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Thirty basmati and non-basmati rice genotypes were evaluated in five different locations representing varied agroclimatic zones in Himachal Pradesh during kharif 2017 and 2018 for stability of grain yield. Additive main effect and multiplicative interaction and stability model were employed to study the GxE interaction. ANOVA revealed significant differences among genotypes and locations along with significant G × E interaction. Both linear and non-linear components contributed towards G × E interaction. The mean grain yield per plant varied from 11.32-19.49 g among the genotypes with the general mean of 15.83g. Genotype HPR 2693 was identified to have higher mean grain yield per plant than general mean and was stable across the locations. AMMI analysis revealed that the first two significant IPCA scores together explained 77.18% of the total interaction variance. Biplot graphical analysis showed Dhaulakuan to be the less interacting and stable location. Genotype HPR 2693 scored zero for both IPCA1, IPCA2 and also lowest ASV score along with higher average grain yield per plant and therefore could be considered as stable across locations. Pusa-1121, one of the highly prized basmati was also found stable but the average yield per plant over all the location was low and hence could be identified for specific location. Genotypes HPR 2863, HPR 2612, HPR 2667, PB-1509, HPR 2858 showed specific adaptation to Malan while HPR 2761, HPR 2749, HPR 2746, HPR 2720, HPR 2862 and HPR 2880 exhibited specific adaptation at Palampur. These genotypes could be utilized for direct cultivation as well as for improvements of other cultivars. |
