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Inheritance of a Second Trypsin Inhibitor Variant in Seed Protein of Soybeans¹

Soybean [Glycine max (L.) Merrill] seeds from selfed heterozygous F₂ plants of the cross ‘Harosoy’ x P-I- 246367 and F₂ seeds from reciprocal crosses of T245 and P.I. 246367 were analyzed for electrophoretic banding patterns of SBTI-A₂ (Kunitz inhibitor). Harosoy seed has the SBTI-A₂ band at Rf 0.79 (Ti¹), T245 at Rf 0.75 (Ti³) and P.I. 246367 at Rf 0.83. Seeds having two bands produced plants in which seeds segregated in a 1:2:1 ratio whether in the F₂, F₃, or F₄ generation. All seed with only one band bred true in the next generation. These data along with data previously reported establishes that three forms of the SBTI-A₂ designated as Ti¹, Ti², and Ti³ are electrophoretically distinguishable from one another by their different Rf values of 0.79, 0.75, and 0.83, respectively. The forms are controlled by a codominant multiple allelic system at a single locus

Key Words: Glyxine max (L.) Merrill • Codominance • Electrophoresis • Kunitz trypsin inhibitor • Multiple alleles • SBTI-A₂

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

Received for publication December 13, 1976.

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