Genetics of seed yield and its attributes in Indian mustard [Brassica juncea (L.) Czern and Coss.]

Abstract

Six generations namely, P1, P2 F1, F2, BC1 and BC2 of three crosses Indian mustard [Brassica juncea (L.) Czern and Coss.], namely, RH 9608 x RWH-1 (C1), RH 9615 x RWH-I (C2) and RH 9621 x RWH-1 (C3) were raised in a compact family block design with three replications. Ten randomly selected plants each of Pl' P2 and F1, 25 plants each of F2, BC1 and BC2 generations were used for recording observations on quantitative characters namely, plant height, primary branches, secondary branches, siliquae/plant, seeds/siliqua, 100 seed weight and seed yield fplant. The data recorded were subjected to weighted analysis of Cavalli [1] to know the adequacy of additivedominance models, in the presence of epistasis, the data, where any of the 4 or 5 parameters found adequate in the model of Jink and Jones [2] was subjected accordingly to sequential model in order to obtain more precise estimates for these parameters. The adequacy of these sequential models was tested by X2 test at 2 and 1 degree of freedom, respectively.