Heterosis analysis for yield in hybrids involving new plant type and indica lines of rice (Oryza saiva L.)

Abstract

A line x tester analysis was carried out in rice with nine new plant type lines and four testers to measure the expression and magnitude of heterosis in single plant yield and nine other yield attributing characters. The study revealed that the hybrids differed significantly among themselves for all the characters. Evaluation of hybrids based on mean performance disclosed that the hybrids, L6 x T2, L9 x T4, L5 x T4, L4 x T4, L3 x T1, L1 x T2, L1 x T3, L2 x T2 and L3 x T3 were superior for most of the yield contributing traits. The hybrids, L3 x T1, L3 x T3, L1 x T2, L6 x T2 and L7 x T1 had significantly high sca effects for maximum number of traits. The hybrids were evaluated for their extent of heterosis on the basis of commercially exploitable standard heterosis for yield traits. It was inferred from the studies that cross combinations viz., L2 x T3, L3 x T1, L3 x T3, L4 x T1, L4 x T3, L4 x T4, L5 x T1, L5 x T2, L6 x T2, L8 x T2 and L9 x T4 expressed significantly superior heterosis percent for most of the characters including single plant yield. On the basis of superior mean performance, sca effects and heterosis percent, the hybrids namely, L3 x T1, L3 x T3 and L6 x T2 were suitable for involving them in heterosis breeding.