Author(s):

Darshan Lal, Rajeev Kumar, Anil Kumar, SK Singh, Dharmendra Kumar and Sanjeev Kumar

Abstract: The specific combining ability analysis (SCA) of 10 parents and their-45F₁’s and 45 F₂S generated through Diallel system of mating revealed that significant differences existed for specific combining ability for all the characters. SCA variances were important for all the characters indicating the presence of both additive and non-additive gene effects in controlling the expression of various characters. Cross Vardan x RH-819 (F₁) and Krishna x RH-30 (F₂) expressed higher SCA effect for higher seed yield. Cross RH-819 x RH-9304 and Rohini x Vaibhav expressed high SCA effect for oil content in both the generation, respectively. Additive gene action along with partial dominance was observed in seed yield, oil content and test weight. Varuna x RH-9801 and Vaibhav x RH-30 and Rohini x RH-9304 and Varuna x RH-9304 also exhibited desirable specific combining ability effect for earliness and late flowering. RH-9304 x RH-30 and Rohini x RGN-19 exhibited superior specific combining ability effect for length of main raceme and number of siliqua on main raceme in F₁ and F₂ generation. No. of primary and secondary branches per plant cross Vaibhav x RH-819 and Rohini x RGN-19 expressed high SCA effect in both the generation. Most of the cross involving high×low specific combining parent, exhibited high SCA effect for various traits.

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