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Method for obtaining cucumber germplasm material with high powdery mildew resistance through multi-gene editing

A technology for powdery mildew and cucumber powdery mildew, applied in the fields of biotechnology and molecular biology, can solve the problems of chain burden, bad traits, huge screening workload, etc.

Pending Publication Date: 2021-05-04
HUAZHONG AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the traditional hybridization method can be used to obtain multi-gene mutants, the screening workload for constructing more than three multi-mutations or integrating multi-gene mutations with close genetic distances is very heavy, and it is easy to introduce undesirable traits due to linkage cumbersomeness

Method used

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  • Method for obtaining cucumber germplasm material with high powdery mildew resistance through multi-gene editing
  • Method for obtaining cucumber germplasm material with high powdery mildew resistance through multi-gene editing
  • Method for obtaining cucumber germplasm material with high powdery mildew resistance through multi-gene editing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] 1.1 Construction of CRISPR / Cas9 expression vector and Agrobacterium transformation

[0051] 1. Design of sgRNA

[0052] Use Geneious software to select the exon regions of CsMLO1, CsMLO8, and CsMLO11 genes (Cucumber (Chinese Long) v3Genome) for sgRNA design: the sgRNA sequence has a 5'-(N)20-NGG-3' structure (N is A, G Any one of the four bases, C, T), and the GC content is between 40% and 70%.

[0053] The cucumber CsMLO1 sgRNA sequence is shown in SEQ ID NO.4, the CsMLO8 sgRNA sequence is shown in SEQ ID NO.5, and the CsMLO11 gene sgRNA sequence is shown in SEQ ID NO.6.

[0054] 2. Primer Design and PCR Amplification

[0055] (1) Design primer sequences according to the sgRNA of CsMLO1, CsMLO8, and CsMLO11 genes. The primer sequences are as follows:

[0056] Primer name Primer sequence (5'-3') CsMLO11-F SEQ ID NO.7 CsMLO1-R SEQ ID NO.8 CsMLO1-F SEQ ID NO.9 CsMLO8-R SEQ ID NO.10 CsMLO8-F SEQ ID NO.11 VECTOR-R SE...

Embodiment 2

[0079] 2.1 Transformation of Agrobacterium

[0080] The correctly sequenced expression vector plasmid returned by Qingke Company was transformed into Agrobacterium EHA105 to prepare for the subsequent cucumber genetic transformation infection experiment. Take 2 μL of the plasmid in the ultra-clean workbench, add it to 100 μL of EHA105 Agrobacterium competent cells, flick and mix well. After mixing, ice-bath for 5 minutes, freeze in liquid nitrogen for 1 minute, and then quickly place in a 37°C water bath for 5 minutes. Add 800 μL of LB medium, and incubate at 28° C. on a shaker at 220 rpm for 2 hours. Centrifuge at 12,000 rpm for 1 min to concentrate the bacterial solution, add 200 μL LB liquid medium to resuspend, mix well, spread it evenly on LB+Kana solid medium, and culture in dark at 28°C for 2 days. Pick out the monoclonal plaques of Agrobacterium and shake the bacteria with LB+kana+rif liquid for 12 hours, and store the bacteria solution in a -80°C ultra-low temperatu...

Embodiment 3

[0090] Example 3, DNA extraction and detection of gene-edited cucumber plants

[0091] 3.1. Extraction of DNA from gene-edited cucumber plants

[0092] The DNA of the T2 generation transgenic cucumber leaves in Example 2 was extracted by using the CTAB method. The method specifically includes the following steps: take a small amount of cucumber leaves about 0.2-0.5g into a 2mL centrifuge tube, add clean steel balls and 1mL of 2% CTAB solution, and grind to powder with a sample mill (50Hz, 30s). The ground sample was placed in a water bath at 65 °C for 1 h. Invert the centrifuge tube several times during this time. Centrifuge at 12000rpm for 10min at 25°C. Pipette the supernatant (approximately 800 µL) into a new 2 mL centrifuge tube. Add an equal volume of chloroform / isoamyl alcohol (24:1) into a fume hood and mix by inverting, and centrifuge at 12000 rpm (4°C) for 15 min. Carefully draw the supernatant (about 600 μL), add it to a 2 mL centrifuge tube to which two volumes...

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Abstract

The invention provides a method for obtaining a cucumber germplasm material with high powdery mildew resistance through multi-gene editing. CsMLO1, CsMLO8 and CsMLO11 genes are enabled to produce double mutation or three mutation, or amino acids coded by the CsMLO1 gene, the CsMLO8 gene and the CsMLO11 gene are enabled to produce double mutation or three mutation together, so that the powdery mildew resistance of cucumbers is improved. Compared with the prior art, the CsMLO1 gene, the CsMLO8 gene and the CsMLO11 gene are adopted to jointly regulate and control the powdery mildew resistance of cucumbers, and a powdery mildew complete resistance material can be obtained; and compared with the prior art, the method has the advantages that common mutation of the CsMLO1 gene, the CsMLO8 gene and the CsMLO11 gene is realized by adopting a CRISPR / Cas9 multi-gene editing technology, the obtained germplasm material is a transgenic trace-free mutant material without an exogenous transgenic fragment, and the transgenic safety risk is lower.

Description

technical field [0001] The invention belongs to the fields of biotechnology and molecular biology, and specifically relates to a method for obtaining cucumber germplasm materials with high resistance to powdery mildew through multi-gene editing and the application of related recessive disease-resistant proteins and coding genes for cucumber powdery mildew. Background technique [0002] Cucumber powdery mildew is an obligate parasitic fungal disease. In recent years, under the conditions of protected cultivation, the increase of crop planting density, the increase of nitrogen fertilizer application, and the high temperature and high humidity environment have made the damage caused by powdery mildew more and more serious, seriously affecting the quality and yield of cucumber. At present, the control of cucumber powdery mildew still mainly relies on the use of chemical pesticides, which may easily cause pesticide residues and ecological environment pollution. With the improvem...

Claims

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Application Information

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IPC IPC(8): C12N15/113C12N15/29C12N15/82A01H1/02A01H5/00A01H6/34
CPCC12N15/113C12N15/8218C12N15/8282C07K14/415A01H1/02C12N2310/20
Inventor 杨丽马明茹别之龙
Owner HUAZHONG AGRI UNIV
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