CN113322266B - Application of rice OsRHD1-1 gene in rice male sterile line cultivation - Google Patents
Application of rice OsRHD1-1 gene in rice male sterile line cultivation Download PDFInfo
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Abstract
本发明公开了水稻OsRHD1‑1基因在水稻雄性核不育系培育中的应用。本发明通过设计OsRHD1‑1基因的敲除靶点构建基因敲除载体,并在水稻中进行遗传转化,发现OsRHD1‑1基因功能的丧失能够导致花粉不育,有助于新型雄性核不育系的培育,助力杂交育种的发展。
The invention discloses the application of rice OsRHD1-1 gene in the cultivation of rice male sterility lines. The present invention constructs a gene knockout vector by designing a knockout target of the OsRHD1-1 gene, and performs genetic transformation in rice. It is found that the loss of the function of the OsRHD1-1 gene can lead to pollen sterility, which is helpful for a new male male sterile line The development of cross-breeding is facilitated.
Description
Technical Field
The invention relates to the technical field of bioengineering, in particular to application of a rice OsRHD1-1 gene in cultivation of a rice male sterile line.
Background
Rice is one of the most important food crops in the world, and how to improve the yield of the rice to meet the increasing food demand is a problem to be urgently solved at present. Because the cultivated land area and the fresh water resource in China are limited, the method for improving the yield per unit of rice is a main way for improving the yield of rice. Factors influencing the yield per unit of rice are many, and intrinsic genetic characteristics influencing the tillering number of each plant, the grain number per ear and the grain weight of the rice are rice yield determining factors; external factors, including abiotic stresses such as illumination, temperature, water and salinity, and biotic stresses of diseases and insect pests have important influence on single birth; in addition, human factors also play a key role in the yield per unit of rice, such as cultivation modes, fertilization modes, pest control levels and the like.
The high yield of rice can not be separated from the excellent variety, and the breeding of the excellent variety can not be separated from the effective breeding method. Currently, rice breeding methods include conventional breeding and molecular breeding. Conventional breeding includes systematic breeding, cross breeding and mutation breeding; the molecular breeding comprises molecular marker-assisted selective breeding, transgenic breeding and molecular design breeding. However, molecular breeding is still greatly limited in application due to the problems of high cost, safety concerns, and incomplete discovery and functional research of major agronomic trait genes of rice. At present, systematic breeding is still the main breeding method, and the application of cross breeding is very wide, thereby greatly improving the yield of rice in China.
The crossbreeding is a breeding method which utilizes two rice subspecies with genetic difference to carry out hybridization, the excellent characters of the two selected subspecies can be complemented, and the progeny can generate heterosis. At present, the cross breeding method comprises a three-line method and a two-line method. The three-line method comprises a sterile line (a nucleoplasm interaction male sterile line and a male genic sterile line), a maintainer line and a restorer line; the two-line method comprises a sterile line (a temperature-sensitive male sterile line and a photosensitive male sterile line) and a restorer line. The three-line sterile lines currently used in China are mainly II-32A, gold 23A, Zhenshan 97A, gang 46A and Longtepu A; the sterile line of the two-line method mainly comprises Y58S and Petai 64S. Therefore, the cultivation of the sterile line plays a key role in the development of the hybrid rice industry. However, the poor quality of the sterile line is an important reason for the poor yield and quality of hybrid rice, so that the cultivation of the sterile line with good rice quality, strong stress resistance and good combining ability is a problem which needs to be solved urgently at present.
In Arabidopsis thaliana, Schiefelbein et al (J.W.Schiefelbein and C.Somerville.1990.genetic Control of Root Hair Development in Arabidopsis thaliana plant Cell,2(3):235-243.) reported that the Arabidopsis thaliana ROOT HAIR DEFECTIVE 1(AtRHD1, At1G64440) gene has an important regulatory role in the Development of Root hairs, and the Atrhd1 mutant shows abnormal Root Hair initiation.
