Components of genetic variances for yield attributes in Indian mustard (Brassica juncea (L) czern and coss)

Genetic components of variance were estimated in F₁ generation of Indian mustard derived from 7 parents diallel cross (excluding reciprocals) for eight traits namely, days to flowering, days to maturity, plant height, no. of primary branches, length of main racem, seed yield/plant, 1000-seed weight and oil content. The analysis of variance reveald highly significant differences among parents and F₁ crosses for almost all the characters except length of main raceme, seed yield/plant and oil content. The interactions between parents and F₁s were also significant for all the traits except seed yield/plant and oil content. Different genetic components namely 0, H₁, H₂, F, h₂ & E and related parameters were estimated and observed the dominance components (H₁ and H₂) were higher than additive component (D) in F₁ generation. The value of F was found positive in F₁ generation except days to maturity, plant height and length of main raceme. The ration between total dominant to recessive genes (except days to maturity, plant height and 1000-seed weight) revealed that dominant genes were more prevalent than recessive genes for all characters. The proportion of genes with postive and negative effects (H₂/4H₁) were less the value 0.25 in F₁ generation for all the characters except no. of primary braches. The degree of dominance (H₁D) 0.5 were high for no. of primary branches length of main raceme and seed yield/plant.