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Partial resistance to anthracnose in Brazilian land races of dry beans shows race specificity
Authors:M J Havey  J C Faria  D P Maxwell  D J Hagedorn
Institution:(1) Department of Plant Pathology, University of Wisconsin-Madison, 53706 Madison, WI, USA;(2) EMBRAPA/CNPAF, Caixa Postal 179, 74000 Goiânia-GO, Brazil
Abstract:Summary Fifty-four land races of dry beans (Phaseolus vulgaris), indigenous to areas of Brazil where anthracnose (caused by Colletotrichum lindemuthianum) is a common problem, were evaluated in field nurseries for partial resistance to race Brazilian 1 (B1) of C. lindemuthianum using symptom severity classes (SSC) from 0 to 6. Plants were selected if symptoms were present and the SSC was less than the 95% confidence interval of the mean SSC of the susceptible cultivar Carioca. S1 progeny from selected plants were evaluated in air-conditioned chambers for partial resistance to races B1, delta, and kappa of C. lindemuthianum. Of 246 S1 families evaluated, 145 families were partially resistant to one or two of the races symptoms present, but S1 family mean significantly (p<0.05) less than the mean of Carioca] and susceptible to the third. Six families were partially resistant to all three races. The remaining families were either susceptible or segregated for reaction to race B1. Partial resistance to C. lindemuthianum showed race specificity in the air-conditioned chambers and field nurseries.
Keywords:Phaseolus vulgaris  dry bean  Colletotrichum lindemuthianum  anthracnose  horizontal resistance  race-nonspecific resistance  land race
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