Resumen

MENDEZ AGUILAR, Reinaldo et al. Identification of sources of resistance to root rots in germplasm of serrano pepper (Capsicum annuum L.). Rev. Mex. Cienc. Agríc [online]. 2015, vol.6, n.7, pp.1507-1518. ISSN 2007-0934.

In Mexico production losses in pepper (Capsicum spp.) caused by infection of Phytophthora capsici Leo, has reached up to 100% in specific areas from the Bajio and Puebla, so it has been lay out to face the phytosanitary problem through the search of genetic resistance in serrano pepper accessions obtained from collections in different regions. In the present study the SCAR marker OpD04.717 was used to identify sources of resistance to the pathogen at molecular level, the accessions were considered resistant to P. capsici when amplified at band of 717 bp. Also reaction tests to P. capsici under in vitro conditions with strain PCT-17 previously isolated were carried out and the survival rate from 142 pepper accessions plus two checks (SCM334, resistant and MIRASOL susceptible to fungus) was obtained. The accession that showed greater resistance to strain was BGS41 compared to SCM334. Serrano pepper accessions with resistance to P. capsici were identified by in vitro test reactions. Not being able to identify sources of resistance to the fungus at molecular level in serrano pepper accessions could be due to the presence of an allele marker associated with resistance locus in a given accession / population does not necessarily imply the same association in different accessions. Serrano pepper accessions with potential use as new sources of resistance to root rot (P. capsici) were identified for traditional breeding programs but not for marker-assisted selection (MAS) through OpD04.717.

Palabras llave : Phytophthora capsici Leo.; accessions; SCAR marker OpD04.717.

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