|Pastor Corrales, Marcial|
Submitted to: American Phytopathology Society
Publication Type: Abstract Only
Publication Acceptance Date: March 10, 2004
Publication Date: June 10, 2004
Citation: Pastor-Corrales, M. A., Aime M.C. 2004. Differential cultivars and molecular markers segregate isolates of Uromyces appendiculatus into two distinct groups that correspond to the gene pools of their common bean hosts [abstract]. Phytopathology 94 (6): 82. Technical Abstract: We explored the virulence and molecular diversity in a collection of isolates of the bean rust pathogen (<i>U. appendiculatus</i>) from different parts of the world. For virulence analysis we used a set of 12 common bean (<i>Phaseolus vulgaris L.) </i> differential cultivars, six each from the Andean and the Middle American bean gene pools. We also examined the genotypic diversity of these isolates using the elongation factor 1@. Phenotypic and genotypic results were congruent and revealed the existence of two different groups of isolates of <i>U. appendiculatus</i> that corresponded to the Andean and Middle American gene pools of their common bean hosts respectively. These results also revealed that the Andean group of isolates is less diverse and has greater host-specificity compared to the Middle American group. A molecular assay has been developed to rapidly identify to which group isolates of <i>U. appendiculatus</i> belong.