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Institut Sophia Agrobiotech

UMR INRA - Univ. Nice Sophia Antipolis - Cnrs

Molecular Breeding

25 April 2018

Molecular Breeding
© 2017 Springer International Publishing AG.
Fine mapping of the root-knot nematode resistance gene Me1 in pepper (Capsicum annuum L.) and development of markers tightly linked to Me1


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 (Me1Me3Me7, 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 F2 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.


Pepper, Root-knot nematode, Me1, Fine mapping

Wang, X., Fazari, A., Cao, Y., Zhang, Z., Palloix, A., Mao, S., Zhang, B., Djian-Caporalino, C., and Wang, L. (2018). Fine mapping of the root-knot nematode resistance gene Me1 in pepper (Capsicum annuum L.) and development of markers tightly linked to Me1. Mol Breeding 38, 39. DOI: 10.1007/s11032-018-0793-2

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