School of Genetics, Tamil Nadu Agricultural University, Coimbatore 641003.
* Present address: Department of Rice, Tamil Nadu Agricultural University, Coimbatore 641003.
Combining ability analysis was done using 20 F1S and 20 F2 families obtained from a 5 X 5 diallel mating design for yield and its components, viz. dusters/plant, pods/plant, total dry matter, grain yield, harvest index, and 100-grain weight. Highly significant gca, sca and reciprocal variances were observed in both F1 and F2 generations for all the characters studied. The gca: sca variance ratio and the estimates of gca effects were similar in F1 and F2 generation for all the characters except for pods/plant. CO 4 and CO 5 were good general combiners for dusters/plant, total dry matter production, grain yield and 100-grain weight; UG 135 and UG 191 for high harvest index; and T 9 for dusters/plant.
Blackgram, Vigna mungo, combining ability
