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Inheritance of Certain Proteins in Soybean Seed¹

Seed proteins from most of the currently grown soybean [Glycine max, (L.) Merrill] varieties were examined by disc-electrophoresis. Two components, designated as A and B were found to be variety specific. Each variety contained one or the other, but not both. This study was conducted to determine the inheritance of these proteins. When a variety with the A seed protein was crossed with a variety with the B seed protein, the seed from the cross contained both proteins, but at lower concentrations for each than when occurring alone. Selfed F₁ plants produced F₂ seeds of A, AB and B types in a ratio of 1:2:1 respectively. Selfed F₂ plants from A and B seeds produced F₃ seeds containing their respective parental proteins. However, selfed F₂ plants from seed containing the AB protein produced F₃ seeds which segregated in a 1:2:1 ratio. The data indicate that the proteins are controlled by a pair of co-dominant genes at a single locus.

Key Words: Glycine max (L.) Merrill • genetics • codominance • polymorphism • protein variants • acrylamide-gel • electrophoresis

² Research Botanist, Field Crops and Animal Products Research Branch, and Leader, Soybean Investigations, Oilseed and Industrial Crops Research Branch, ARS, USDA, Beltsville, Md. 20705.

Received for publication February 12, 1968.