Genetic architecture of Gossypium arboreum

A set of nine generations, viz. P1, P2, F1, F2, BC1, BC2, F2 X P1, F2 X P2, and F2 X F1, derived from the cross G27 x H436 of G. arboreum L. was used to estimate the type of gene effects for seed-cotton yield, fibre and other traits. The analysis of components of meansindicated prevalence of dominance gene effects for seed-callan yield, boll number per plant, and plant height. Both additive and dominance gene effects were significant for boll weight, ginning outturn, seed index and halo length, whereas for lint index, additive component was significant. For ginning outlum and seed index, the balancing of gene effects led to predominance of additive gene effects. In addition, one or more of the digenic interaction components were involved in the inheritance of all these characters except seed-cotton yield. Interactions were mostly of duplicate type.