Fine mapping of the root-knot nematode resistance gene Me1 in pepper (Capsicum annuum L.) and development of markers tightly linked to Me1

文献类型： 外文期刊

第一作者： Wang, Xueying

作者： Wang, Xueying;Cao, Yacong;Zhang, Zhenghai;Mao, Shengli;Zhang, Baoxi;Wang, Lihao;Fazari, Ariane;Djian-Caporalino, Caroline;Palloix, Alain

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关键词： Pepper; Root-knot nematode; Me1; Fine mapping

期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）

ISSN： 1380-3743

年卷期： 2018 年 38 卷 4 期

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收录情况： SCI

摘要： Root-knot nematodes (RKNs) can severely damage crops, including peppers, worldwide. The application of resistance genes identified in the Capsicum annuum genome may represent a safe and economically relevant strategy for controlling RKNs. Among the Me genes (Me1, Me3, Me7, and N) that have been mapped to a cluster on chromosome P9, Me1 confers a heat-stable and broad-spectrum resistance that is difficult for virulent RKNs to overcome. In this study, we developed several closely linked kompetitive allele-specific PCR (KASPar) markers, simple sequence repeat (SSR) markers, sequence characterized amplified region (SCAR) markers, and high-resolution melting (HRM) markers for the mapping of RKN-resistance genes. Analyses of 948 individuals (BC1 and F-2 progenies) revealed that Me1 was located between SCAR marker 16880-1-V2 and HRM marker 16830-H-V2, with 13 and 0 recombination events with Me1, respectively. These markers were localized to a 132-kb interval, which included six genes. The development of several PCR-based markers closely linked to Me1 will be useful for the marker-assisted selection of RKN resistance in pepper cultivars. Among these markers, 16830-H-V2 and 16830-CAPS are present in the CA09g16830 gene, which is predicted to be a putative late blight resistance protein homolog R1A-3 gene. This gene appears to be a suitable Me1 candidate gene.

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