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Yield Stability of Selected Spring Wheat Cultivars (Triticum aestivum L. em Thell) in the Uniform Regional Nurseries, 1959 to 19681¹

Yield data from Uniform Regional Spring Wheat Nurseries (URSWN) grown at 15 to 20 locations in the North-Central USA and Canada in each of the 10 years, 1959-1968, were subjected to regression analysis. Within a year, nurseries consisted of a standard set of cultivars and experimental lines. The regression of cultivar or line yield on the average yield of the nursery (b) and the mean square deviation from regression (_d²) were calculated for each cultivar or line in each of the years. Each cultivar tended to have its own characteristic value for b and for _d². We defined specific genotype-environment interaction as one which was due to a specific cause, such as susceptibility to a pathogen. The magnitude of _d² was an excellent indicator of specific genotype-environment interactions. The use of regression analysis on data from uniform regional nurseries could materially assist the plant breeder in making decisions regarding cultivar release.

Key Words: Stability parameter • Regression analysis • Genotype-environment interaction • Specific instabilities

² Research Geneticist and Research Agronomist, Crops Research Division, and Assistant Professor, Department of Agronomy, North Dakota State Univ., respectively

Received for publication August 24, 1970.

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