Genetic Architecture Of Yield And Yield Components In Indigenous Aromatic Rice (Oryza sativa L.)

Genetic Architecture Of Yield And Yield Components In Indigenous Aromatic Rice (Oryza sativa L.)

Parental, F1, F2, BC1 and BC2 generations of five crosses involving indigenous aromatic rice cultivars were subjected to generation mean analysis to study the genetics of seven yield and yield components. It was observed that Ä¥, î and lÌ‚ were significant for all the yield traits studied except Ä¥ for 100 – grain weight and î and lÌ‚ for plant height. Also dÌ‚ was significant for all the yield components except plant height and yield/plant. Further, ĵ was significant for plant height and main panicle length. Thus, for all the yield traits, additive and dominance gene effects as well as epistatic interactions were present indicating complex inheritance of the traits. This necessitates improvement of individual characters separately based on the nature of gene action. Exploitation of additive gene effect should be carried out following pedigree method of selection. For crosses and characters where both additive and non-additive gene effects were important, single plant selection can be postponed and biparental mating could be followed wherein a few cycles of crossing of promising segregants in F2 and onwards would help in the incorporation of desirable genes into a single genetic background. Diallel selective mating or reciprocal recurrent selection will be helpful in simultaneously exploiting both kinds of gene effects for improving the trait..