Through sequence alignment analysis, 4 homologous genes with functions similar to that of AtRHD1 exist in rice and code UDP-glucose/galactose epimerase, but no report on the function of the genes for regulating rice pollen development exists.
Disclosure of Invention
The research result of the application shows that the OsRHD1-1 gene (LOC-Os05g51670) plays a key role in pollen development. As OsRHD1-1 is a nuclear gene, and pollen abortion can be caused by knocking out the gene in rice, the OsRHD1-1 can be used as a breeding material for breeding a novel rice male nuclear sterile line, can provide a hybrid combination of excellent varieties for rice hybrid breeding, and further improves the quality and the yield of rice.
Application of rice OsRHD1-1 gene in breeding male sterile line of rice. Preferably, the base sequence of the rice OsRHD1-1 gene is shown as SEQ ID NO. 1.
The invention also provides a cultivation method of the rice male sterile line, which knocks out the OsRHD1-1 gene of rice.
Preferably, the method for cultivating the rice male sterile line comprises the following steps:
(1) constructing a gene knockout vector, wherein the gene knockout vector is a plant expression vector with a sequence for knocking out a rice OsRHD1-1 gene;
(2) and (2) introducing the gene knockout vector obtained in the step (1) into rice cells to knock out the OsRHD1-1 gene of the rice, and culturing to obtain a rice male sterile line.
Preferably, the plant expression vector is pYLCRISPR/Cas9Pubi-H。
When transforming a recipient plant, an agrobacterium-mediated transformation method can be adopted, and the agrobacterium can be specifically agrobacterium EHA 105. And (2) infecting rice after the gene knockout carrier is transferred into agrobacterium.
Preferably, the rice infected by agrobacterium is rice seed-induced callus. In addition to rice seed-induced callus, it may also be callus induced by a tissue sample taken from a rice plant. Or other means of growing plants after transgenesis may be used.
Preferably, the target base sequence targeted by the knockout is 5'-tcctccagcttctccaact-3'. The base sequence of the target site of gene knockout is not limited to the sequence, as long as the function of the gene is lost after the OsRHD1-1 gene of rice is knocked out.
The invention has the following beneficial effects: according to the invention, a gene knockout carrier is constructed by designing a knockout target of an OsRHD1-1 gene, and genetic transformation is carried out in rice, so that pollen sterility can be caused by loss of the function of the OsRHD1-1 gene, and the method is beneficial to cultivation of a novel male sterile line and development of assisted cross breeding.
Drawings
FIG. 1 is a diagram showing the results of the detection of OsRHD1-1 genome sequence editing of OsRHD1-1-1, Osrhd1-1-2 and Osrhd1-1-3 knockout strains.
FIG. 2 is a graph showing the comparison of florets of wild type (NIP) and knockout lines of rice (Osrhd1-1-1, Osrhd1-1-2, Osrhd 1-1-3).
FIG. 3 is a graph showing the comparison results of pollen fertility and anther of wild type (NIP) and rice knockout lines (Osrhd1-1-1, Osrhd1-1-2, Osrhd 1-1-3).
FIG. 4 is a graph showing the comparison results of pistil morphology between wild type (NIP) and rice knockout lines (Osrhd1-1-1, Osrhd1-1-2, Osrhd 1-1-3).
Detailed Description
Example 1: construction of rice OsRHD1-1 gene knockout vector and rice genetic transformation
The base sequence of the rice OsRHD1-1 gene is shown in SEQ ID NO. 1.
(1) According to the website of http:// skl.scau.edu.cn/targettign/, a specific knockout target of the OsRHD1-1 gene is designed, and the sequence is as follows:
knocking out a target: TCCTCCAGCTTCTCCAACT are provided.
And designing an expression sequence for expressing the corresponding sgRNA sequence according to the sequence of the knocked target.
(2) The pYLCRISPR/Cas9Pubi-H vector was double-digested with BsaI endonuclease from NEB (same type of endonuclease at two positions)
The system is as follows:
buffer 2. mu.L; 1 mu L of carrier; BsaI endonuclease 1 uL; ddH2O was added to a total volume of 10. mu.L.
