G × E interaction of late duration rice genotypes in different models and evaluation of adaptability and yield stability

Yield trials on 12 late duration (145-165 days) rice genotypes were conducted at Bhubaneswar, Chiplima, Jeypore and Ranital over 3 years 2003-2005, during kharif season. ANOVA of grain yield data of the 12 environments revealed highly significant differences among genotypes and environments and significant G×E interaction indicated differential performance of genotypes over environments. Considering mean and the Linear Regression parameters b and S2d values jointly, four of the seven genotypes giving above average yield showed stability of performance of which OR 1898-3-16 and Mahanadi showed adaptability to all environments, where as OR 1901-14-32 and Jagabandhu showed specific adaptation to poor environments. Stability assessment on the basis of parameters like CV, SF, R1, R2, W and ASV revealed that the genotypes the genotypes OR 1898-2-15, Mahanadi, Jagabandhu and OR 1901-14-32 showed stability according to 6 or 5 of the six parameters. AMMI (Additive Main and Multiplicative Interaction) analysis showed differential performance of the genotypes in the 4 locations and three of the four top yielding genotypes viz., OR 1898-3-16, OR 2109-2 and Jagabandhu had small G×L interaction, indicating their stable performance over locations. OR 1901-14-32, the highest yielder, showed high positive interaction at Jeypore and high negative interaction at Chiplima. AMMI-II predicted yield showed that OR 1898-3-16 possessed broad adaptation to all locations. Jagabandhu and Mahanadi are better suited both for Bhubaneswar and Chiplima and OR 1901-14-32 is better suited both for Jeypore and Ranital. The genotypes OR 2119-13 and OR 2109-2 are best suited for Jeypore and Ranital locations, respectively.