Utilizing heterosis and Combining ability for yield and associated traits in two line hybrid rice system

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. All traits were studied are governed by non-additive type of genes which necessitates selection in later generations for improvement. Variances of SCA were higher than the GCA variances for traits studied which indicated predominance of non-additive gene action in the inheritance of the traits.

本数据集包含与环境基因雄性不育（EGMS）相关的某些水稻农艺性状的遗传，涉及四个亲本系与五个测验系之间的杂交产生的二十个杂交种。对组合力的方差分析揭示了基因型、杂交、亲本系、测验系以及亲本系与测验系间交互作用之间的显著差异。亲本系、测验系以及亲本系与测验系间交互作用的显著差异表明，除抽穗天数、叶绿素含量、穗长和亲本的明显杂种优势外，基因型在所有性状上均表现出广泛的遗传多样性。对于平均产量性能较好的五个杂交种，即WTSC9059S x Sakha101、WTSC9039S x Sakha102、WTSC9059S x Sakha108、WTSC9039S x Sakha108和WTSC9039S x Sakha101，建议用于杂种优势育种。所有研究性状均受非加性基因型控制，这要求在后代中进行选择以实现改良。本研究性状的SCA方差高于GCA方差，这表明非加性基因作用在性状遗传中占主导地位。