Combining ability studies for assessment of yield and its components in sesame (Sesamum indicum L.)
Abstract
An 8 x 8 diallel cross mating design with parents and F1s was used to estimate gene action and combining ability for yield and yield characters in sesame (Sesamum indicum L.). The experiment was conducted at the AICRP, JNKVV, College of Agriculture Tikamgarh, Madhya Pradesh in kharif season. Crosses were attempted between parents in diallel mating design (without reciprocal). The genetic variance of combining ability was separated into general (GCA) and specific (SCA) combining ability variance components. The results indicated significant differences among the parents for general combining ability (gca) and crosses for specific combining ability (sca) for all the characters studied except for capsule length in F1s. While parent v/s crosses for all the characters had adequate genetic variability. However, the sca component of variance was predominant indicating the predominance of non additive gene effects for the traits studied. Among the parents, ES-230 and SI-1147 were good general combiners for seed yield per plant and its attributing traits. Estimates of gca effects in parents and F2s indicated that ES-230 and SI-775 were good general combiners for seed yield per plant and its attributing traits. The estimates of specific combining ability revealed that the crosses viz. ES-230 x NIC-8401,IS-1162 x NIC-8401,IS-1162 x MT-75,SI-1147 x SI-775, SI775 x DS-10 and SI-775 x MT-75 were the best specific combiners for seed yield per plant. The F1 hybrids showing high sca and parents having good gca will be included in breeding programme for further improvement of seed yield in sesame.
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