Department of Plant Breeding & Genetics, C. S. Azad University of Agriculture and Technology, Kanpur-208 002
A 20 parent partial diallel analysis (S =9) was done in F1 and F2 generation of Indian mustard [Brassica juncea (L.) Gzern & Goss.]. The variances for general and specific combining ability were highly significant for both the generations. The estimated components of variance revealed that additive gene action was more important for days to flowering and maturity in both generations. For primary branches non-additive gene action in F1 and both additive and non-additive in F2 was observed. The higher magnitude of σ2s than σ2s and overdominance for number of secondary branches, length of main raceme, length of siliqua, number of seeds per siliqua and yield per plant indicated the presence of non-additive gene action.
Parents ‘RB 85’ and ‘A.M.’ for early flowering and maturity, ‘RL 18’ for plant height, ‘BJ 258’ and ‘E24/40’ for primary and secondary branches and ‘Varuna’ for length of main raceme, length of siliqua, seeds per siliqua and yield per plant were good general combiners.
