Gene action and combining ability studies in rice

Investigation was carried out to determine gene action and combining ability studies in rice. The material consisted of F1 population of 30 crosses developed by crossing 10 genotypes with three testers. TDominance genetic variance were highly significant as compared to additive gene effects for total tillers plant-1, effective tillers plant-1, spikelets panicle-1, grains panicle-1, grain fertility, biological yield plant-1, harvest index, grain yield plant-1, 1000-grain weight and grain length and L:B ratio. The average degree of dominance was observed more than one for all the traits studied except plant height, panicle length, days to 50% flowering and days to maturity. The cross HPR 2639 x HPR 2143 is a good specific combination for grain yield plant-1, panicle length, spikelets panicle-1, grains panicle-1, biological yield plant-1, days to 50% flowering and plant height.