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A Study on combining ability and genetic parameters were conducted on 39 F1 hybrids along with sixteen rice genotypes (thirteen lines and three testers) to understand the pattern of inheritance of yield and its components for selecting superior genotypes. The experiment was carried out using line x tester mating design, during 2011 and 2012 rice growing seasons at the Lysimeter and the Experimental Farm of Rice Research and Training Center, Sakha, Kafr El-Sheikh, Egypt. Both GCA and SCA variances were found to be significant or highly significant for all studied traits. Sakha 102 and Giza 177 rice genotypes were the best general combiners due to highly significant GCA effects for number of days to 50% heading under normal conditions. Moreover, Sakha 106 was the best general combiner for number of days to 50% heading at two levels 4000 ppm (S1) and 6000 ppm (S2) of salinity. The genotype, Gaori was the best general combiner for plant height under all conditions and for number of filled grains/panicle and sterility% under normal conditions. IEET1444 was the best general combiner for number of panicles/plant, salinity index and grain yield/plant under two levels (S1 and S2) of salinity. While, Wab 880SG-33 was the best general combiners for 1000-grain weight under all conditions, and for number of filled grains/panicle under two levels(S1 and S2) of salinity. Suweon 345 was the best general combiner for number of panicles/plant under normal conditions and for sterility% under two levels (S1 and S2) of salinity. On the other hand, the crosses, IET 1444 x Sakha 104, Wab 880SG-33 x Sakha104, BG 34-8 x Giza 178 and Gz 1368-S-5-4 x Giza 178 were found to be the best cross combinations for most of the studied traits, these crosses had high and significant SCA in desirable direction under normal and two levels of salinity condition. The highest estimated values of phenotypic (Vph) and genotypic (Vg) variances were observed for number of filled grains/panicle and sterility % indicating better scope for the genetic improvement in these two mentioned traits. High broad-sense heritability, coupled with high genetic advance, were observed for number of filled grains/panicle, sterility% and plant height under normal and two levels of salinity condition, indicating the role of additive genetic variance in the expression of these traits and direct selection might be highly effective in early generations to improve these traits under normal and two levels of salinity. Highly significant positive correlation coefficients were recorded between grain yield per plant and each of number of panicles/plant, number of filled grains/panicle and 1000grain weight under normal and two levels of salinity conditions.

STUDIES ON COMBINING ABILITY FOR YIELD AND ITS COMPONENTS IN RICE USING LINE X TESTER MATING DESIGN UNDER SALINE SOIL CONDITIONS