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Abstract

The experiment was conducted at Plant Breeding Farm, Department of Genetics and Plant Breeding, Faculty of Agriculture, Annamalai University, Annamalainagar during 2016-2017. In the present investigation, attempts have been made to evaluate six parents and thirty hybrids through diallel mating system to study the magnitude of heterosis for different characters.Six sesame genotypes namely VRI 1, VRI 2, TMV 3, TMV 4, TMV 6 and CO 1 were selected for the study. The results revealed that the hybrid VRI 1 ´ TMV 6 possessed significant positive value for plant height at maturity and 1000 seed weight. Maximum significant positive standard heterosis was observed by the hybrids TMV 6 ´ CO 1 for number of branches per plant. The hybrid TMV 3 ´ VRI 1 had significant positive standard heterosis for seed yield per plant. Hence, from the foregoing discussion it may be concluded that TMV 6 ´ CO 1, VRI 1 ´ TMV 6 and TMV 3 ´ VRI 1 can be rated as best hybrids and the hybrids  VRI 1 ´ CO 1 and VRI 2 ´ TMV 3 can be rated as better hybrids based on the magnitude of heterosis.  This indicates that the cross can be exploited commercially for higher yield potential.

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