Introgression of Co-42 and Co-5 anthracnose resistance genes into ‘Carioca’ Common bean cultivars
Ana Lilia Alzate-Marin, Klever Márcio Arruda, Krystyano Almeida de Souza, Everaldo Gonçalves de Barros, and Maurilio Alves Moreira
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.