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Re-Evaluation of the Inheritance of Urease in Soybean Seed¹

Soybean [Glycine max (L.) Merr.] seed from reciprocal crosses of ‘Columbia’ and ‘Williams’ were used to study the inheritance of soybean seed urease. Columbia contains the homozygous electrophoretic slow variant, while Williams contains the homozygous electrophoretic fast variant. From data collected using polyacrylamide gel electrophoresis, we demonstrate that the alleles associated with the fast and slow variants are codominant. This reverses a previous report claiming that the fast form (Eu) of the seed urease is dominant over the slow form (eu). We propose that the gene symbols be changed to Eu₁^a for the slow variant and Eu₁^b for the fast variant to reflect the change in the inheritance model.

Key Words: Glycine max (L.) Merr. • Electrophoresis

² Graduate research assistant and professor of plant genetics, Dep. of Agronomy, Univ. of Illinois.

Received for publication April 9, 1984.