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Effects of Genetic Heterogeneity Within Two Soybean Populations I. Variability Within Environments and Stability Across Environments¹

Two random and unselected populations of genetically heterogeneous F₂-derived, and homogeneouls F₂-derived soybean lines were evaluated for nine agronomic and chemical characters in three environments in F₆-F₇ generations. Average performance of the heterogeneous and homogeneous lines was equal across environments for all traits except maturity and plant height, which were possibly overestimated in heterogeneous populations.

F₂-derived lines revealed greater phenotypic stability across environments than F₂derived lines. This was related to the degree of genetic heterogeneity within F₂-derived lines, while genetic uniformity within F₅-derived lines resulted in large genotype x environment interactions in all characters. Also, homeostatic effects due to heterogeneity within a line were shown by lower variance among heterogeneous F₂-derived lines than for homogeneous F₅-derived lines for all characters in all environments.

Implications in selection procedures of homeostatic effects within and across environments resulting from heterogeneity within relatively homozygous soybean lines were discussed.

Key Words: soybeans • Glycine max L. Merrill • variability and environments

² Senior Lecturer, Department of Agriculture, University of Queensland, Brisbane, Australia (formerly Research Scientist, CSIRO Division of Tropical Pastures, Brisbane, and Graduate Assistant and CSIRO Student, Agronomy Department, Ames, Iowa); and Director of Research, Peterson Seed Co., Waterloo, Iowa (formerly Agronomist, Crops Research Division, ARS, USDA, and Professor of Agronomy, Iowa State University, Ames, Iowa).

Received for publication March 25, 1967.