Performance of Progeny of Adapted and Plant Introduction Soybean Lines1
- S. K. St. Martin and
- M. Asiam2
Because of the narrow germplasm base of North American soybean [Glycine max (L.) Merr.] cultivars, new germplasm must be infused into soybean breeding programs. The F3 or F4 bulks derived by crossing 12 soybean lines as females to each of four male lines were evaluated for agronomic traits and seed composition. Parental lines were chosen for maturity (late Group II-early Group III) and seed yield, and included six adapted (A) and six exotic plant introduction (PI) females and two A and two PI males. The 48 bulks, plus two check cultivars, were evaluated in five environments with three replications per environment. The objectives were to compare male and female effects on bulk performance within and between the A and PI groups, and to determine whether female ✕ male interactions occurred more frequently in association with bulks derived from A or PI parents. Bulks derived from PI males averaged 10% less in seed yield than those from A males; bulks derived from PI females yielded 4% less than those from A females. There were differences within both the A and PI female groups for all traits except seed yield. Significant components of female ✕ male interaction occurred for plant height, seed weight, and, to a lesser extent, protein percentage and lodging score. Female ✕ male interactions, whenever they occurred, were associated with bulks having at least one PI parent. There were no female ✕ male interactions for seed yield or oil percentage. In general, results were consistent with the hypothesis of primarily additive inheritance. It is likely that selection for yield per se would be the most effective method to identify parental strains that would produce superior progeny. If a testcross procedure were employed for this purpose, the results indicate that the choice of tester would not be critical.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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