Division of Genetics, Indian Agricultural Research Institute, New Delhi, 110 012, India
Genetic effects were estimated for grain yield, its components and some developmental traits in six crosses using means of generations, P1, P2, F1, F2, BC1 and BC2. Results indicate that the inheritance of different developmental traits, yield components and grain yield was rather complex in a majority of the crosses.
Simple additive genetic model was adequate to explain genetic variation in five out of 48 crosscombinations. These related to grain yield per plant in cross EB 533 x NP 13, grain yield per plant and synchrony of height in cross EB 533 X NP 113 and 200 grain weight in the cross BG 1 x EB 533.
Non-fixable components of epistasis, viz., additive x dominance (j) and dominance x dominance (1) were relatively more important in the inheritance of various characters. The additive x additive inter actions wherever significant were invariably associated with significant duplicate epistasis.
