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Using a detached-leaf bioassay technique, 505 dry bean (Phaseolus vulgaris) cultivars and lines representing seven market classes including navy, small red, pink, pinto, black, great northern, and dark red kidney bean, were screened for physiological resistance to white mold caused by Sclerotinia sclerotiorum, and gray mold caused by Botrytis cinerea. Significant differences in level of physiological resistance were detected among the materials for both pathogens. For white mold, the diameter of leaf lesion varied from small (27.1 mm) in the dark red kidney bean cultivar Redkloud to large (60.8 mm) in the great northern line L94E031. For gray mold, the diameter of leaf lesion varied from small (34.2 mm) in the navy bean line L94A010 to large (57.5 mm) in the small red line L94D196. The study showed that there is a wide range of variability in physiological resistance to both pathogens in germplasm within each market class. The study also demonstrated a significant positive correlation between lesion diameters for S. sclerotiorum and B. cinerea. The promising lines identified from this study are being used in the dry bean breeding program at the Agriculture and Agri-Food Canada Research Centre, Lethbridge, Alberta, Canada.

Palabras clave: White mold, gray mold, Phaseolusvulgaris, disease resistance.
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Universidad Autónoma del Estado de México
Sistema de Información Científica Redalyc ®
Versión 3.0 | 2018
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