数字农科院2.0

Mapping of clubroot (Plasmodiophora brassicae) resistance in canola (Brassica napus)

文献类型： 外文期刊

作者： Zhang, H.;Sun, R.;Zhang, H.;Strelkov, S. E.;Feng, J.;Hwang, S. -F.;Falak, I.;Huang, X.

作者机构：

关键词： bulked segregant analysis;genetic markers;linkage;pathotype;QTL

期刊名称： PLANT PATHOLOGY

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年卷期：

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收录情况： SCI

摘要： Clubroot disease, caused by Plasmodiophora brassicae, has become a major problem in the production of cruciferous crops worldwide. In this study, a population of 121 doubled haploid (DH) lines derived from a crossing between a resistant and a susceptible canola (Brassica napus) genotype was subjected to phenotypic and genotypic studies to determine the inheritance and location of the resistance gene(s). After inoculation with pathotype 3 of P.brassicae, the lines showed a 1:1 segregation ratio for resistance, indicating that resistance in this population is controlled by a single gene. Fifteen PCR-based markers that were known to be linked to clubroot resistance (CR) genes were screened against genomic DNA from parents and resistant and susceptible bulks. Marker GC1680, linked to the CR gene CRa, exhibited polymorphism between the parents and between the resistant and susceptible bulks. CRa target primers were used to amplify fragments from the two parents and the resultant sequences were compared. A high degree of sequence similarity was found between the parents in the nucleotide binding site domain of CRa. In contrast, sequence polymorphisms were detected in the leucine-rich repeat (LRR) domain. One pair of primers that amplify a band from the LRR region of the resistant parent but not the susceptible parent was used to screen the DH population. Amplicons were obtained from 60 of the 61 resistant lines and two of the 60 susceptible lines; thus, three recombinants were found. Based on these results, a resistance locus linked to CRa was found.

分类号： S432.1

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