Journal
PHYTOPATHOLOGY
Volume 95, Issue 3, Pages 292-299Publisher
AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/PHYTO-95-0292
Keywords
activity gels; oxalate-deficient mutant fungus; Phaseolus vulgaris; straw test
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Sclerotinia sclerotiorum is a necrotrophic pathogen that devastates the yields of numerous Crop species, including beans. The disease in common bean and pea is referred to as white mold. We examined the relationship between oxalate, an established virulence factor of S. sclerotimilm. and partial white mold resistance of scarlet Runner bean (Phaseolus coccineus). P. coccineus genotypes P1 255956 ('Mayan White Runner') and PI 535278 (Tars-046A) were more resistant than susceptible 'Wolven Pole'. Sensitivity to oxalate ranked highest for Wolven Pole, lowest for PI 255956. and intermediate for PI 535278. Oxalate concentrations were similar in infected stem tissues of the partially resistant lilies and lower than Wolven Pole. Moreover. oxalate oxidase and superoxide dismutase activities were absent in the more resistant lilies but induced in Wolven Pole. Collectively. these results suggest that genetic differences in susceptibility to S. sclerotiorum among different P. coccineus lilies are Partially dependent on oxalic acid.
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