大白菜抗根肿病基因CRb的分离克隆与功能鉴定
[Abstract]:Cruciferae root swelling is a worldwide disease caused by (Plasmodiophora brassicae Woron) infection of Brassica brassica, which seriously endangers the normal production of cruciferous crops. The CRb gene is located in the 23.67Mb-23.75Mb region of Chinese cabbage A3 linkage group. In this study, the CRb gene was isolated and cloned and its function was identified by map cloning. The main results are as follows: fine mapping of 1.CRb gene and screening of candidate genes: CRb gene was mapped by RCA method. 1142 F2 susceptible individuals were screened with codominant markers TCR79 and TCR74, and 44 recombinant strains were obtained. Two newly developed InDel markers and one SSR marker, two co-dominant marker TCR30, TCR37 and one dominant marker TCR108 were used to identify the genotype of the recombinant. Finally, the CRb gene was located in the region of 0.07cM. Three markers of cosegregation with CRb gene were obtained. Through sequence information alignment, two genes, CRbl and CRb2, which can encode TIR-NBS-LRR class disease resistance proteins were identified as candidate genes. The cloning and structure analysis of 2.CRb candidate genes were carried out. The modified RACE method was used to clone CRb candidate genes. The CRbl gene of 3630bp and the. NCBI conserve domain search of CRb2 gene of 3669bp were obtained to predict the protein structure of two candidate genes. Both genes can encode TIR-NBS-LRR protein. The results showed that the protein structures of the two candidate genes were different between disease-resistant and susceptible materials. 3.CRb candidate gene expression analysis: the expression of candidate genes CRbl and CRb2 in leaves, petioles, hypocotyls and roots of disease-resistant and susceptible materials were analyzed. The results showed that candidate genes were expressed in all of the four tissues, and the relative expression levels were different between disease-resistant and susceptible materials. However, the relative expression of CRbl and CRb2 in the root system showed the same trend. Construction and functional identification of 4.CRb candidate gene plant expression vector: two CRb candidate gene plant expression vectors were constructed by restriction endonuclease digestion. Agrobacterium tumefaciens mediated genetic transformation of Arabidopsis thaliana 6 CRb1 Arabidopsis transgenic lines and 12 CRb2 Arabidopsis transgenic lines were obtained. The disease index of transgenic plants with two candidate genes was lower than that of wild-type Arabidopsis thaliana. Phylogenetic analysis of 5.CRb1 and CRb2: by amplification of candidate genes in different materials of Brassica, the results showed that CRb1 and CRb2 existed only in A genome. Phylogenetic analysis of the two genes showed that both CRb1 and CRb2 genes were homologous in 19 resistant materials, and the homology of CRbl in 19 resistant materials was higher than that of CRb2 in 19 resistant materials. But the homology of CRbl gene was lower than that of CRb2 gene. In conclusion, two TIR-NBS-LRR resistance genes, CRbl and CRb2;, were mapped and cloned from CRb loci by map cloning. The relative expression levels of CRbl and CRb2; genes were different in the roots of the resistant materials, but the regulatory level was the same. The identification of resistance of transgenic Arabidopsis thaliana plants showed that both CRbl and CRb2 genes could play a role in the disease resistance, and phylogenetic analysis showed that the two genes existed only in the A genome of Brassica. The homology of two genes in 19 Rhizomegaly resistant materials was high. It was concluded that the two genes were relatively conserved in the resistant materials, so they could play the role of resistance to Rhizomegaly.
【学位授予单位】:沈阳农业大学
【学位级别】:博士
【学位授予年份】:2015
【分类号】:S432.4
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