-mentioned fertility-reduced transgenic plants are transgenic plants in which the transgenic plants are less fertile than the target plants.
- a third object of the present invention is to provide a method of cultivating a plant of interest as a sterile mutant or a fertility-reducing mutant.
- the method provided by the invention comprises the following steps:
- the mutagenized plant seed is obtained by mutagenizing a plurality of plant seeds with sodium azide to obtain a mutagenized seed
- the primer pair B designed to specifically amplify a triterpene synthase encoding gene in a plant of interest is a primer pair B designed for specific amplification according to a triterpene synthase encoding gene in the plant of interest, the marker Primer pairs of fluorescent labels are labeled with different fluorescent labels for each of the primers B, the different fluorescent labels having different wavelengths;
- the M1 generation group is selfed, and the second generation mutant M2 generation group is obtained;
- the PCR product is digested with an endonuclease CELI to obtain a corresponding digestion product of the DNA pool; 6) electrophoretic detection of each of the DNA pool corresponding to the digested product, if the DNA pool corresponding to the digested product produces a bright spot at a wavelength corresponding to the different fluorescent label, then the DNA pool corresponds to n M2 generations There are or candidate fertility-reducing mutants or infertile mutants; if the corresponding digested products of the pool do not produce bright spots at the wavelengths corresponding to the different fluorescent labels, then the n pools corresponding to the M2 generation There are no or no candidate fertility-reducing mutants or sterile mutants in a single plant; the fertility-reducing mutants are plants having lower fertility than the plants of interest.
- the genomic DNA of the n M2 generation M2 generations with or without the fertility-reducing mutant or the sterile mutant is separately mixed with the genomic DNA of the target plant as a template, and steps 4) to 5) are repeated to obtain M2. Restriction product corresponding to a single plant;
- the strain is or is a candidate for a sterile mutant or a fertility-reducing mutant; if the corresponding digested product of the M2 generation does not produce a bright spot at a corresponding wavelength of the different fluorescent marker, the M2 generation is not Or the candidate is not a sterile mutant or a fertility reducing mutant.
- the sodium azide is used to mutate the multi-grain plant seed to soak the multi-purpose plant seed in a 2 mM sodium azide aqueous solution for 6 hours;
- amino acid sequence of the triterpene synthase is sequence 2 in the sequence listing;
- the different fluorescent labels are a fluorescent label DY-682 having a wavelength of 682 nm and a fluorescent label DY-782 having a wavelength of 782 nm;
- the nucleotide sequence of the triterpene synthase encoding gene is specifically the sequence 5 in the sequence listing;
- the primer pair B is any one of the following 1) -3):
- the plant of interest is a monocotyledon; the monocot is a monocotyledonous plant; and the monocotyledonous plant is specifically rice.
- the above-mentioned fertility-reducing mutant is a mutant having less fertility than the plant of interest.
- the target plant is specifically rice, and the fertility-reducing mutant is specifically a mutant having less fertility than rice.
- the above fertility-reducing mutant has the accession number CGMCC NO. 6150.
- the use of the above-described transgenic plants or the above-described sterile mutants or fertility-reducing mutants in hybrid seed production is also within the scope of the present invention.
- the fertility-reducing mutant is a mutant having less fertility than the plant of interest, the plant of interest is a monocot; the monocot is a monocotyledonous plant; the monocotyledonous plant is specifically rice; In a specific embodiment, the fertility-reducing mutant is specifically a mutant having less fertility than rice.
- a fourth object of the present invention is to provide a method for obtaining a sterile mutant or a fertility reducing mutant.
- the method provided by the present invention is to silence or inactivate a triterpene synthase encoding gene in a plant of interest to obtain a sterile mutant or a fertility-reducing mutant; the fertility-reducing mutant is less fertile than the target plant Plant.
