Author(s):

Anjana Panera, Pathak AR, Madariya RB and Barad SH

Abstract: The experimental material consisting of 55 entries comprised of ten parents and their 45 hybrids developed through half diallel mating design were evaluated in a randomized block design with three replications. Graphical and numerical approaches of diallel analysis were used to assess the nature and magnitude of gene action governing the expression of quantitative traits. The non-significance of t² values assured the ful fillment of assumptions underlying diallel analysis for all the characters except seed yield per plant. Regression coefficient (b) for five characters viz; effective length of primary raceme, number of effective branches per plant, number of capsules on primary raceme, 100-seed weight and oil content did not differ significantly from unity indicating the absence of epistasis. The estimate of components of variation revealed significant differences for D, H₁ and H₂ for all the characters except D for seed yield per plant and H₁ and H₂ for oil content, indicating importance of both additive and non-additive gene effects for the expression of various characters. However, predominance of dominance effect was observed in the expression of most of the traits except effective length of primary raceme and number of capsules on primary raceme. The positive sign of ‘F’ and more than unity ratio of K_D/K_R than unity for all the characters except shelling out turn, indicated that proportion of dominant genes were more than recessive genes. High estimates of heritability in narrow sense was observed for effective length of primary raceme and number of capsules on primary raceme.

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