Abstract
Crop cultivar performance is a result of combined effects of genotype, environment and genotype × environment (G × E) interaction. To effectively generate reliable estimates of crop yield the magnitude and patterns of G × E in regional yield trials should be specified. This research aimed to (1) investigate existing possible mega-environments (ME) and suitability of test locations for winter wheat zoning, and (2) determine the role of climatic factors in clustering patterns of G × E. Winter wheat yield data from a three-year nationwide yield trial consisting of 24 genotypes grown in 24 test environments supplemented with 37 climatic factors were subjected to empirical and analytical analyses. Standard deviation-scaled genotype main effect and G × E interaction (SD-GGE) biplot methodology, factorial regression and partial least square regression were applied to both analyses. The combined ANOVA showed that the environmental effect was the main source of variation (83%), and the magnitude of G × E interaction was sixfold greater than genotype alone. The SD-GGE biplot confirmed non-repeatable patterns for grouping of test locations across years, indicating significant (P < 0.01) rank-change location-by-year interactions and existence of strong "crossover" G × E interactions. This led to the conclusion that the winter wheat growing region in Iran consists of a single but complex ME for grain yield, suggesting that high-yielding-and stable winter wheat genotypes should be developed for the entire region rather than genotypes adapted to specific agro-ecological regions. Precipitation (monthly and total) and temperature (minimum, maximum and average) accounted for 25.4% and 56.8% of total G × E.
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Acknowledgements
This research (Grant Code: 0-15-15-005-950406) was funded by Dryland Agriculture Research Institute (DARI) of Iran. Special thanks to Dr. E. Mohammadi for making the GIS analysis. The authors thank all research assistants who directly or indirectly collaborated in carrying out this study. The authors also thank the reviewers and Associate Editor of Euphytica for comments and corrections to the manuscript.
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Roostaei, M., Jafarzadeh, J., Roohi, E. et al. Grouping patterns of rainfed winter wheat test locations and the role of climatic variables. Euphytica 217, 183 (2021). https://doi.org/10.1007/s10681-021-02915-8
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DOI: https://doi.org/10.1007/s10681-021-02915-8