- the plant of interest is a monocot or a dicot; the monocot is a monocotyledonous plant;
- the monocotyledonous plant is rice, wheat, barley, sorghum or corn;
- the amino acid sequence of the rice triterpene synthase is sequence 2 in the sequence listing;
- the nucleotide sequence of the rice triad synthase encoding gene is the sequence 5 in the sequence listing;
- the amino acid sequence of the triterpene synthase of the wheat is the sequence 15 in the sequence listing;
- the nucleotide sequence of the triglyceride encoding gene of the wheat is the sequence 14 in the sequence listing;
- the amino acid sequence of the triterpene synthase of the barley is the sequence 17 in the sequence listing;
- the nucleotide sequence of the triterpene synthase encoding gene of the barley is the sequence 16 in the sequence listing;
- amino acid sequence of the sorghum triterpene synthase is the sequence 18 in the sequence listing;
- nucleotide sequence of the sorghum triterpene synthase encoding gene is the sequence 19 in the sequence listing;
- amino acid sequence of the triterpene synthase of the maize is the sequence 20 in the sequence listing; the nucleotide sequence of the triglyceride-encoding gene of the maize is the sequence 21 in the sequence listing.
- the above-mentioned method for silencing or inactivating a triterpene synthase-encoding gene in a plant of interest may specifically adopt a method for RNA interference of a triterpene synthase-encoding gene in a plant of interest or a triterpene synthase-encoding gene in a plant of a point mutation;
- the triterpene synthase encoding gene in the silenced or inactivated rice is at least one of the following 1) -3):
- a fifth object of the present invention is to provide a method for restoring or improving the fertility of a starting plant.
- the method provided by the present invention comprises the steps of: maintaining a plant inflorescence growth humidity of 80-100% during the flowering period of the starting plant; and the starting plant is a sterile mutant or a fertility reducing mutant.
- the sterile mutant or the fertility-reducing mutant is the above-described transgenic plant or the above-described sterile mutant or fertility-reducing mutant.
- the time for maintaining the plant inflorescence growth humidity is 1 week;
- the method for maintaining the humidity of the plant inflorescence is to wrap the entire inflorescence of the starting plant; the package is specifically covered with a plastic bag over the entire inflorescence or the cling film covers the entire inflorescence.
- the above-mentioned screened fertility-reducing mutant P34E8 is a 0s0SC8 mutant strain (ie, mutant S6), which was deposited on May 28, 2012 at the General Microbiology Center of the China Microbial Culture Collection Management Committee. Called CGMCC, the address is: No. 3, No. 1 Beichen West Road, Chaoyang District, Beijing, China. The deposit number is CGMCC No. 6150, and the classification is Rice Oryza sa tiva.
- Figure 1 shows the results of western blot analysis of RNAi strain proteins.
- Figure 2 shows the statistical results of the natural seed setting rate and the seed setting rate after moisturizing treatment of the RNAi strain.
- Figure 3 is an electropherogram of the detected mutant
- Figure 9 shows the amplification of fragments of homologous genes in barley and wheat.
- Figure 10 is an alignment of the homologous protein sequences of 0s0SC8 in grass crops and possible effective mutation sites. The best way to implement the invention
- the materials, reagents and the like used in the following examples are commercially available unless otherwise specified.
- the quantitative tests in the following examples were repeated three times, and the results were averaged or averaged.
- the amino acid sequence of the rice triterpenoid synthase 0s0SC8 protein is the sequence 2 in the sequence listing; the nucleotide sequence of the gene encoding the protein is the sequence 5 in the sequence listing.
- the primers were as follows: Primer pair Invitrogen company gateway technology was used to add the attBl sequence at the 5' end of the sense strand primer, and the attB2 sequence was added to the 5' end of the antisense strand primer.
- Primer pair 1 sense : 5 ' -AAAAAGCAGGCTGGCTGCACGGATAGAGTT-3 ' (sequence 3 )
- ant i sense 5 ' - AGAAAGCTGGGTGCCTGTATGGCTGAGAAA- 3 ' (sequence 4)
- Trollius and sphagnum 11 Orazy sa tiva L. ssp japonica; Recorded in Zhong_Hai Ren et al., 2005, A rice quantitative trait locus for salt tolerance encodes a sodium transporter. Nature Genetics 37, 1141 - 1146; public available from Chinese science Institute of Plant Research)) Total RNA, reverse transcription to obtain cDNA
- PCR amplification of primer pair 1 was carried out to obtain fragment 1 having a size of about 200 bp; after sequencing, the nucleotide sequence of fragment 1 was sequence 1 in the sequence listing; primer pair 1 was 2 pmol, PCR Mix (Genestar Al 12-01) 10ul, cDNA 2ul, add water to 20ul, PCR program 94 °C for 3 minutes, 30 cycles (94 °C 30 seconds, 55 °C 30 seconds, 72 °C 30 seconds), 72 °C, 10 minutes.
