Fig. 1.

(A) Phenotypic diversity within wild species, cultivated landraces, and cultivars through domestication, improvement, and modern breeding efforts. Exemplar species, landraces, and elite North American cultivars are shown that highlight tuber size, shape, and pigmentation diversity. (B) Phylogeny and population structure of the samples in the domestication panel. The phylogenetic tree is based Nei’s genetic distances calculated from 687,172 fourfold-degenerate sites from conserved potato genes. Population structure is based on 50,000 genome-wide SNPs. The optimal number of subpopulations (K = 5) included wild outgroups (purple), wild Solanum relatives (green), a wild subgroup diverging from the cultivated lineage after most other species (gold), Andean landraces (teal), and S. tuberosum group Tuberosum (navy).