Anthracnose reaction of common bean progenies derived from recurrent selection for white mold resistance

Abstract

Several diseases have contributed to limit the bean crop yield. Among the diseases white mold (Sclerotinia sclerotiorum) and anthracnose (Colletotrichum lindemuthianum) stand out. One way to reduce losses caused by both S. sclerotiorum and C. lindemuthianum is using resistant cultivars. Recurrent selection allows improving quantitative traits such as white mold resistance, as well as improve several characters simultaneously, if the selected parents have alleles for these traits. LEITE et al. (2016) and DIAS (2015) performed recurrent selection for resistance to white mold intercrossing several parents using the circulant diallel procedure and, some of them had anthracnose resistance alleles (Co-4² and Co-5). Although there was no selection for those alleles, they may have remained in the population after successive selective cycles. The objective of this study was to verify anthracnose resistance among the selected progenies in the cycle VII, VIII and IX from recurrent selection program for white mold resistance, and to identify the presence of resistance alleles Co-4² and Co-5.