Combining ability and heterosis for yield and its component traits in rice

Melioration of the genetic architecture of parental lines is the prerequisite for developing high yielding rice varieties. Present investigation was focused on this purpose, comprising ten lines and three testers using line × tester mating design in a randomized block design with three replications. 30 hybrids were phenotyped for yield and its component traits along with their parents. The performance of the material was estimated based on the extent of heterosis, per se performance and combining ability. Analysis of variance with respect to total treatments revealed significant differences for all the traits studied. among the lines, HPR 2748 (P) was adjudged as the good general combiner for grain yield/plant and other traits whereas, Kasturi was adjudged to be good general combiner for grain yield/plant, plant height, panicle length, spikelets/panicle, grains/panicle, days to 50% flowering, days to maturity and grain length among three testers. The cross HPR 2755 × Kasturi was identified as the best specific combination for grain yield/plantinvolving good × good parental gca effects. Again cross combination HPR 2755 × Kasturi revealed highest heterosis over standard check for grain yield/plant. Thus, hybrid HPR 2755 × Kasturi was identified as the best combination since it exhibited desirable per se, significant sca effects and high standard heterosis for grain yield/plant