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Application of rice WRKY transcription factor gene OsWRKY21 in cultivation of resistant varieties of plants

A transcription factor and rice technology, applied in the field of agricultural biology, can solve the problems of failure to achieve disease resistance, difficulty in counteracting pathogenic microorganisms, long breeding cycle, etc., and achieve good disease resistance, broad-spectrum and specific protection.

Active Publication Date: 2015-06-17
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, traditional disease resistance breeding is not only limited by the lack of available resistance genetic resources, but also has a long breeding cycle, making it difficult to compete against rapidly mutating pathogenic microorganisms
However, the genetic engineering strategy of using a single functional gene to improve rice disease resistance has not achieved the desired disease resistance effect.

Method used

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  • Application of rice WRKY transcription factor gene OsWRKY21 in cultivation of resistant varieties of plants
  • Application of rice WRKY transcription factor gene OsWRKY21 in cultivation of resistant varieties of plants
  • Application of rice WRKY transcription factor gene OsWRKY21 in cultivation of resistant varieties of plants

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1 Isolation and Cloning of OsWRKY21 Gene

[0045] Using rice variety Nipponbare (Luo Linguang et al. Genotype analysis of rice male sterile line Zhenshan 97A at heading stage. Acta Genetica Sinica, 2001, 28(11)) as material, three-week-old wild rice seedlings in normal soil culture were sprayed with Using Magnaporthe grisea strain 00-193a with strong pathogenicity and high pathogenic frequency in Guangdong Province (Ouyang Dongmei et al., Genetic analysis and gene marker mapping of Basmatic370 mutant BTX resistance to rice blast. Molecular Plant Breeding, 2009,7(1)) spore suspension (10 5 1 / mL), after 24 hours, use Trizol reagent (purchased from Invitrogen) to extract total RNA from successfully inoculated rice leaves (see Trizol manual for extraction method), and use reverse transcriptase M-MLV (purchased from Invitrogen) to synthesize the total RNA by reverse transcription The first strand of cDNA (for the method, refer to the manual of reverse transcriptase)...

Embodiment 2

[0064] Example 2 Expression profile analysis of OsWRKY21 gene

[0065] Using the rice variety Nipponbare as the material, three-week-old wild-type rice seedlings in normal soil culture were sprayed with 10 5 / ml of Magnaporthe grisea 00-193a spore suspension, 2 mM salicylic acid (SA), 0.5 mM benzothiadiazole (BTH) and 100 μM jasmonic acid (JA), all solutions were spiked with 0.05% (v / v) Tween20 was used to increase the adhesion of the leaf surface; the mock control group (mock) was sprayed with solvent components in various solutions respectively. The sampling time of blast fungus induction experiment is 0h, 6h, 12h, 24h, 48h, 72h. The sampling time of SA and JA treatment experiment was 0h, 0.5h, 1h, 3h, 6h, 9h, 12h, 24h. The sampling time of BTH treatment experiment was 0h, 0.5h, 1h, 3h, 6h, 9h, 12h, 24h, 36h, 48h. The total RNA of each sample was extracted with Trizol reagent (purchased from Invitrogen) (see the instruction manual of Trizol for the extraction method), and...

Embodiment 3

[0066] Example 3 Production and identification of disease resistance of transgenic rice overexpressed with OsWRKY21 gene

[0067] The pGEM-OsWRKY21 plasmid was digested with AscI and BamHI to obtain the full-length coding frame sequence of OsWRKY21, and the obtained OsWRKY21 gene full-length coding frame sequence was inserted into Figure 5 Between the AscI and BamHI restriction sites of the pFGC 1008 vector (Kerschen et al. Effectiveness of RNA interference in transgenic plants. FEBS letters. 2004, 566(1)) shown, the specific recombination steps refer to the restriction endonuclease of TaKaRa Company Enzyme and T4 ligase instructions, transform the recombinant plasmid into Escherichia coli strain DH5α, and the clone identified as positive by enzyme digestion contains the overexpression vector of OsWRKY21 gene.

[0068]The Nipponbare embryogenic callus was used as the transformation recipient, and the OsWRKY21 gene overexpression vector was introduced into the recipient materi...

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Abstract

The invention belongs to the field of agricultural biotechnology and discloses an application of rice WRKY transcription factor gene OsWRKY21 in cultivation of resistant varieties of plants. The function of the rice WRKY transcription factor gene OsWRKY21 as shown in SEQ ID NO.1 is researched in the invention through a reverse genetics method, and the OsWRKY21 gene is detected discovered to play have a positive regulation function in the defensive reaction of rice blast resistance. The OsWRKY21 gene is cloned into a suitable plant expression vector to transform the rice, and the rice blast resistance of the obtained transgenic rice is significantly enhanced. Therefore, new varieties of rice blast resistant transgenic plants can be cultivated through the disease resistance traits of the OsWRKY21 gene modified rice and other crops.

Description

technical field [0001] The invention belongs to the field of agricultural biotechnology, and particularly relates to the application of rice WRKY transcription factor gene OsWRKY21 in cultivating plant disease-resistant varieties. Background technique [0002] Rice disease is one of the main factors leading to the decline of rice yield and quality deterioration. Breeding and popularizing disease-resistant varieties is the safest and most effective way to prevent and control rice diseases. However, traditional disease-resistant breeding is not only limited by the lack of available resistance genetic resources, but also has a long breeding cycle, making it difficult to compete against rapidly mutating pathogenic microorganisms. However, the genetic engineering strategy of using a single functional gene to improve rice disease resistance has not achieved the desired disease resistance effect. In recent years, with the in-depth understanding of the mutual recognition mechanism ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N15/82C12N15/84A01H5/00
Inventor 许新萍杨宝发金寿恒
Owner SUN YAT SEN UNIV
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