The enzyme digestion conditions are as follows: 30 minutes at 37 ℃.
(3) Knock-out target synthesis
The primer target sequences were synthesized as follows:
595100-aFP:5’-GCCGTCCTCCAGCTTCTCCAACT-3’;
595100-aRP:5’-AAACAGTTGGAGAAGCTGGAGGA-3’。
the primer annealing system is as follows:
595100-aFP:9μL;595100-aRP:9μL;ddH2o was added to a total volume of 20. mu.L.
The annealing conditions are as follows: after 5 minutes at 95 ℃, the mixture was taken out and left at room temperature.
(4) Connection of knockout target and enzyme digestion vector
The ligation reaction was carried out using T4 ligase from Taraka as follows:
knocking out a target: 1 mu L of the solution; enzyme digestion vector: 1.5 mu L; t4 ligase buffer (T4 ligase buffer): 0.5 mu L; t4 ligase (T4 ligase): 0.5 mu L; ddH2O was added to a total volume of 5. mu.L.
The ligation reaction conditions were: 3 minutes at 10 ℃, 6 seconds at 6 ℃ (0.2 ℃ per cycle), 3 minutes at 16 ℃, 1 minute at 18 ℃, and 19 cycles from the first step to the fourth step; 15 minutes at 65 ℃; storing at 12 deg.C.
Taking the ligation product to transform escherichia coli DH5 alpha, picking PCR verification positive clone, then carrying out sequencing verification, and extracting plasmid for later use.
(5) EHA105 competent cells were removed from the freezer at-80 ℃ and Agrobacterium transformed by liquid nitrogen freeze-thaw.
And unfreezing the competent cells on ice, adding 5 mu L of target plasmid into the competent cells, uniformly mixing, placing on ice for about 30min, quickly freezing all the mixture in a centrifugal tube in liquid nitrogen for 1 min, then placing in a 37 ℃ water bath kettle for 2 min for thawing, then adding 1mL of non-resistant LB liquid nutrient medium, re-suspending the cells, placing on a shaking table at the temperature of 28 ℃ and 200rpm for resuscitation for 2 h, then coating on YEP plates (Rif (rifampicin) 50mg/L and Kan (kanamycin sulfate) 50mg/L) containing corresponding resistance, and performing inverted culture at the temperature of 28 ℃ for 2 days until single colonies grow out.
(7) Selecting the grown agrobacterium tumefaciens monoclonal, identifying the positive monoclonal by colony PCR,
(8) rice seed (Nipponbare rice) induced callus was transformed by the rapid genetic transformation of rice.
(9) Hygromycin screens resistant callus and induces differentiation to emerge, extracts differentiated seedling leaf DNA, amplifies genome target sequence sequencing to identify target point mutation conditions, and the used primers are as follows:
RHD1-1CAS-F:5’-GAAGCTAGGAAAAAGGGAAATA-3’;
RHD1-1CAS-R:5’-TCGCCCGAATACAGATATAAGT-3’。
example 2: gene editing condition of rice OsRHD1-1 gene knockout strain
In order to detect the development condition of pollen in the small flowers of the OsRHD1-1 gene knockout strain of rice, DNA of a gene editing seedling is extracted, and an amplified fragment is sent to Hangzhou Shanghai company for sequencing.
As shown in FIG. 1, the sequencing results revealed that both DNA single strands of the 3 strains sequenced were mutated.
Example 3: small anther character observation of rice OsRHD1-1 gene knockout strain
The anther of the small flower of the rice OsRHD1-1 gene knockout strain becomes small, the color becomes light and the development is poor.
As shown in FIG. 2, the traits of the florets of the OsRHD1-1 knockout line of rice obtained in example 2 were observed, and the anthers were reduced, the color was lightened, and the development was poor in the florets of the OsRHD1-1 knockout line of rice.
