Genotype-Environment Interaction and Stability for Yield of Inbred and Hybrid Rainfed Lowland Rice (Oryza sativa L.) Varieties in Bangladesh

Forty-eight rice genotypes of inbred and hybrid rice varieties developed or registered by different organizations were evaluated for their stability for grain yield through regression coefficient and deviation from regression analysis. The experiment was laid out in a randomized complete block design with three replications at seven locations of Bangladesh. Highly significant mean sum of squares due to genotype and environment and pooled deviation indicated sufficient variability among the genotypes and environments for yield and revealed the importance of a non-linear component accounting for the total genotype-environment interaction. Khulna (E3) was found as most favorable location because of showing highest environmental mean yield and environmental index. The stability parameters for grain yield revealed wider adaptability of the genotypes V5 (BRRI dhan30), V13 (BRRI dhan49), V29 (Binadhan-17), V33 (Mukti-1), V34 (Agro dhan-12), V35 (Bayer hybrid dhan-4) and V41 (BADC hybrid dhan-6). The genotypes V32 (BRRI hybrid dhan6), V1 (BR10), V40 (BADC hybrid dhan-2), V15 (BRRI dhan52), V7 (BRRI dhan32), V21 (BRRI dhan72), V20 (BRRI dhan71), V30 (Binadhan-7), V6 (BRRI dhan31), V31 (BRRI hybrid dhan4), V26 (Binadhan-11), V19 (BRRI dhan66), V48 (Bindhan-4), V24 (BU dhan-1), V22 (BRRI dhan73), V38 (Hera-16), V44 (BRRI dhan44), V36 (Bayer hybrid dhan-6), V2 (BR22), V46 (BR11) and V43 (BRRI dhan75) showed insignificant regression coefficient (bi) values and higher mean yield than the grand mean and positive phenotypic index (Pi) indicating them to be suitable for poor environment.Bottom of For