- the obtained fragment 1 was equimolar mixed with the PD0NR221 vector (invitrogen 12535-037), and incubated at 25 degrees for 1 hour to carry out a BP reaction (invitrogen 11789-020) to generate an entry vector, heat-shocked to transform Escherichia coli DH5 a, coated Transformants were obtained by culturing overnight on LB plates containing 50 mg/L kanamycin (simple principle: since the original plasmid PD0NR221 contains a lethal gene ccd B, its transformants cannot survive, only the ccdB gene is replaced with an exogenous fragment. Colonies can grow).
- BP reaction procedure After incubation for 1 h at 25 °C, add 1 ⁇ l of protease ⁇ , mix and incubate at 37 °C for 10 min. The transformants were subjected to colony PCR, and PCR amplification with primer pair 1 will result in a 200 bp PCR product band. Single colonies were saved as positive clones.
- the positive cloned plasmid was taken and sequenced.
- the positive cloned plasmid was the vector obtained by inserting the sequence 1 in the sequence listing into the pD0NR221 vector, and named pD0NR/osc8_l.
- LR reaction procedure After incubating for 1 h at 25 °C, add 2 ⁇ l of protease mash, mix and incubate at 37 °C for 10 min to extract the plasmid of single colony in the transformant, and send it to sequencing. The result is the name of the plasmid contained in the transformant monoclonal. Is shown in the sequence 1 of the sequence listing of the sequence 1 in the sequence listing of the reverse insertion of the pH7GWIWG2 (II) vector, which is inserted into the sequence of the pH7GWIWG2 (II) vector, pH7GWIWGII-osc8-l
- the DNA molecule is the RNA interference vector.
- OsOSCS RNA interference vector acquires fertility plants with reduced fertility
- the clock interference vector pH7GWIWGI I-osc8-1 obtained from the above was transformed into Agrobac terium tumefaciens EHA105 by electric shock at 1800V (KL Piers et a., 1996, Agrobacterium tumefaciens-mediated transformation of yeast. PNAS February 20, vol. 93 no. 4 1613-1618; The public can obtain the transformants from the Institute of Botany, Chinese Academy of Sciences.
- the transformant monoclonal was picked and identified by PCR (using primer pair 1 amplification) to obtain a 200 bp fragment positive clone, named EHA105/pH7GWIWGI I-osc8-1, 15% glycerol_80 °C preservation.
- RNA interference empty vector was obtained from wild type rice by Agrobacterium, and RNAi-CK-3 was transduced into vector.
- Table 1 is the medium formula
- Table 2 shows AAM-AS medium
- Table 3 is a large number of element formulas.
- Table 4 is a micro formula.
- Table 5 is the organic formula.
- Table 6 is the other formula C 1 00; fiber; 200 ⁇ 1
- the TO-generation RNA obtained in the above 2 interferes with the booting of the transgenic rice, the young ears of the liquid blistering period are taken.
- the protein was extracted and detected by Western blot (antibody with antibody 0s0SC8 protein; rabbit serum obtained by immunizing rabbit with 0s0SC8 protein; also monoclonal antibody of OsOSCS protein prepared by Shanghai Aibimar.) 0s0SC8 protein content.
- RNAi_CK_3 transgenic vector rice
- TO RNA interference transgenic rice is a mutant obtained by silencing the expression of 0s0SC8 gene in rice by RNA interference.
- Seed set rate percentage of full grain to total number of seeds (full number of grains + number of empty grains);
- T0 RNA interference transgenic rice obtained by RNA interference with 0s0SC8 gene expression in rice has reduced fertility compared with wild type rice; more transgenic plants can be screened to obtain sterile transgenic rice.
