Genetic analysis for grain yield and its components in upland rice

摘要

Genetic architecture and combining ability for grain yield and its component traits in upland rice were studied using half diallel set involving six parents. Gene action as estimated through Hay man and Griffmg approach revealed greater importance ofnon-additive gene action for days to flower, plant height, panicle length, filled grains number plant, spikelets plant and fertility percentage. The gene action for number of tillers plant, grain yield plant and 1000-grain weight differs in both the models. Hayman approach revealed the presence of only non-additive gene action for tillers plant, grain yield plant and predominance of non-additive gene action for1000-grain weight, whereas Griffmg (1956) approach revealed the presence of additive componentin addition to non-additive component for grain yield and tillers plant and predominance of additive component for 1000-grain weight. This may be due to the presence of complementary type of interaction. Dominant alleles were predominant among the parents for days to flower, plant height, tillers plant, panicle length and fertility percent, while for other two traits (1000-grain weight and grain yield) an excess recessive alleles were indicated. The parents Annada, Cauvery, Kalakeri and Brown gora werefound to be good general combiners for grain yield and most of its components. Considering the gca effects of the parents and sea effects of the crosses, Annada/Kalakeri, Annada/Brown gora and Annada/Cauvery are suggested for isolation of high yieldinglines through pedigree method.