Introgression of Co-42 and Co-5 anthracnose resistance genes into ‘carioca’ common bean cultivars

Abstract

Anthracnose, caused by Colletotrichum lindemuthianum, is one of the most destructive diseases to affect the common bean (Phaseolus vulgaris L.). Cultivar G 2333 is one of the most resistant cultivars, being the donor parent of genes Co-42 and Co-5 in the pyramiding breeding program of BIOAGRO/UFV. We aimed at: a) the development of resistant homozygous ‘cariocatype’ common bean lines separately carrying the Co-42 and Co-5 genes derived from G 2333, with the marker assisted selection (MAS), and b) the characterization of the resistant lines with different pathotypes of C. lindemuthianum. Thirteen lines of the ‘carioca grain type’ were selected; ten carrying the Co-42 and three the Co-5 gene, all showing resistance to the anthracnose pathotypes tested in this work. The association of adapted lines with the Co-42 gene combined with other resistance genes should provide durable resistance to this disease in Brazil and in other parts of the world.