- Primer pairs designed to specifically amplify the gene according to the rice triterpene synthase encoding gene OsOSCS the sequences are: Primer pair 2: forward primer 0s0SC8TlF: GAGGTCAAGTCGTCTTCTGCAATTA (sequence 6); reverse primer 0s0SC8TlR: ATTTGTCTGCGCTCTGCACATG (sequence 7);
- Primer pair 3 forward primer 0s0SC8T13F: GCTTAAAGGTAAATTTCAGGCTTCC (sequence 8); reverse primer 0s0SC8T13R: CGATCAGAATCAATTAAACCCAGAC (sequence 9);
- Primer pair 4 forward primer 0s0SC8T17F: TCATCCTTAGATTAATTAGCCGACA (sequence 10); reverse primer 0s0SC8T17R: CATAAGGATCTCATAAAATCGACCA (sequence 11);
- the different primers in each of the above primer pairs are labeled with fluorescent labels of different wavelengths; the fluorescent labels of different wavelengths are fluorescent dye DY-682 (Eurofins DNA Campus Ebersberg, Germany) with a wavelength of 682 nm and fluorescent dye DY- with a wavelength of 782 nm. 782 (Eurofins DNA Campus Ebersberg, Germany).
- the mutagenized seeds obtained above were rinsed with water, and planted in the field to obtain the first generation mutant M1 generation group; the first generation mutant M1 generation group was selfed to obtain the second generation mutant M2 generation group; the second generation mutant M2 generation group Self-crossing, harvesting and preserving M3 generation mutant population seeds.
- the seeds of the second-generation mutant M2 generation group were randomly planted with 12 strains of each M2 generation mutant population, and the genomic DNA of each of the second-generation mutant M2 generation populations was extracted; The genomic DNA of four M2 generation plants were mixed (equal mass mixing) to obtain a DNA pool; the DNA concentration was detected and quantified, and the DNA concentration was uniformized.
- PCR amplification was performed using primer pairs 2, 3, and 4, respectively, to obtain three kinds of PCR amplification products; the procedures and systems for PCR amplification were as follows:
- the denatured sample at 85 °C was released on ice for 10 min after 10 min.
- the image of the above electrophoresis result is processed by Adobe Photoshop 8. 0, the mode is changed from a 16-bit channel to an 8-bit channel, the picture is rotated, the picture is set to be 20 cm wide, 27 cm high, and the ratio is canceled. Then adjust the brightness and contrast, and finally save it in JPEG. Analysis by Gelbuddy was observed at 682 nm and 782.
- Electrophoresis detection of each of the spirit pool corresponding to the digestion product, determining a fertility-reducing mutant or a sterile mutant if the pool corresponding to the digested product produces a bright spot at a wavelength corresponding to the different fluorescent label, then the DNA pool The corresponding n M2 generations have or may have a fertility-reducing mutant or a sterile mutant; if the corresponding digested product of the pool does not produce a bright spot at a wavelength corresponding to the different fluorescent label, then None or none of the n M2 generations corresponding to the pool have no fertility-reducing mutants or sterile mutants; the fertility-reducing mutants are plants having lower fertility than the plants of interest.
- the above method can directly determine whether the triterpene synthase encoding gene produces a point mutation: if the DNA pool corresponding to the digested product produces a bright spot at a wavelength corresponding to the different fluorescent label, the triterpene synthase encoding gene in the DNA pool Producing or candidate generating a point mutation; if the DNA pool corresponding to the digested product does not produce a bright spot at a wavelength corresponding to the different fluorescent label, the triterpene synthase encoding gene is not produced or the candidate does not produce a point mutation in the DNA pool .
- the genomics of the four M2 plants corresponding to any of the DNA pools identified above with the sterile mutant or the fertility-reducing mutant are respectively associated with the wild type rice genomic DNA (etc. Mass mixing) as a template; repeat steps 4-5 to obtain the corresponding digested product of M2 generation; recover the corresponding digested product of M2 generation, and the sample of each lane is the genomic DNA of each M2 individual
- Each PCR product corresponds to a cleavage product; each lane corresponds to a genomic DNA of a M2 plant; if the corresponding digested product of the M2 generation produces a bright spot at a corresponding wavelength of a different fluorescent marker, the M2 And the candidate is a sterile mutant or a fertility-reducing mutant; if the corresponding digested product of the M2 generation does not produce a bright spot at a corresponding wavelength of the different fluorescent label, the M2 generation Not a candidate or a candidate for a sterile mutant or a fertility-reducing
- a total of three M2 generation single-fertility mutants were screened: P34E8, 4928 and 1708, and also three The zymase-encoding gene ftsftSZ mutant was screened and the corresponding specific amplification primer pairs corresponding to the mutant were screened as follows: Primer pair 2 was used to screen P34E8, 4928, and primer pair 3 was used to screen 1708.
