Abstract
Angular leaf spot (ALS), incited by the fungus Pseudocercospora griseola, is a major disease affecting common bean. Important resistance sources have been identified and characterized: AND 277, BAT 332, Cornell 49-242, MAR-2, and Mexico 54. P. griseola presents high physiological variability. The control of this kind of pathogen requires continuous evaluation, including monitoring and characterization of pathogenic variability, and eventual germplasm introgression of genes in adapted cultivars. Cultivar Ouro Negro is currently being used as an ALS resistance source in Brazil. This work aimed to characterize the ALS resistance gene present in cultivar Ouro Negro in relation to the other five resistance sources. These cultivars were crossed with ‘Ouro Negro’ (allelism tests) and with susceptible cv. Ruda (inheritance studies) and their segregation patterns were evaluated. The inheritance studies and the allelism tests indicate that ‘Ouro Negro’ harbors at least one resistance locus which is distinct from those present in the other resistance sources.
Highlights
Angular leaf spot, incited by Pseudocercospora griseola (Sacc.) Crous and Braun, is among the fungal diseases causing great damage to common bean growers (Rava, 2002)
Cultivar Ouro Negro is currently being used as an Angular leaf spot (ALS) resistance source in Brazil
P. griseola races 63.23 and 63.39 were chosen to be used in the allelism tests because they were incompatible with ‘Ouro Negro’ and with the other ALS resistance sources used in the crosses (Table 1)
Summary
Angular leaf spot, incited by Pseudocercospora griseola (Sacc.) Crous and Braun, is among the fungal diseases causing great damage to common bean growers (Rava, 2002). Stable resistance to plant pathogens with high physiological variability requires monitoring of isolates and race characterization in addition to continuous germplasm evaluation and eventual introgression of resistance genes in adapted cultivars (Young & Kelly, 1996; Iwo, Ittah, & Osai, 2012). To facilitate this process, and to identify new resistance sources, the inheritance of resistance genes needs to be determined. This study aimed to characterize the ALS resistance gene present in cultivar Ouro Negro in relation to the other five ALS resistance sources previously characterized
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