Author
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Ospina Giraldo, Manuel |
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Submitted to: Meeting Abstract
Publication Type: Proceedings Publication Acceptance Date: 3/18/2004 Publication Date: 6/18/2004 Citation: Pastor-Corrales M. A., Steadman, J.R., Aime, M.C. 2004. Host gene-pool specialization and species concept in Uromyces appendiculatus and other pathogens of common bean [abstract] Phytopathology 94 (6): 124. Interpretive Summary: We have assessed genotypic diversity in a global collection of isolates of Uromyces appendiculatus, causal agent of rust of common bean, using both molecular markers and virulence assays. Phenotypic and genotypic results were congruent, indicating the existence of two different pathogen gene pools that corresponded to the Andean and Middle American gene pools of the host. Results from both virulence assays and molecular genotyping also reveal that the U. appendiculatus Andean gene pool is less diverse and has greater host- pecificity compared to the Middle American gene pool. From these results, we suggest that U. appendiculatus has specialized on each of the two different Phaseolus vulgaris host gene pools. Characterization of pathotypic and genetic variation of Colletotrichum lindemuthianum and Phaeoisariopsis griseola, the causal agents of bean anthracnose and angular leaf spot respectively, also reveals two groups of isolates corresponding to the two common bean gene host pools and demonstrating a host gene pool specialization. Technical Abstract: We have assessed genotypic diversity in a global collection of isolates of Uromyces appendiculatus, causal agent of rust of common bean, using both molecular markers and virulence assays. Phenotypic and genotypic results were congruent, indicating the existence of two different pathogen gene pools that corresponded to the Andean and Middle American gene pools of the host. Results from both virulence assays and molecular genotyping also reveal that the U. appendiculatus Andean gene pool is less diverse and has greater host- pecificity compared to the Middle American gene pool. From these results, we suggest that U. appendiculatus has specialized on each of the two different Phaseolus vulgaris host gene pools. Characterization of pathotypic and genetic variation of Colletotrichum lindemuthianum and Phaeoisariopsis griseola, the causal agents of bean anthracnose and angular leaf spot respectively, also reveals two groups of isolates corresponding to the two common bean gene host pools and demonstrating a host gene pool specialization. |
