Combining ability studies using cytoplasmic genic male sterility system (cgms) in aerobic rice

Thirty hybrids generated from crossing five lines with six testers were studied alongwith parents for combining ability and gene action involved in expression of characters in aerobic rice. The gca and sca effects were significant for all the characters indicating the importance of both additive and non-additive genetic components. But it was found that there was predominance of non-additive genetic components for expression of different traits in the present set of materials. Amongst the parental lines, IR 73718-3-1 -3-3, CT-6510-24-1 -2, IR 73718-3-1 -3-3 and CT-6510 24-1 -2 were best general combiners for grain yield alongwith other traits. The most specific combiners for grain yield and other traits were IR 67684A/CT-6510-24-1-2, IR 68885A/IR 73718-3-1-3-3, IR 70372A/PSBRC 80 and IR 70369A/IR 73718-3-1-3-3.