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Crop Science Abstract -

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


This article in CS

  1. Vol. 8 No. 1, p. 44-47
    Received: Mar 25, 1967

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  1. D. E. Byth and
  2. C. R. Weber2



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 ✕ 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.

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