Combining ability study was carried out for grain vied, its component tralis, harvest index and grain protein content in a diallel sct of six diverse varieties of. durum wheat (Triticum durum Desi.) in F, and F, generations General and specif combining ability were highly significant for all the seven traits in both the gene- 10t-ons. However, the magnitude of GCA variances was much high than that of SCA variances for all the characters reflecting the predominance of additive gene effects in their genetic control. The per se performance of the parents was associated with their GCA effects. The varieties Raj 1721. Raj 2070 and Raj 1521. W best general cen.biners. Superior cicsses involved atleast cno good general combiner.
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