Fig. 1

Population structure and neighbor-joining (NJ) tree of 215 cultivars based on 3792 unlinked SNP markers. (a) plot of ΔK against putative K ranging from 1 to 12; (b) stacked bar plot of ancestry relationships of 215 wheat cultivars; (c) NJ tree based on Nei’s distance. The two divergent groups are shown in black (162) and red (53), respectively