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This research was planned to estimate the general and specific combining ability effects of Egyption lines to be evaluated in the rice breeding program. Fifteen hybrids were produced from a partial diallel crosses mating design among six lines, according to Griffing's1956 method 2 model 2. The six parents and their 15 F1 S were grown in a randomized complete block design with three replications at RRTC farm, Sakha kafr EL-sheikh , Egypt . Data were collected on 11 traits including agronomic, yield and its components, panicle traits and floral traits. Both GCA and SCA were found to be significant for all the studied traits except anther width and panicle length. This indicates the importance of both additive and non-additive genetic variances in determining the inheritance of most of these studied traits. The GCA/SCA ratio shows the importance of additive genetic variance in the inheritance of most traits studied .

COMIBINING ABILITY ANALYSIS IN HYBRID RICE