This study evaluated 31 elite winter wheat genotypes across 13 Canadian environments from 2019 to 2022. Because environments and genotype sets differed across years, the dataset was analyzed as two trial-year sets (2019/2020 and 2021/2022). Grain yield and stability were assessed using genotype main effect plus genotype by environment interaction (GGE). Results revealed different performance for genotypes across western and eastern locations. University of Guelph genotypes performed well in eastern Canada, whereas western genotypes showed lower yield and stability in eastern environments. Regional adaptation strongly influenced performance, with genotypes performing most consistently in their target environments, supporting region-specific breeding strategies.
Kaviani et al. (2026) studied this question.