Received: Nov 23, 2024 / Accepted: Mar 10, 2026 / Published: Mar 31, 2026
The present research was carried out to study genetic variability in 5×5 half diallel F2 populations of boro rice. The F2 populations of 10 bi-parental crosses, viz. P1 × P2, P1 × P3, P1 × P4, P1 × P5, P2 × P3, P2 × P4, P2 × P5, P3 × P4, P3 × P5, and P4 × P5, were evaluated, along with their parents, for grain yield and related characters. Significant variance revealed a wide range of genetic variability among the segregating progenies and parental genotypes for all the studied traits except grain breadth. The genotypic coefficient of variation (GCV) was smaller than the phenotypic coefficient of variation (PCV) for all the traits except the grain length-breadth ratio. Grain length exhibited high heritability (96.021%) and high genetic advance (22.137%), followed by the grain length-to-breadth ratio (95.308% and 40.7%), and 1000-grain weight (71.96% and 25.32%), respectively. Broader genetic variability for the genotypes was revealed based on boxplot analyses. The F2 family P3×P4 showed the maximum transgressive segregation for the number filled grains per panicle and 1000-grain weight followed by P3×P5.
