Author(s):

SM Yadav, Ved Prakash and OP Khedar

Abstract: Generation mean analysis was carried out on six generations (P₁, P₂, F₁, F₂, BC₁ and BC₂) of three crosses namely Pusa-0871 x M-818, Pusa-0871 x RMG-991 and ML-818 x RMG-991 and evaluated in randomized block design for days to flowering, number of pods per plant, pod length, number of seeds per pod and grain yield per plant under timely and late sown conditions. The data of six generations were subjected to individual scaling tests and joint scaling test to detect epistasis. The individual scaling tests indicated the presence of epistatic interactions in all the traits under the both sowing environments. The analysis of joint scaling test indicated the additive-dominance model was inadequate in all the cases indicating the role of epistatic interactions to control the inheritance of the traits studied under both conditions. On the basis of six parameter model, both the main effects and their epistatic interactions involved in inheritance of all traits with the preponderance of non-additive effects. Complementary gene action was found in cross Pusa 0871 x RMG 991 for days to flowering in timely sown condition whereas duplicate type of epistasis was prevalent in other cases under all the environments. Reciprocal recurrent selection or bi-parental mating between the selected plants in early segregating generation could be helpful for the improvement of these traits.

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