Sn. Sharma et al., GENETIC ARCHITECTURE OF GRAIN-YIELD IN DURUM-WHEAT UNDER DIFFERENT ENVIRONMENTS, Cereal Research Communications, 23(3), 1995, pp. 257-261
Twelve basic generations, namely, P-1, P-2, F-1, F-2, B-1, B-2, B-1s,
B-2s, B-11, B-12, B-21, and B-22 of three crosses involving six divers
e cultivars of drum wheat were studied under normal and sown condition
s to understand the nature of gene effects for grain yield. The 10-par
ameter model was adequate in most of the cases to account for the vari
ability in generation means under both the environments. Of the epista
tic effects, trigenic interactions were invariably more important than
other effects in the genetic control of yielding ability in wheat. Ad
ditive X additive X dominance (x) and dominance X dominance X dominanc
e (z) epistatic effects were contributed maximum than other effects to
wards significant heterosis. The non-allelic interactions particularly
at three gene level were predominant for this trait. Thus, a breeding
method that can mop-up the genes to form superior gene constellations
interacting in a favourable manner would be more suitable to accelera
te the pace of its genetic improvement.