Utilizing heterosis

the inheritance of some rice agronomic characteristics associated with environmental genic male sterile (EGMS), twenty hybrids which produced by crossing among four lines and five testers. Analysis of variance of combining ability revealed significant differences among genotypes, crosses, lines, testers and line x tester interactions. The significant differences among the lines, testers and lines x testers indicated that the genotypes had wide genetic diversity among themselves for all traits except days to heading, chlorophyll content, panicle length and apparent heterosis for parents. Five hybrids WTSC9059S x Sakha101, WTSC9039S x Sakha102, WTSC9059S x Sakha108, WTSC9039S x Sakha108 and WTSC9039S x Sakha101 having better mean yield performance are recommended for heterosis breeding.