G x E interaction and stability analysis in okra [Abelmoschus esculentus (L.) Moench]

Abstract

With prime objective of developing region specific as well as stable variety or hybrids of okra, the present investigation was undertaken with 72 genotypes (11 lines, five testers and their resultant 55 hybrids along with a commercial hybrid check ‘OH-102’) were sown at three different locations at Navsari Agricultural University, Navsari (Gujarat) in Kharif 2018 to obtain the information on stability parameters for fruit yield per plant and its component traits. The stability analysis exhibited significant differences among genotypes (G), environments (E), while genotype x environment interaction was reported non-significant for all traits (except seeds per plant) when tested against pooled deviation indicated that genotypes responded consistently over the environments. Mean square due to genotype x environment interaction (linear) effect was non-significant for all traits (except seeds per plant) indicated that performance of genotypes remained similar for their linear regression on environmental index and significant for seeds per plant indicated that prediction of performance across the environments against these characters would be highly effective. Among locations, Achhalia (E2) was found to be the most favourable for fruit yield and other related traits. Stability analysis for seeds per fruit, revealed that four hybrids viz., AOL-12-52 X Arka Anamika, AOL-12-144 X Parbhani Kranti, AOL-14-32 X Parbhani Kranti and AOL-14-32 X Arka Abhay manifested below average stability, indicated that hybrids specifically adapted to favorable (good) environments while hybrid AOL-12-52 X GJO-3 manifested above average stability, indicated that this hybrid specifically adapted to unfavorable (poor) environments.