Gene effects for seed yield and its components in crosses involving exotic parents in Brassica napus
1999
Varsha, I. | Satija, D.R. | Singh, P. (Punjab Agriculture University, Ludhiana (India). Dept. of Genetics).
Six basic generations, namely, P1, P2, F1, F2, BC1 and BC2 were used to study the nature of additive, dominance, additive x additive, additive x dominance and dominance x dominance gene effects in two crosses, viz., ABU x GS63 and ABU IRMA in Brassica napus. The simple additive-dominance and digenic epistatic models were used to partition the means of six generations. In general both additive and dominance gene effects were important in the genetic control of seed yield, see weight, pod number, plant height and days to flowering in both the crosses. In addition to this all the three type of non-allelic interactions were observed for seed yield in cross ABU x GS63 and for plant height in cross ABU x IRMA. the nature of gene effects seems to be influenced by the diversity of the parents involved. Epistasis is observed for seed yield in exotic X indigenous cross. Pedigree method of hybridization seems to be effective in selection of desirable segregants. Substantial amount of dominanc effect suggests intermating in F2 and BC1 generations to release variability which can be used to identify high productive genotypes. These studies suggest that nature of gene effects depends upon the diversity of the parents involved in the crossing programme.
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