Nature of Genetic Control and Inheritance of Resistance to Pythium Root Rot in Bean Genotypes

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Date
2010
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Otsyula Reuben Masheti
Abstract
Pythium root rot induced by several fungal species of Pythium causes up to 70% yield loss in commercial bean (Phaseolus vulgaris L) cultivars in East and Central African region. Host resistance is the least costly and most effective strategy for managing Pythium root rot, particularly for smallholder farmers. Resistant varieties have been identified but the nature of genetic control and inheritance mechanism of resistance to Pythium root rot in beans is not known. This research work was undertaken to a) determine the nature of genetic control of resistance to Pythium root rot in bean genotypes. b) Establish the inheritance of resistance mechanism to Pythium ultimum in beans, c) elucidate the relationship between root rot resistant, moderately resistant and susceptible bean genotypes to Pythium root rot and d) incorporate Pythium root rot resistance into commercial cultivar GLP 2 grown in Kenya and Uganda.
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