Example 4: pollen observation of rice OsRHD1-1 gene knockout strain
In order to detect the pollen development condition in the small flowers of the OsRHD1-1 gene knockout strain of rice, the pollen is observed by using an iodine staining method.
As shown in FIG. 3, the florets of the OsRHD1-1 knockout line of rice have no pollen and are pollen sterile.
Example 5: observation of pistil of florets of rice OsRHD1-1 gene knockout strain
In order to detect the gynoecium development condition in the small flowers of the OsRHD1-1 gene knockout strain of rice, the gynoecium morphology is observed by using an iodine staining method.
As shown in FIG. 4, the pistils of the florets of the OsRHD1-1 gene knockout line of rice develop normally.
The experimental results of the people prove that the OsRHD1-1 gene of the rice has a key role in the development of pollen with the background of Japanese fine rice, the loss of the function of the gene causes a pollenless phenotype, and the growth of pistil is not influenced.
Sequence listing
<110> Zhejiang university
<120> application of rice OsRHD1-1 gene in rice male sterile line cultivation
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aacgcctccg agctcgccat cctccgcgtc agggaactcg ccggacacaa cgccaacaac 180
ctcgacttcc gcaaggttga cctccgcgac aagcaagcgt tggaccaaat cttctcctct 240
caaaggtttg aggctgtcat ccattttgcc gggctgaaag ctgttggcga gagcgtgcag 300
aagcccctgc tttactacga caacaacctc atcggcacca tcactctcct gcaggtcatg 360
gccgcacatg gctgcaccaa gctggtgttc tcatcatccg caactgtcta cgggtggccc 420
aaggaggtgc cctgcactga agaatcccca ctttgtgcaa tgaaccccta cggcagaaca 480
aagctggtaa tcgaagacat gtgccgggat ctgcatgcct cagacccaaa ctggaagatc 540
atactgctcc gatacttcaa ccctgttgga gctcacccaa gcgggtacat tggtgaggac 600
ccctgcggca tcccaaacaa cctcatgccc ttcgtccagc aggtcgctgt tggcaggagg 660
ccggccctta ccgtctatgg aaccgactac aacaccaagg atggaactgg ggttcgtgac 720
tatatccatg ttgttgatct agcggatggt catatcgccg cgttaaggaa gctctatgaa 780
gattctgata gaataggatg tgaggtgtac aatctgggca ctggaaaggg gacatctgtg 840
ctggaaatgg ttgcagcatt cgagaaagct tctggaaaga aaatcccgct tgtatttgct 900
ggacgaaggc ctggagatgc cgagatcgtt tacgctcaaa ctgccaaagc tgagaaggaa 960
ctgaaatgga aggcaaaata cggggtagag gagatgtgca gggacctgtg gaattgggcg 1020
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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CN106011167A (en) * | 2016-05-27 | 2016-10-12 | 上海交通大学 | Application of male sterility gene OsDPW2 and rice sterility recovery method |
CN110241126A (en) * | 2019-07-03 | 2019-09-17 | 浙江大学 | Application of OsDGD2β Gene in Breeding Male Sterile Rice Varieties |
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CN106011167A (en) * | 2016-05-27 | 2016-10-12 | 上海交通大学 | Application of male sterility gene OsDPW2 and rice sterility recovery method |
CN110241126A (en) * | 2019-07-03 | 2019-09-17 | 浙江大学 | Application of OsDGD2β Gene in Breeding Male Sterile Rice Varieties |
Non-Patent Citations (4)
Title |
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GenBank:AB087745.1;佚名;《NCBI》;20080215;参见序列 * |
NCBI Reference Sequence: XM_ 015784747.2;佚名;《NCBI》;20180807;参见序列 * |
UDP-glucose pyrophosphorylase gene affects mycelia growth and polysaccharide synthesis of Grifola frondosa;Xin-Yi Zan;《International Journal of Biological Macromolecules》;20200607;第1161-1170页 * |
水稻OsYAB6和OsUGE1基因克隆与功能分析;刘慧丽;《中国科学院植物研究所博士学位论文》;20110525;全文 * |
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