Combining ability analysis of grain quality traits in rice (Oryza sativa L.)

Seven high yielding rice genotypes viz., ADT 41, ADT 46, CO 47, TKM 9, Jeeragasamba, ACM 98003 and AS 90033 and their 21 crosses which effected in a half diallel fashion (excluding reciprocals) were subjected to combining ability studies for grain yield and grain quality analysis. Predominance of additive genetic variance was observed for hundred grain weight, kernel length, kernel L/B ratio and kernel length after cooking whereas nonadditive genetic variance was greater for grain yield, hulling percentage, milling percentage, head rice recovery, kernel breadth, linear elongation ratio, water uptake, volume expansion ratio, alkali spreading value, amylose content and gel consistency suggesting the postponement of selection to later generation from the segregating population in pedigree breeding programme.ADT 41 and AS 90033 were good general combiners for grain yield and grain quality traits. The hybrid combinations viz., CO 47/ Jeeragasamba, ADT 41 / ACM 98003, TKM 9 / Jeeragasamba, ACM 98003 / AS 90033 and CO 47 / TKM 9 were identified as good specific combiners for grain yield and grain quality traits.

Author(s): R. P. Gnanamalar* and P. Vivekanandan

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