Identification of heterotic hybrids in rice (Oryza sativa L.)

The present study was carried out to investigate the extent of standard heterosis and to identify promising hybrids with high magnitude of heterosis for yield and yield contributing traits. 32 hybrids were developed involving 8 males and 4 females through line x tester mating design. In present investigation, efforts were made to know the nature and magnitude of heterosis in the form of standard heterosis for grain yield per plant and its component traits. Heterosis for grain yield plant-1 was manifested due to the significant and positive heterosis for its components viz., number of productive tillers plant-1, panicle length (cm), panicle weight (g), spikelet fertility (%), 1000 grain weight (g). The top three heterotic combinations identified for grain yield plant-1 were CMS 64A x WGL 14, CMS 59A x JGL 11118 and CMS 23A x IET 26264.