Gxe Interaction, Adaptability and Yield Stability of Mid-Early Rice Genotypes

Multilocation yield trials of 11 mid-early (110–125 days) rice genotypes were conducted at Bhubaneswar, Chiplima, Jeypore and Ranital over 3 years 2003–2005, during kharif season. ANOVA of yield data of the 12 environments revealed highly significant differences among genotypes and environments and significant GxE interaction indicated differential performance of genotypes over environments. Considering mean, and the Linear Regression parameters b and S²_d values jointly, 3 of the 6 genotypes giving above average yield showed stability of performance of which Lalat showed adaptability to all environments, while OR 2200-5 and Konark showed specific adaptation to rich environment. Stability assessment on the basis of parameters like CV, SF, R₁, R₂, W and ASV revealed that the genotypes OR 1929-4, Lalat, OR 1739–47 and Bhoi showed stability of yield performance according to 6 or 5 parameters. AMMI (Additive Main and Multiplicative Interaction) analysis showed differential performance of the genotypes in the 4 locations and of the 6 higher yielding genotypes, Lalat, OR 2200-5 and OR 1976–11 had low GxL interaction, while OR 2006–12, OR 2172-7 and Konark had high G&L interaction. AMMI-predicted yield showed that Lalat and OR 2006–12 were high yielder and possessed broad adaptation to most locations. Genotypes showing good adaptation to specific locations were OR 2200-5 for Ranital, OR 2172-7 and OR 1916–19 for Bhubaneswar, OR 1976–11 for Chiplima and Konark for Ranital.