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Yield Stability of Single Crosses and Three-way Hybrids of Grain Sorghum¹

Replicated yield trials were conducted during 3 years in Iowa to compare the responsiveness of parental lines and different types of sorghum (Sorghum bicolor L. Moench) hybrids to a range of environmental conditions. Fertile single crosses and three-way hybrids gave equivalent mean yields over nine environments, and both hybridtypes yielded significantly more than male-sterile single crosses and parental lines. Estimates of parameters that describe stability of performance over environments indicated that the three-way hybrids as a group were slightly more stable for grain yield than were the fertile single crosses. Deviations from regression were smaller for the three-way hybrids, and their average regression coefficient on an environmental index was closer to 1.0. Considerable variation for these parameters was evident among the individual hybrids, suggesting that stability of performance may be attainable with either single or three-way crosses.

Key Words: Environmental response • Genotype x environment interaction • Homeostasis

² Former Research Associate (now Lecturer, Plant Science Department, Khon Kaen University, Khon Kaen, Thailand), and Professor of Agronomy, Iowa State University, Ames, IA 50010.

Received for publication August 22, 1973.

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