highly significantp < 0.01
The RIL and IF 2 populations thus seem suitable for dissection of genetic effects involved in yield-related traits and heterosis for these traits. In the combined analyses of variance of the RIL and IF 2 populations across all environments, the sources of variation for genotype, environment, and genotype × environment interaction were highly significant ( p < 0.01) for most yield-related traits (Table 1 ).