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Association of Seed Coat Factors with Resistance to Rhizoctonia solani in Phaseolus vulgaris. Krishna Prasad, Research Assistant, Department of Horticulture, Iowa State University, Ames 50010, Present address of senior author: Department of Horticulture, University of Maryland, College Park 20742; Jack L. Weigle, Professor, Department of Horticulture, Iowa State University, Ames 50010. Phytopathology 66:342-345. Accepted for publication 27 August 1975. DOI: 10.1094/Phyto-66-342.

Black-seeded cultivars of Phaseolus vulgaris were resistant to Rhizoctonia solani (Thanatephorus cucumeris) infection, while most white-seeded cultivars were susceptible to both seed infection and preemergence damping-off. The seed coats of most white-seeded beans cracked readily before emergence. Extracts of white seed coats stimulated growth of R. solani. The seed coats of resistant black-seeded cultivars adhered tightly to the cotyledons. Extracts of black seed coats contained phenolic compounds that inhibited growth of R. solani.

Additional keywords: growth inhibition.