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Inheritance of Resistance to White Mold Disease in a Diallel Cross of Dry Beans¹

The inheritance of resistance to Sclerotinia sclerotiorum (Lib.) deBary was investigated in a nonreciprocal diallel cross of six dry bean (Phaseolus vulgaris L.) lines. Data were taken on the parents and their 15 F₂ populations in greenhouse and field. Within each environment, the genotypic mean squares were highly significant and accounted for 74 and 76% of the total variation in the greenhouse and field, respectively. Partitioning the genotypic variation revealed that the line effects were highly significant, accounting for 89 and 94% of the genotypic variation in the greenhouse and field, respectively. The variation resulting from nonadditive gene action was not significant in either environment. Disease severity was greater in the greenhouse than in the field, but neither the environment x genotype, nor the environment x line interactions were significant. Resistance to S. sclerotiorum in this set of parents was quantitatively inherited and due primarily to additive gene action. A breeding strategy emphasizing recurrent selection should lead to improvements in resistance.

Key Words: Sclerotinia sclerotiorum • Additive and nonadditive gene action • Plan architecture • Disease avoidance • Physiological resistance • Testing methods

² Former research associate (present address, Pioneer Hi-Bred Int., Inc., Box 667, Napoleon, OH 43545), professor, Dep. of Horticulture and associate professor, Dep. of Plant Pathology, Univ. of Nebraska, Lincoln.

Received for publication September 8, 1983.

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