Combining ability analysis for yield and its components in hybrid rice

摘要

Thirty hybrids generated from crossing three lines with 10 testers were studied along with the parents for combining ability for days to 50% flowering, days to maturity, plant height, flag leaf length, panicle length, number of ear bearing tillers plant-1, per cent pollen sterility, number of spikelets panicle-1, number of filled spikelets panicle-1, grain yield plant-1 and harvest index. Among the male parental lines, the NDR 358 appeared, as a whole, the best general combiner for all the traits,except days to 50% flowering and plant height. Jhona 349 was the best general combiner for earliness. The female line IR 58025A was a good general combiner for grain yield plant-1 and its major components. The most promising specific combinations were IR62829A X IET 13610, IR 58025A X IET 13303, IR 62829A X IET 13386, PMS 3A X NDR 359 and PMS 3A x NDR 358 for grain yield plant-1.