The nature and magnitude of combining ability was investigated in 30 hybrids of aggregatum onion resulting from matings of three testers and ten lines in respect of yield of bulbs and six yield contributing characters. The generala and specific combining ability variances indicated the role of non-additive gane action for all the characters, suggesting that the improvement of these traits cou d be achieved through heterosis breeding. Among the parents, the line AC 863 and the tester.C 8740proved to be the best general combiners for yield. In the hybrids, no relationship could be established between per performance and sca effects and therefore more emphasis has to be laid on per se performance than on specific combining ability effects in the choice of hybrids.
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Madras Agricultural Students Union
Tamil Nadu Agricultural University
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003
Tamil Nadu, India.
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