Analysis of Genetic Variability, Correlation and Path Co-efficient in Various Country Bean (Dolichos lablab L.) Genotypes

A b s t r a c t

Twenty-six genotypes of Country bean (Dolichos lablab L.) were Analysised for Genetic Variability, Correlation and Path Co-efficient. The genotypes were collected from Plant Genetic Resources Centre (PGRC) of Bangladesh Agricultural Research Institute (BARI), Gazipur. The study was undertaken at Sher-e-Bangla Agricultural University Farm, Dhaka to select suitable donor parents for improved breeding of Country bean. The objectives of the study were to measure the variability among the genotypes for yield and yield contributing characters, estimate genetic parameters, association among the characters and their contribution to yield. There was a great deal of significant variation for all the characters among the genotypes. High genotypic co-efficient of variation (GCV) was observed for pod width, inflorescence length, pod per inflorescence whereas low genotypic co-efficient of variation (GCV) was observed for seed width, seed length, days to first flowering. In all cases, phenotypic variances were higher than the genotypic variance. Heritability with low genetic advance in percent of mean was observed in seed width which indicated that non-additive gene effects were involved for the expression of this character and selection for such trait might not be rewarding. High heritability with high genetic advance in percent of mean was observed for pod width, inflorescence length indicated that this trait was under additive gene control and selection for genetic improvement for this trait would be effective. Correlation studies revealed that the highest significant association of yield per plant was observed with pod length, pod weight, pods per plant, inflorescence per plant. Path co-efficient analysis revealed the maximum direct contribution towards yield per plant was with pod weight followed by pods per plant, pod width and number of flower per inflorescence.

Keyword: Country bean, Genetic Variability, Correlation and Path Co-efficient.

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