Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 19:107-109 (1979)
© 1979 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Inheritance of the Absence of the Kunitz Trypsin Inhibitor in Seed Protein of Soybeans1

J. H. Orf and T. Hymowitz2

Soybean [Glycine max (L.) Merrill] seds from reciprocal crosses of ‘Amsoy 71’ and P.I. 157440, reciprocal crosses of P.I. 196172 and P.I. 157440, and the cross P.I. 157440 x ‘Jefferson’ were analyzed using polyacrylamide gel electrophoresis to study the inheritance of the absence of the Kunitz trypsin inhibitor (SBTI-A2). Amsoy 71 has the SBTI-A2, at Rf 0.79 (Tia), Jefferson at Rf 0.75 (Tib), P.I. 196172 at Rf 0.83 (Tic), and P.I. 157440 lacks the SBTI-A2, band. The F2 and F3 data establish that the absence of the SBTI-A2, band is inherited as a recessive to the codominant alleles Tia, Tib, and Tic. The allele for absence of the SBTI-A2 band is designated ti. The homozygous recessive condition (ti ti) results in the lack of SBTI-A2. The lack of the SBTI-A2, protein was confirmed using spectrophometric assay procedures.

Key Words: Glycine max (L.) Merrill • Electrophoresis • SBTI-A2

1 Contribution from the Dep. of Agronomy, Univ. of Illinois at Urbana-Champaign, Urbana, IL 61801. Part of a dissertation submitted by the senior author to the Graduate College in partial fulfillment of the requirement for a Ph.D. degree at the Univ. of Illinois. Research supported in part by the Illinois Agric. Exp. Stn., Illinois Soybean Program Operating Board and the Illinois Crop Imp. Assoc.

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

Received for publication June 28, 1978.


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