数字农科院2.0

Fine Mapping Of The Major Anthracnose Resistance Qtl Anr(Go)5 In Capsicum Chinense 'Pbc932'

文献类型： 外文期刊

作者： Zhao, YY; Liu, YW; Zhang, ZH; Cao, YC; Yu, HL; Ma, WW; Zhang, BX; Wang, RS; Gao, J; Wang, LH

作者机构：

关键词： Pepper; Anthracnose; Fine Mapping; Colletotrichum Scovillei; Qtl

期刊名称： BMC PLANT BIOLOGY

ISSN： 1471-2229

年卷期： 2020 年 20 卷 1 期

页码：

收录情况： JCR（2021版）

摘要： Background Colletotrichum species are the causal agents of anthracnose, a major disease affecting the yield and quality of pepper (Capsicum spp.). Colletotrichum scovillei is widespread in China, has strong pathogenicity and drug resistance, and causes anthracnose disease in pepper fruits that severely reduces production. Previously, an anti-anthracnose locus AnR(GO)5 was mapped to the P5 chromosome on the basis of analyses of fruit at the green mature stage. The aim of this study was to narrow down the interval of this locus and identify the gene responsible for conferring resistance. Results On the basis of results of re-sequencing of Capsicum chinense 'PBC932' and C. annuum '77013', we developed Kompetitive allele-specific PCR (KASPar) markers and insertion-deletion (InDel) markers linked to AnR(GO)5 at the green mature fruit stage and used them to construct a genetic linkage map (42 markers, 24.4 cM in length). Using data obtained in phenotypic and genotypic analyses of BC4S1, BC4S2, and BC4S3 populations, AnR(GO)5 was located between the markers P5in-2266-404 and P5in-2268-978 within a physical distance of 164 kb. This region contained five genes, including CA05g17730. CA05g17730 encodes 'R1C-3-like' putative late blight resistance protein homologs. The transcript level of CA05g17730 differed between 'PBC932' and '77013'. The structure of the CA05g17730 gene also differed between 'PBC932' and '77013'. Conclusions We narrowed down the QTL interval to a region containing five genes. These results will be useful for further research on the mechanisms of resistance to anthracnose, and for marker assisted selection for anthracnose-resistant capsicum lines.

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