Clustering of isoresponsive genotypes in mungbean (Vigna radiata (L.) Wilczek) using parametric and nonparametric approaches

Clustering of isoresponsive genotypes in mungbean (Vigna radiata (L.) Wilczek) using parametric and nonparametric approaches

Shanhua, Tainan AVRDC Taiwan

1988

p.169-173

SB205.M8A5 1987

Forty genotypes of mungbean (Vigna radiata (L.) Wilczek) were grown in 4 environments: the summer and kharif seasons under narrow (10 cm x 20 cm) and wide (10 cm x 30 cm) spacings in a randomized block design with three replications. Each plot had three rows of 4 m length and yield data (g) was recorded on the middle row of each plot. The data on G x E interaction was utilized for selecting desirable genotypes with respect to their pattern of responses based on parametric (regression coefficients and deviations from regression) and nonparametric approaches (standardized distance). In the parametric approach, the linear regression of 26 genotypes was found significant. For 7 genotypes regression coefficients deviated significantly from unity. ML 370 and MUM 3 had regression approaching unity with high mean performance and are, therefore, recommended for commercial cultivation. In the nonparametric approach, standardized distances for similarity of responses were estimated among 780 pairs of genotypes. The genotypes were grouped into 9 clusters. The divergent genotypes of the same cluster are recommended for use in crossing programs to generate high-yielding genotypes showing responses similar to their parents. A quantitative mathematical characterization and qualitative description of genotypes as like or unlike other genotypes by adopting nonparametric clustering procedures are suggested. [AS]

Mungbean; Proceedings of

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