| Shrnutí: | Combining ability analysis and heterosis enables plant breeders in anticipating improvement in productivity through
hybridization and selection. In this study, line × tester mating design was used to develop 42 red rice hybrids by
utilizing newly developed six WA-based CMS lines and seven testers selected from red kernel breeding lines at Zonal
Agricultural Research Station, V.C. Farm, Mandya during kharif, 2018. The phenotypic performance of hybrids along
with parents and checks were evaluated for grain yield and yield contributing traits. Analysis of variance revealed
that variance due to the line × tester was significant for almost all the characters studied. Combining ability analysis
revealed the predominance of non-additive gene action for most of the characters studied. On the basis of gca effects,
CMS 2 among the lines and MO-21 among testers were identified as good general combiners for most of the traits
studied. High sca effects were observed in the crosses, viz., CMS-1 × ME-19, CMS-2 × IET-14757 and CMS-4 × MSN-
98 and they were also found to be the best combinations for grain yield and its component traits. The crosses CMS 5
× MSN-10-3, CMS 2 × ME-19 and CMS 5 × IET-14757 exhibited high mean grain yield and high standard heterosis
over the standard commercial check KRH-4. These hybrids further need to be evaluated in multi-location trails for
commercial exploitation of heterosis in red rice hybrid breeding program.
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