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Evidence of Nonadditive Effects and Linkage in Two Hybrid Populations of Soybeans¹

Two soybean [Glycine max (L.) Merr.] crosses were studied in the F₄, F₅, F,₆, and F₇ generations followed by the F₅, F₆, F₇, and F₈ generations in 1962 and 1963, respectively. For each cross, data were obtained from 49 lines, each represented by two random plants for each generation. A split-plot design was used to give estimates of genotypic variance and covariance based upon a hierarchical arrangement of generations. An analysis of variance of multiple regression and associated partial regression coefficients indicated that additive genetic variance was the major component of genotypic variance for all traits studied. Dominance components occurred for plant height, seed weight, and lodging, but were relatively small. Linkage components appear to be important for flowering, plant height, seed weight, and lodging.

Key Words: Genotypic variance • Genotypic covariance • Additive genetic variance • Components of genetypic variance

² Published with the approval of the Director of the Research Division, College of Agriculture and Life Sciences, University of Wisconsin, Madison, Wis. 53706. Part of a thesis submitted by the senior author partial fulfillment of the requirements for the Ph.D. degree.

Received for publication February 27, 1971.