Vol. 8, Issue 8 (2019)

Author(s):
Anita C Solanke, Pathik B Patel and Pooja K Patel

Abstract:
The present investigation in aromatic rice (Oryza sativa L.) was undertaken for studying the magnitude of gene action in four cross combination for grain yield and it’s contributing traits deploying generation mean analysis following six parameter model for parents (P₁ and P₂), F₁, F₂, BC₁ and BC₂ generations during three crop season. The results of the scaling tests revealed that the additive-dominance model was inadequate for all of the characters evaluated in all of the four crosses, suggested the existence of epistasis in the inheritance of these characters. Mean values of all the crosses revealed significant. On the basis of six parameters model, main effect viz., mean (m), additive (d) and dominance (h) and all three digenic interactions viz., additive x additive (i), additive x dominance (j) and dominance x dominance (l) were significant for days to flowering in cross-I (GR-104 x IET-26215); for panicle length in all crosses except cross-IV (IET-26215 x GNR-2); for 100 seed weight in cross-I (GR-104 x IET-26215) and cross-II (IET-24617 x NWGR-9081); for grain yield per plant in cross-III (IET-26214 x GAR-1); for straw yield per plant in cross-II (IET-24617 x NWGR-9081); for harvest index in cross-II (IET-24617 x NWGR-9081) and cross-III (IET-26214 x GAR-1); indicated the involvement of additive, dominance as well as epistasis interaction for controlling this trait. The duplicate type epistasis was observed in majority of all traits in all crosses. The present study demonstrates the importance of additive, dominance and epistatic gene effects for the inheritance of almost all the yield as well as quality characters studied.