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Genetic Analysis of Brown Stem Rot Resistance in Soybean

Rogers Bros. Seed Co., P.O. Box 4727, Boise, ID 83711
Dep. of Agronomy, Univ. of Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801

^* Corresponding author.

Genetic resistance of soybean [Glycine max (L.) Merr.] to Phialophora gregata (Allington and Chamberlain) W. Gains, the cause of brown stem rot (BSR), can reduce yield losses in northern USA and Canadian production regions. Although two major dominant genes have been identified, additional sources of resistance may provide higher levels of resistance and/or more stable resistance over environments. The objectives of this study were to: (i) determine the pattern of inheritance of the BSR resistance found in PI 437970 and (ii) study allelic relationships of resistance genes in PI 437970 with Rbs₁, and Rbs₂. Evaluations were conducted using a root dip inoculation method in the field and greenhouse. The F₂ and F₃ plants were classified as resistant or susceptible based on mean parental reactions. Segregating generations of the cross PI 437970 x ‘Pioneer Variety P9271’ revealed a single dominant gene conditioning BSR resistance. Crosses of PI 437970 with L78-4094 (Rbs₁ and PI 437833 (Rbs₂) each demonstrated duplicate dominant epistasis indicating a third distinct gene designated Rbs₃.

Received for publication May 31, 1988.

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