- Table 10 shows the location of each mutant mutation and the amino acid changes.
- amino acid and nucleotide positions in the above table are the positions of the OsOSCS protein (amino acid sequence is sequence 2) and the gene (nucleotide sequence is sequence 5) corresponding to the wild type rice.
- P34E8 is a mutation of the amino acid residue Trp of sequence 2 from the N' end of the sequence 2 in the sequence listing to a stop codon; the sequence 5 in the sequence listing is mutated from the G at the 5' end to the A;
- 4928 is to mutate the sequence 2 in the sequence listing from the amino acid residue Gly at the N' end to the Glu; and to mutate the sequence 5 in the sequence listing from the G at the 5' end to the A;
- 1708 is to mutate the sequence 2 in the sequence listing from amino acid residue Gly at position 477 of the N' end to Lys; and to mutate sequence 5 in the sequence listing from G at position 531 of the 5' end to A;
- the above-selected mutant P34E8 is a 0s0SC8 mutant strain, which was deposited on May 28, 2012 at the General Microbiology Center of China Microbial Culture Collection Management Committee (CGMCC, Address: No. 3, No. 1 Beichen West Road, Chaoyang District, Beijing) ), the deposit number is CGMCC No. 6150, and the classification is rice Oryza sa ti va.
- the above-mentioned fertility-reduced mutant P34E8 (S6) seed was planted in a glass greenhouse at 18 ° C / 25 ° C (night / day) in a natural light. Growth conditions: Temperature 18 ° C / 30 ° C (night / day), humidity 30% -50%, natural light.
- Mutant P34E8 and wild-type rice were observed during vegetative growth (50-70 days after sowing), both of which grew normally, with 3-5 tillers, and mutant P34E8 showed no abnormal traits.
- mutant P34E8 S6
- wild-type rice began to flower, and the mutant P34E8 and wild type were observed in terms of inflorescence traits, florets morphology, number and size of floral organs.
- mutant P34E8 (S6) has normal conical inflorescences and oblong florets, and the florets have a complete set of floral organs: 1 outer scorpion, 1 inner scorpion, 6 stamens, 1 pistil (with two splits) Feather-like stigma), 2 pieces of pulp, flower organ size development (see Figure 4, B, C, D), no change compared with wild type.
- the mutant P34E8 (S6) and wild type rice pollen were stained with iodine-potassium iodide (potassium iodide 3 g, lg iodine, diluted to 300 ml). After 5 minutes, observe under a microscope (microscope model: OLYMPUS BX51). The staining results showed that both the mutant and the wild-type pollen turned blue and black, indicating that the starch accumulation was normal (see Fig. ⁇ E, F).
- the mutant P34E8 (S6) and wild-type pollen were stained with Alexander (refer to Alexander MP., 1969, Stain Technol, 44: 117-122).
- the staining method was stained with iodine-potassium iodide. The staining results showed that both the mutant and the wild-type pollen were stained purple, indicating that the pollen was viable (see Figure 6, 6, H).
- Mutant P34E8 (S6) and wild-type rice pollen were tested for viability in vitro, specifically pollen was cultured in the following culture medium: 20% sucrose, 10% PEG4000, 40 mg/L boric acid, 3 mmol/L nitric acid Calcium, 3mg/L vitamin Bl.
- Detection method Drop 2-3 drops of culture solution on the slide, take the anther in the culture solution when the flower is just about to open, and use the pointed tweezers to crush the anther, pinch the large anther wall, cover the glass The tablets were placed in a large petri dish covered with moist gauze (moisturizing), cultured in a 30 ° C incubator, and observed after 30 minutes.
