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Published in Crop Sci 20:727-730 (1980)
© 1980 Crop Science Society of America
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Inheritance of ß-Amylase Nulls in Soybean Seed1

D. F. Hildebrand and T. Hymowitz2

The soybean [Glycine max (L.) Men.] cultivar ‘Altona’ lacks ß-amylase activity (AM null 1) and the Sp1b seed protein electrophoretic band. Altona also has a genotype with ß-amylase activity and the Sp1b band (Rf 0.42). The cultivar ‘Chestnut’ lacks detectable ß-amylase activity (AM null 2), but it produces the Sp1a seed protein electrophoretic band (Rf 0.36). Seed from reciprocal crosses of Altona (AM null 1) and ‘Amsoy 71’ (Sp1a), the cross Altona (Sp1b) x Altona (AM null 1), the cross Altona (AM null 1) x ‘Corsoy’ (Sp1b), reciprocal crosses of Chestnut (AM null 2) and Altona (Sp1b), reciprocal crosses of Chestnut (AM null 2) and Amsoy 71 (Sp1a), and the cross Chestnut (AM null 2) x Altona (AM null 1) were analyzed to determine the inheritance of AM nulls 1 and 2 relative to Sp1a and Sp1b.

The F2 and F3 data establish that AM null 1 is recessive to the codominant alleles Sp1a and Sp1b for both ß-amylase activity and the seed protein band. AM null 2 is recessive to Sp1a and Sp1b for ß-amylase activity but codominant to Sp1b for the seed protein band. The symbols sp1 are proposed for the AM null 1 allele and Sp1an for the AM null 2 allele.

Key Words: Glycine max (L.) Merrill • Cultivar identification • Electrophoresis • Sp1

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

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

Received for publication February 13, 1980.




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