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Inheritance of Pubescence Type in Soybeans: Glabrous, Curly, Dense, Sparse, and Puberulent¹

F₂ and F₃ data from crosses of soybean strains with five aberrant pubescence types and strains with normal pubescence showed that each of the five differs from normal by a single gene pair and that the five loci segregate independently. Four of these genes occur in varieties from eastern Asia: P₁ (glabrous), pc (curly pubescence), Pd (dense, three to four times the normal number of hairs), and P_s (sparse, a third to a fourth of the normal concentration of hairs); and the fifth originated as a mutant found in Iowa in 1924: P₂ (puberulent). P₁ (glabrous) appears to be epistatic to the other types, although Pd and P_s affect the density of the hair stubs visible on close inspection of glabrous plants. The genes pc and p₂, affect the form of the hairs independently of the density effects of Pd and P_s. Pd and P_s interact with each other in an additive fashion in controlling hair density. The reported linkage between P₁ p₁ and R r (seed color) was confirmed.

Key Words: Glycine max (L.) • Merrill • Gene • Linkage • Trichome • Potato leafhopper • Empoasca jabae (Harris)

² Geneticist, Crops Research Division, ARS, USDA, U. S. Regional Soybean Laboratory, Urbana, 111. 51801, and former Research Assistant, Department of Agronomy, University of Illinois, Urbana.

Received for publication July 31, 1968.