Gene action and fertility restoration behavior of the tropical japonica/indica, japonica/indica derived restorers in rice ( Oryza sativa L.)

To study the gene action and fertility restoration behavior of tropical japonica/indica and japonica/indica derived advanced breeding lines, seven testers comprising new plant type i.e. NPT 2-2-694-1, NPT 9, NPT 80-1 and elite testers i.e., ET 1–12, ET 1–13, TOX 981-11-2-3 and R 12441246-1-605-1 along with three CMS lines i.e., APMS 6 A, CRMS 31 A and IR 79156 A and their generated 21 F1 crosses were evaluated for yield and yield attributing traits in a randomized complete block design (RCBD) during wet season, 2010. The phenotypic quantitative data was undertaken as per L x T analysis. The genetic analysis registered the preponderance of positive non-additive gene action for all the traits, whereas negative for flag leaf length. All the seven testers exhibited either minor or additive cytoplasmic gene action which influenced the fertility restoration behavior of different combinations of the same pollen parent. The probability of the potential restorer combination (47.76) was more followed by partial restorers (28.57), potential maintainers (19.04) and partial maintainer (4.00). The high x high allelic reaction was highest in potential restorer combinations (70.00%) followed by partial restorers (16.67%), potential maintainers (0%) and partial maintainer (0.0%). The additive x additive reaction was found for the fertility restoration in 70% restorer combinations.