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Classification of Environments and Genotypes in Wheat¹

Forty-one genotypes (seven cultivars and 34 breeding lines) of winter wheat (Triticum aestivum L.) were planted in eight locations in each of 2 years. Test weight data were used to group locations according to their similarity of genotype x location (GxL) effects by cluster analysis. The results indicated that deletion of only one location from the variance analysis resulted in a group within which G x L interaction was not significant. Such an analysis would be useful for the selection of testing sites for early generation testing and for development of genotypes with wide or narrow adaptability.

The cultivars were also grouped into 10 clusters with respect to their test weight similarity across the 16 environments (2 years and eight locations). Further, stability parameters, i.e., mean, regression coefficient, and deviations from regression were calculated for each genotype. Cluster analysis effectively grouped genotypes according to their stability responses. Three broad categories of genotypes were identified with respect to their stability characteristics. Cluster analysis could be a useful supplementary tool for the analysis of adaptation reactions of wheat genotypes for test weight.

Key Words: Triticum aestivum L. • Test weight • Cluster analysis • Genotype-environment interaction • Adaptation

² Assistant professor and professors, Dep. of Crop and Soil Sciences, Michigan State Univ., East Lansing, MI, 48824, respectively.

Received for publication February 14, 1980.

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