Abstract: Seven CMS lines and five indicate restorer lines such as Wen-hui 365 and Wen-hui 485 were chosen to analyze the combining ability of seven traits in 35 F₁ combinations by the way of genetic mating design of North Carollina Ⅱ.It was found that Wen-hui 365 was an ideal restorer line for making heterotic hybrid, and R117 and Wen-hui 485 were also valuable restorer materials, and Xin-lu A/R845 was the combination showing the highest grain yield per plant among the 35 combinations. The genetic basis of the variation of yield traits in the combinations was analyzed in a random model. The results showed that the genetic variation of the productive panicle per plant was mainly caused by the non additive effect, while those of grain yield per plant, spikelet per panicle, filled grain per panicle, 1 000-grain weight, panicle length and plant height were mainly caused by additive effects. The narrow heritabilities of plant height and 1 000-grain weight were high (80%). The narrow heritabilities of panicle length, spikelet per panicle and filled grains per panicle were medium (50%). And the narrow heritabilities of productive panicle per plant and grain yield per plant were low (8%).

Key words: rice, restorer line, agronomic characteristics, combining ability analysis