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Yield Stability in Segregating Populations of Cowpea¹

The suitability of using regression and genotype grouping methods to evaluate yield stability in segregating populations of cowpea [Vigna unguiculata (L.) Walp] was determined. F₃ and F₅ lines and bulks were used in the study. Significant genotype x environment interactions were present in both generations. The two methods identified the same lines and bulks as stable, but the genotype grouping method would be most useful when a large number of genotypes are evaluated. The yields of F₃ lines and those of related F₅ lines were well correlated (r = 0.64**, significant at 0.01 level. The mean yields of F₃ bulks and the mean yields of F₅ lines and bulks were not significantly correlated. The results showed that selection for adaptability in early generations in cowpea was possible.

Key Words: Vigna unguiculata (L.) Walp Adaptability • Genotype x environment interaction • Early generation selection

² Former graduate student [present address ICRISAT Centre Sahélien, B.P. 12 404, Niamey, Niger (Via Paris)] and senior lecturer, Dep. of Agronomy, Univ. of Ibadan, Nigeria, respectively.

Received for publication August 11, 1983.

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