Abstract

                                A diallel technique was employed in which ten varieties of rice were crossed among themselves in all possible combinations. A total of 90 hybrids and ten parents was studied. The analysis for combining ability was significant for all the characters which indicated the presence of both additive and non-additive gene actions. The GCA variances were higher than SCA variances which revealed the predominance of additive gene actions for all the characters. Significant gea effects for plant height. panicle length, number of grains per panicle and straw yield per plant were shown by Co.20 whereas TKM 6 showed significant effects for earbearing tillers par plant, Jaya for 100 grain weight, Dee-geo- Woo-gen (Dg Wg) for grain yield per plant and grain-straw ratio, Basmati 370 for grain length, 1-geo-tze (igt) for grain width and SLO 16 for length-width ratio of grain. No specific cross combination was found desirable for all the characters as indicated by their sca effect but the combinations involving Jaya and Dg Wg with Basmati 370 and TKM 4 were found generally good for grain yield, short stature and fine quality of grain.

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