4 (2) 2020, APRIL 2020
Heterosis in relation to combining ability studies in sesame (Sesamum indicum L.)
Author: Shagufta Ismail, Farooq Ahmad Khan, Sidra Mubarak, Bilqees Kanwal
Category: Plant breeding
For the evaluation of combining ability and heterosis in the sesame Line x Tester design was used. The experiment was conducted during 2018 and 2019 at University of Agriculture Faisalabad (UAF). During 2018 a total of 21 crosses were developed by using seven lines and 3 testers and during 2019 seeds of parents and their twenty-one hybrids were sown in a randomized complete block design (RCBD) with three replications. Presence of variability among all the parents was observed. Highly significant differences among all the genotypes i.e. parents, crosses and parent vs. crosses were observed. Effects of both GCA and SCA were significant for all the studied parameters. Variances due to GCA and SCA were indicating the non-additive gene action for all the traits due to less value of GCA variances. The ratio of GCA / SCA was less than the unity for the seed yield reflecting the non-additive types of gene action, having the maximum influence environment on tradition of this trait. Two parents PB4 and PB10 were found to be best general combiners for seed yield. However, the cross PB4 × PB11 had the most desirable effects of SCA for the most of studied traits while PB6 × PB10 for seed yield. The cross PB6 × PB10 showed the maximum heterosis percentages for seed yield.
Keywords: Sesame, line × tester, combining ability, yield, heterosis