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This article in CS

  1. Vol. 40 No. 1, p. 281-285
     
    Received: Mar 29, 1999
    Published: Jan, 2000


    * Corresponding author(s): kellyj@msu.edu
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doi:10.2135/cropsci2000.401281x

An indirect test using oxalate to determine physiological resistance to white mold in common bean

  1. Judith M. Kolkman and
  2. James D. Kelly *
  1. Department of Crop and Soil Sciences, Michigan State University, East Lansing, MI 48824 USA

Abstract

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 ( r=0.58** ) and incidence ( r=0.57** ), and negatively correlated with yield ( r=−0.50** ) The oxalate test is an efficient method to indirectly test for physiological resistance to white mold in common bean.

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