An indirect test using oxalate to determine physiological resistance to white mold in common bean
- Judith M. Kolkman and
- James D. Kelly *
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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