1Genetics and Plant Breeding Department of Agricultural Botany, Faculty of Agriculture, Annamalai University, Annamalai Nagar-608 002, Tamilnadu, India.
2Perunthalaivar Kamaraj Krishi Vigyan Kendra, Kurumbapet, Pondicherry, India.
Five generations (P1, P2, F1, F2 and F3) of six rice crosses were grown in a randomised block design for estimating the nature and magnitude of gene effects for grain yield and its component characters. The scaling tests indicated that the scales ‘C’ and ‘D’ were significant for all the six characters in all the crosses studied. Gene effects were found to be cross specific. The results indicated the importance of duplicate dominant epistasis for number of productive tillers, number of filled grains and 100 grain weight. For biomass, grain yield and harvest index complementary recessive epistasis was found to be important.
Rice, generation mean analysis, gene effects
