COMBINING ABILITY FOR YIELD AND AGRONOMIC TRAITS IN HYBRID RICE DERIVED FROM WILD ABORTIVE, GAMBIACA AND KALINGA CYTOPLASMIC MALE STERILE LINES.

Four CMS lines and eight elite testers were crossed in 4 x 8 half diallel to obtain 32 hybrids. These lines were used to estimate the heterosis values, general combining ability (GCA) of parents and specific combining ability (SCA) effect for grain yield and its components. The research was conducted in November 2010 to March 2011 at Sukabumi. Thirty-two hybrids and their parental lines were planted using randomized complete block design with three replications. The characters of yield components and yield were observed. The variances due to SCA were larger than the variance due to GCA for characters plant height, panicle length, number of filled grain per panicle, number of unfilled grain per panicle, total grain per panicle, filled grain percentage per panicle and grain yield. Those characters were controlled by non-additive genes. BI485A and BI599A lines were good general combiner for number of productive tiller per plant, filled grain per panicle and filled grain percentage per panicle, while a good tester combiner were IR53942, CRS8, CRS9, SMD10 and SMD15. The yielding character was controlled by overdominant gene action, dominant x dominant or epistasis. The highest specific combining ability for grain yield was achieved by BI855A/SMD11. The best hybrid rice derived from WA male sterile lines was BI485A/IR53942 (10.21t/ha), while the best hybrids derivated from Gambiaca male sterile lines was BI855A/SMD11 (9.88 t/ha) and Kalinga derivated hybrid was BI665A/IR53942 (9.15 t/ha). These three new hybrids were showed the highest heterobeltiosis and standard heterosis. [ABSTRACT FROM AUTHOR]