Broad-scale population structure of A. thaliana. (A) The inferred population structure tree (PST). Each element in the hierarchy represents a cluster of individuals, and each cluster contains those clusters below it in the hierarchy. The root element represents the entire sample of 1214 individuals. In colored dashed lines, the main regions corresponding to sampling locations are indicated (with the labels defined post hoc). (B) Visualization of the branch corresponding to most European sampling locations. Each cluster is assigned a color such that “closer” colors represent closer clusters in the PST. On the map, each individual is placed at its sampling location and colored according to the finest-scale cluster to which it was assigned. (C) Visualization of the branch corresponding to Africa, Asia, North Sweden, and some samples in the Iberian Peninsula.
