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Recombinant Inbred Line Differential Identifies Race-Specific Resistance to Phytophthora Root Rot in Capsicum annuum

August 2008 , Volume 98 , Number  8
Pages  867 - 870

O. Sy, R. Steiner, and P. W. Bosland

First and third authors: Department of Plant and Environmental Sciences; and second author: University Statistics Center, New Mexico State University, Las Cruces, NM 88003.

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Accepted for publication 26 March 2008.

A differential series is the normal method for identification of races within a plant pathogen and a host interaction. A host differential is extremely useful for phytopathological as well as breeding purposes. A set of recombinant inbred lines (RILs) were developed and characterized for race differentiation of Phytophthora root rot caused by Phytophthora capsici. The highly resistant Capsicum annuum accession Criollo de Morelos-334 was hybridized to a susceptible cultivar, Early Jalapeno, to generate the RIL population. The host differential characterized 17 isolates of P. capsici into 13 races. The establishment of a stable host differential for the P. capsici and C. annuum interaction will assist researchers in understanding the complex inheritance of resistance to Phytophthora root rot and to develop resistant cultivars.

Additional keywords:chile pepper, single seed descent, host--pathogen interaction.

© 2008 The American Phytopathological Society