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The AFLP (amplified fragment length polymorphisms) analysis was performed in nine Rhizoctonia solani isolates from common bean (Phaseolus vulgaris) plants collected in the states of Mexico and Veracruz, Mexico, and 17 anastomosis group (AG) testers. The corresponding AG of each isolate was determined using an in vitro assay and the pathogenicity test of each isolate on 10 common bean cultivars on in vitro conditions was performed. Cluster analysis grouped each R. solani isolate to one of three AGs: AG-2.3, AG-BI or AG-5. These grouping were confirmed by in vitro tests. Bean cultivar BAT 477 showed the highest mean severity by R. solani, while the other nine cultivars exhibited severity ratings lower than 2.0. Common bean germplasm from races Durango and Jalisco showed a higher frequency of resistance (seven to nine isolates) to R. solani than those from race Mesoamerica (five to eight isolates). Isolates 011 (AG-BI), 002, and 003 (AG 2.3) were the most aggressive in common bean seeds. The results demonstrated the close relationship between AFLP genotype and AG, but no association among AFLP genotype or AG with pathogenicity patterns in common bean, and suggest that AFLP may be useful for quick and reliable determination of the AGs in R. solani.

Palabras clave: Análisis de conglomerados, pruebas de patogenicidad.
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Universidad Autónoma del Estado de México
Sistema de Información Científica Redalyc ®
Versión 3.0 | 2018