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Inheritance of a Second Gene for Brachytic Stem in Soybeans¹

The inheritance of a second gene for the control of the brachytic stem trait in soybeans, Glycine max (L.) Merr., was studied. This recessive gene, designated sb₂, was found in the brachytic-stemmed line, PI 227224, when it was crossed with the normal-stemmed cultivar, ‘Davis.’ Classification of plants in the F₁, F₂, and F₃ generations indicated two recessive gene pairs were involved in the expression of the brachytic trait. The results indicated that sb2 is at a different locus than Sb, sb. Thus, it is suggested that the first locus should now be called Sb₁, sb₁ to distinguish it from the second locus, Sb₂, sb₂.

Key Words: Glycine max (L.) Merr.

² Associate professor, Dep. of Agronomy, Univ. of Georgia, and soybean breeder, Gold Kist Seed Research.

Received for publication August 8, 1977.