Heritabilities, Gains from Selection, and Genetic Correlations for Characteristics of Soybeans Grown in Two Row Spacings
- D. B. Weaver and
- J. R. Wilcox2
Heritabilities, gains from selection, and genetic correlations among maturity, lodging, height, and seed yield were calculated and compared for soybeans [Glycine max (L.) Merr.] in 30- and 76- cm row spacings over 2 years at West Lafayette, Ind. The primary objective was to determine if estimates of genotypic and environmental components of these characteristics that have been obtained in wide-row spacings are applicable for selection, evaluation, and production in narrow-row spacings. Experimental genotypes in both Maturity Groups II and III consisted of three adapted cultivars and 37 randomly selected F5 and F6 lines representing typical early generation breeding material.
Heritability estimates and expected responses to selection were similar for both row spacings and all characteristics except seed yield. The absence of a year ✕ genotype interaction for seed yield in narrow rows for both maturity groups resulted in a higher hcritability estimate for yield in narrow than in wide rows. This suggests more efficient selection for seed yield in narrow-row test plots when selection is based on only 1 year's evaluation. Genotype ✕ row spacing interactions for all characteristics were not significant, and genetic correlations between wide and narrow rows were approximately 1.0, suggesting that genotypes ranked similarly for all characteristics in both environments. It was concluded that there was no penalty for early generation selection and evaluation in wide-row plots with later evaluation and production in narrow rows.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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