Combining ability for yield component and physiological traits in hybrid rice

摘要

Combining ability estimates were obtained from line X tester analysis of crosses involving five male sterile lines and seven pollinator varieties. Predominance of non-additive gene action was observed for all the characters studied. Ponni for productive tillers per plant and total drymatter accumulation and IR 58025 A for grain yield per plant and total drymatter accumulation were identified as superior parents with high per se performance and significant gca effects. The cross combinations V 20A XIR 50400-64-1-2-2-2, PMS 10A X Ponni and IR 6829A BR 736-20-3-1 were found to be the best specific combiners. The crosses showing significant sca for grain yield per plant were obtained from good X good, good X poor, poor X good and poor X poor combinations.