Integrated analysis for genotypic adaptation in rice

Development of varieties with high yield potential coupled with wide adaptability is an important plant breeding objective. The presence of genotype by environment (GxE) interaction plays a crucial role in determining the performance of genetic materials, tested at different locations and in different years. This study was undertaken to assess yield performance, stability and adaptability of thirty-six rice genotypes of three different maturity groups evaluated over 12 environments. There were highly significant (P<0.05) genotype-environment interaction in three different maturity groups. The AMMI analysis of variance in the maturity groups also showed significant genotype, location and G´L. Stability in yield performance was predicted using nine stability parameters (b, S2d , CV, SF, R1, R2, W, S1 and ASV). The rank correlation coefficient among nine parameters indicated that the stability parameters were dissimilar in for all the maturity groups. Stability index (STI) computed by integrating all the nine stability parameters indicated that genotypes Lalat and OR 2006-12 of mid-early group, genotypes OR 1912-25, OR 2310-12 and MTU 1001 of mid-late group, and genotypes OR 1898-3-16, OR 1901-14-32, OR 2109-2, OR 2001-1, Mahanadi and Jagabandhu of late group yielded higher consistently over the 3 years in the different agroclimatic zones.Le développement de variétés à potentiel élevé de rendement couplé à une large adaptabilité est un objectif important de l&apos;amélioration des plantes. La présence de génotype par interaction avec l&apos;environnement (GxE) joue un rôle crucial dans la détermination des performances de matériels génétiques testés dans différentes localisations et dans des années différentes. Cette&apos;étude était entreprise pour évaluer la performance en rendement, la stabilité et l&apos;adaptabilité de trente six génotypes de riz de trois groupes de maturité différente évaluées sur 12 environnements. L&apos;interaction génotype-environnement était significativement élevé (P