Heterosis and combining ability studies in rice (oryza sativa l.)

The project combining ability and heterosis in a study involving 6 parents and 15 f1 hybrids of rice revealed that among parents, nlr 33654 recorded high per se performance and desirable gca effects for grain yield per plant followed by total number of productive tillers per plant. among 15 f1 crosses, nlr 33654 x mtu 4870 recorded the high per se performance and sca effects for grain yield per plant, total number of productive tillers per plant and number of grains per panicle. The hybrid, nlr 33654 x mtu 4870 displayed high standard heterosis for number of grains per panicle, grain yield per plant, test weight, total number of productive tillers per plant and kernel l/b ratio whereas mtu 1010 x bpt 5204 displayed high standard heterosis for plant height, total number of productive tillers per plant, panicle length, number of grains per panicle, grain yield per plant, harvest index and kernel l/b ratio. character association indicated highly significant positive association of number of grains per panicle and total number of productive tillers per plant.high gcv and pcv were recorded for total number of productive tillers per plant and grain yield per plant.