GENERATION MEAN ANALYSIS FOR YIELD AND ITS ATTRIBUTING TRAITS IN RICE (ORYZA SATIVA L.)

The present investigation was started from summer-2022 at Main Rice Research Centre, Navsari Agricultural University, Navsari to study the genetic parameters viz., gene action of three crosses through generation mean analysis (each having P 1 , P 2 , F 1 , F 2 and F 3 generations) in a Compact Family Block Design (CFBD) with three replications.On the basis of five parameter model, main effects viz., mean (m), additive (d) and dominance (h) and two digenic interactions, additive additive (i) and dominance dominance (l) were significant for productive tillers per plant in cross II; for panicle length (cm) in crosses II and III; for grain yield per plant (g) in crosses I and II; for kernel breadth (mm) in crosses II and III; for L:B ratio in crosses II and III and amylose content (%) in crosses I and II and for grains per panicle and 100 grain weight (g) in all the crosses indicated that involvement of additive, dominance as well as epistasis interaction for controlling these traits.The duplicate epistasis was observed for plant height (cm), grains per panicle, 100 grain weight (g), grain yield per plant (g), kernel length (mm) and kernel breadth (mm) in all the three crosses; for days to flowering in cross III; for productive tillers per plant in cross II and cross III; for panicle length (cm) in cross II; for L:B ratio in crosses II and III and amylose content (%) in cross II.While, complementary epistasis was observed for days to flowering in crosses I and II; for productive tillers per plant in cross-1; for panicle length in cross I and cross III; for L:B ratio in cross-I and for amylose content in cross I and cross III.