Effects of Genetic Heterogeneity Within Two Soybean Populations I. Variability Within Environments and Stability Across Environments1
- D. E. Byth and
- 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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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