- Mutant P34E8 (S6) and wild-type pollen were tested for viability on the stigma by in vivo germination. Tannins are ⁇ -1, 3-glucan, usually distributed in the screens of higher plants, newly formed cell walls, flowers In the powder and pollen tubes, after being dyed with water-soluble aniline blue, yellow to yellow-green fluorescence can be emitted under ultraviolet light excitation. Therefore, the ovary stained with aniline blue after pollination was observed under a fluorescence microscope, and the state of pollen germination on the stigma, the development of the pollen tube, and the deposition of enamel on the surface of the stigma were observed, and the pollen and stigma were judged. Whether it is friendly.
- Fig. 6 The observation results are shown in Fig. 6. It indicates that some pollen grains adhered to the wild type at 5 min after pollination, and the pollen grains increased with time. The pollen tube began to extend at 20 min, and the pollen tube entered the ovule at 60 min. However, in the corresponding time, the mutants showed little or no adhesion to the stigma, further demonstrating that the fertility of the mutant P34E8 (S6) was reduced due to the decreased ability of pollen to adhere to the stigma or pollen grains. Does not adhere to the stigma.
- mutant P34E8 (S6) pollen grains did not adhere to the stigma caused by the pollen grains themselves, or caused by stigma changes
- mutant P34E8 (S6) has a lower fertility than the wild type rice, and the decrease in fertility is caused by a decrease in the ability of the pollen to adhere to the stigma or the inability of the pollen grains to adhere to the stigma.
- the mutant triterpene synthase encoding gene can lead to a decrease in rice fertility, and therefore, the TILLING screening method can be used to obtain fertility-reducing rice, and even to obtain sterile rice.
- the following experiment used M3 generation seeds of the fertility-reducing mutant P34E8.
- RNAi-9, RNAi-12, RNAi_20, RNAi-21 obtained in the above Example 1 were used.
- the TO-generation RNA interference transgenic rice and the mutant P34E8 (S6) obtained from Example 2 were sown; during the flowering stage of rice (the 80th day to the 100th day after sowing, the flowering stage), the rice inflorescence growth humidity was maintained at 80-100.
- the flowering order of the inflorescences of rice is from top to bottom.
- the entire inflorescence flowering period is about 1 week.
- the wrapped plastic bags or plastic wrap should be removed in time, because the water vapor will accumulate during the package, and the humidity will be too late. The strong effect is not good.
- the wild-type rice ZH11, the RNAi-9, RNAi_12, RNAi_20, and RNAi-21 obtained from Example 1 interfered with the transgenic rice after moisturizing treatment.
- the moisturizing rate was shown in Figure 2, and the wild type rice ZH11 was implemented.
- the sensitization rate of the RNA-resistant transgenic rice of RNAi-9, RNAi_12, RNAi_20 and RNAi-21 obtained in Example 1 after moisturizing treatment was 89.9 ⁇ 1.8%, 78.9 ⁇ 11.3%, 60.2 ⁇ 3.9%, 85.2 ⁇ 16.18, respectively.
- RNAi_9, RNAi-12, and RNAi-20 RNAi-21 without moisturization was only 42.1 ⁇ 15.3%, 37.9 ⁇ 3.9%, 18.6 ⁇ 16.1, 81.1 ⁇ 6.1%.
- Mutant P34E8 (S6) The sturdy phenotype after moisturizing treatment is shown in Fig. 8. It can be seen that the mutant P34E8 is greatly improved after moisturizing treatment.
- the seed setting rate of the mutant P34E8 was 76.25% ⁇ 3.88% after moisturizing treatment, while the seed setting rate of the mutant P34E8 without moisturizing treatment was only 1.85% ⁇ 0.49%. It is indicated that maintaining the humidity of rice inflorescence growth can restore fertility or improve fertility.
- Hybrid Rice Seeds The fertility-reducing mutants 4928 and P34E8 obtained in Example 2 and the wild type rice Zhonghua 11 and rice 9311, respectively (Jun Yu, Songnian Hu, Jun Wang, Gane Ka-Shu Wong, .... Jian Wang, Lihuang Zhu, Longping Yuan, Huanming Yang. A draft sequence of the rice (Oryza sativa ssp. indica) genome. Science. 296: 79-92, 2002; public available from the Institute of Botany, Chinese Academy of Sciences) Seeding and matching, each group consisting of 30 mutant plants, and a suitable amount of wild-type plants planted at intervals to provide pollen, with 3 replicates.
