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Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824 USA
kellyj{at}msu.edu
In common bean (Phaseolus vulgaris L.), the detection of physiological resistance to white mold [Sclerotinia sclerotiorum (Lib.) de Bary] in the field is confounded by environmental factors and plant avoidance mechanisms. Development of a reliable screening procedure is needed to identify resistant bean germplasm and to develop resistant cultivars. The objective of this study was to determine if oxalate, a primary pathogenicity factor of S. sclerotiorum, could be used to indirectly screen for physiological resistance to white mold in common bean. Cut bean seedlings were placed in a 20 mM oxalate solution in the greenhouse. Genotypes were rated based on differences in wilting response to oxalate. Oxalate ratings of the 27 genotypes were correlated with field ratings of a white mold disease severity index
and incidence
, and negatively correlated with yield
. The oxalate test is an efficient method to indirectly test for physiological resistance to white mold in common bean.
Abbreviations: DI, disease incidence • DSI, disease severity index • RCBD, randomized complete block design
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