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Distribution of the TaSDIR1-4A haplotypes Hap-4A-1 and Hap-4A-2 in 10 wheat-producing regions across China. (A) Proportions of the two haplotypes in 157 Chinese landraces and (B) in 348 modern cultivars. Winter wheat regions: I, Northern; II, Yellow and Huai River valleys; III, Low and middle Yangtze River valley; IV, Southwestern; V, Southern. Spring wheat regions: VI, Northeastern; VII, Northern; VIII, Northwestern. Spring–winter wheat regions: IX, Qinghai–Tibet; X, Xinjiang.
