Combining Ability Studies for Development of New Hybrids in Rice over Environments

Combining ability study on grain yield and its components from line x tester analysis over the locations of fivewell adapted CMS lines and twenty three testers of different eco-geographic origin revealed higher SCA variancethan GCA variance for all the traits indicating the prevalence of non-additive gene action. The lines APMS 6A, PUSA 5A and CRMS 32A and testers 1096, 1005, IBL-57 and SC5 9-3 were the good general combiners foryield and its majority of the traits. IBL-57 was the only good general combiner among the male parents forearliness, dwarfness and grain yield per plant. The hybrids APMS 6A x SC5 9-3, APMS 6A x 1005 and APMS6A x GQ 25 were identified as potential one for yield and desired traits based on sca effects.