Triple testcross analysis for yield and yield components in rice (Oryza sativa L.)

Triple testcross analysis involving three testers (P1, P2 and F1) and seven lines was performed to detect epistasis for plant height, days to first flowering, tillers/plant, grains/panicle, grain weight/panicle, 1000-grain weight, and grain yield/plant. Epistasis was found to contribute significantly for all the seven traits. The additive and dominance components were estimated by excluding the lines showing significant estimates for epistasis. Additive effects were the main source of variation for plant height, days to flowering, 1000-grain weight, and grain yield/plant, while dominance effects were important for 1000-grain weight, grain weight/panicle, and grain yield/plant.