ABSTRACT
Fava bean is one of the major domesticated and the second most cultivated species of the genus Phaseolus. Anthracnose caused by Colletotrichum truncatum affects fava bean in several stages of its development, constituting an important disease for the crop; however, only few studies confirm genotypes as source of resistance. Thus, the present study aimed to select fava bean accessions resistant to C. truncatum and to verify whether there are morpho-agronomic traits associated with resistance source through track analysis. Twenty-two accessions of Phaseolus lunatus were evaluated for their resistance to C. truncatum and were morphologically and agronomically characterized in a distinct experiment. Resistance was evaluated by visual analysis, as well as by lesion measurement with Asses 2.0 program. The morpho-agronomic characterization of the accessions was performed based on fourteen quantitative descriptors. The obtained data were jointly analyzed by track analysis in order to identify related descriptors regarding resistance to anthracnose. The genotypes UFPI 842 and UFPI 832 were confirmed as sources of high resistance to the fungus C. truncatum and presented greater averages of bean pod width. Therefore, the positive direct effect of pod width on the infection level indicates that simultaneous benefits can be obtained through a combined selection of these traits. The present results will be useful to the fava bean breeding program for allowing the development of resistant C. truncatum cultivars with excellent agronomic characteristics.
Keywords
characterization;
Colletotrichum
; fava bean; phytopathogen