Genotype X environemnt interactions and adaptability with sustaiabilty index their comparision in aromatic rice (Oryza sativa L.) under transplanted condition

Seven release varieties of aromatic rice (Oryza Sativa L.) were evaluated for stability of grain yield in complete randomized block design during kharif 2006–2010, at Agricultural Research station, Ummedganj Farm, Kota (Raj) under transplanted condition of South-Eastern plane Zone of Rajasthan. The genotypes yield, regression co efficient (bi), deviation from regression (S²d) with sustainability index was used to identify the stability and adaptability of genotypes. Pooled analysis of variance showed highly significant differences among environments (year), genotypes and GXE interaction. Sufficient mean squares due to genotype x environment (G x E) interactions indicated that the genotypes interacted considerably with the environmental condition. Both linear and nonlinear components of G x E interactions were significant showing the importance of both components in the expression of the traits. The linear component was significant as against the nonlinear component (Pooled deviation), which revealed that a large portion of G x E interaction was accounted for by the linear regression through pooled deviation was significant. Based on estimated stability parameters and over all mean performance of grain yield, variety P-1121, P-2511 P-1460 and Pusa Basmati-1 were identified as superior,which were well adapted to all the environment, stable with above average yielding ability or highest grain yield (45.75, 45.23,43.38 and 41.08 q/ha⁻¹, respectively) with non-significant bi and s²d values coupled with high sustainability index. This showed that these varieties were better responsive to the favorable environments. Mahi sugandha and Taraori (Checks) was good for low yielding environments (response to poor environment) and contradict with respect to the stability parameters and the sustainability index.