Heterosis and combining ability analysis for yield and quality traits in rice (Oryza sativa. L)

Abstract

Combining ability analysis for yield and grain quality traits was carried out in rice through line x tester analysis. Thirty two hybrids were evolved by crossing 8 lines with 4 testers. Success of any plant breeding programme depends on the choice of appropriate genotypes as parents in the hybridization programme. Combining ability studies of the parents were effective in identifying better parents and provides information which helps in the selection of better parent for effective breeding programme. Combining ability analysis also provides information on gene action. The analysis of variance for combining ability showed us significant difference among parents, crosses and Line x Tester interaction for six traits of interest. General combining ability effects indicated that line L3 (K R 09009) as a good general combine for majority of the traits studied viz., 100 grain weight, high kernel length, high kernel L/B ratio and moderate panicle exsertion and kernel breadth. Among the testers, T3 (ASD-19) was adjudged as good general combiner for all the traits viz., panicle exsertion, 100 grains weight, kernel length, kernel breadth, kernel L/B ratio and grain yield per plant. The crosses L6 x T3 (RP-4353-MSC-38-43-6-2-4-3 x ASD-19), L5 x T1 (CR 2815 - 4-23-7-52-1-1x ADT38 and L5 x T3 (CR 2815-4-23-7-5-2-1-1 x ASD-19) were the best specific combiner. The hybrid L6 x T3 (RP-4353-MSC-38-43-6-2-4-3 x ASD-19) was the best hybrid based on specific combining effect for yield and quality traits.