Analysis of combining ability and heritability of quality and yield characters in two line hybrid rice (Oryza sativa L. subsp. Indica).

4 PGMS lines and 13 restoring lines of indica hybrid rice were selected to analyze the combining ability of main characters by the way of 48 incomplete diallele cross(NCⅡ)design.The results showed that: both general combining ability(gca) and specific combining ability(sca) were highly significant for all characters.The genetic additive effects were principal for milled rice length(MRL),milled rice width(MRW),milled rice thickness(MRT),chalk ratio(CR) chalkiness degree(CD),brown rice rate(BRR),1000-grain weight(GW),while the nonadditive effects were greater for milled rice rate(MRR),head rice rate(HRR),grain weight per plant(GWP).The characters were influenced greatly by restoring lines except HRR,the interaction between female and male parents had also great role in HRR and GWP.The order of narrow heritability was MRWMRLTGWMRTCDBRRMRRGWPHRR.PGMS line Shuguang612s and restoring line HR-2,Indica line 10038 were good parents with greater general combining ability,YW-2S/9311 and PA64S/ Indica 10065 were two better crosses for special combining ability in several characters.