- the fertility-reducing mutants 4928 and P34E8 (S6) were separately planted and self-crossed, with 30 trees in each group and 3 replicates as control group. Artificial powdering is carried out during the flowering period from 2012.8.20 to 2012.9.1.
- the specific method is: gently tapping the wild type rice inflorescence 5-10 times with a bamboo shoot about 2 meters long, so that the pollen is scattered to the mutant inflorescence, 11 per day. Points and 1 point each time, the control group did not process.
- mutant 4928 and P34E8 (S6) is 7.45 and 12.84, and the hybrid seed setting rate is 22.32%-31.81%. It is estimated that the yield per mu is about 200-300 kg, indicating that the mutant can be used. For hybrid rice breeding.
- Example 5 Estimation of homologous genes and functions of 0s0SC8 derived from other plants
- the RT-PCR product of wheat and the RT-PCR product of barley were sent for sequencing.
- the results were as follows:
- the gene for the RT-PCR product of wheat was named /3 ⁇ 4ft3 ⁇ 47, which has the nucleotide sequence of sequence 14 in the sequence listing, from 2280
- the base of the open reading frame (0RF) is 1-2280 bases from the 5' end
- the protein encoded by the gene is TaOSCl
- the amino acid sequence of the protein is shown by the sequence 15 in the sequence listing.
- the nucleotide and amino acid sequence similarities were 84.32% and 85.18%, respectively.
- the gene name of the RT-PCR product of barley is ⁇ 3 ⁇ 47, which has the nucleotide sequence of sequence 16 in the sequence listing, consisting of 2280 bases; its open reading frame (0RF) is from position 1-2280 at the 5' end.
- the protein encoded by this gene is HvOSCl, the amino acid sequence of the protein is shown in SEQ ID NO: 17 in the sequence listing; the similarity between nucleotide and amino acid sequence is 81.58% and 81.35%, respectively, compared with 0s0SC8.
- homologous gene of OsOSCS may be very conserved in monocotyledonous plants, according to the genome-wide sequence information of sorghum bicolor L. and maize (zea may L.) (http://phyto5.phytozome.net /), the putative coding sequences of the homologous genes SrOSCl and ZmOSCl were obtained.
- amino acid sequence derived from sorghum bicolor L. SrOSCl protein is the sequence 18 in the sequence listing, and the coding gene of the protein is the sequence in the sequence listing 19;
- the amino acid sequence derived from the maize (zea may L.) ZmOSCl protein is the sequence 20 in the sequence listing, and the gene encoding the protein is the sequence 21 in the sequence listing.
- the above-mentioned coding gene can be obtained by artificial synthesis.
- TaOSCl source wheat
- HvOSCl source barley
- SrOSCl protein derived from sorghum
- ZmOSCl protein derived from corn
- TaOSCl source wheat
- HvOSCl source barley
- SrOSCl protein derived from sorghum
- ZmOSCl protein derived from Genetic silencing of maize
- the experiments of the present invention prove that the present invention provides various methods for preparing a sterile line or a fertility-reducing strain; including RNA interference or TILLING (Targeting Induced Local Lesions IN Genomes) technology screening; these methods are all directed to silent triple-combination Enzyme-encoding gene expression is achieved; the invention also provides methods for restoring or improving fertility.
- the sterile lines prepared by the method of the present invention laid the foundation for rice heterosis and cross breeding.
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CN109618917B (zh) * | 2019-02-02 | 2022-09-06 | 福建农林大学 | 一种长粒香型抗病优质黑米三系不育系的选育方法 |
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CN110079534A (zh) * | 2019-04-04 | 2019-08-02 | 华南农业大学 | 调控玉米开花期的基因、启动子及其应用 |
CN110079534B (zh) * | 2019-04-04 | 2021-04-23 | 华南农业大学 | 调控玉米开花期的基因、启动子及其应用 |
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