Phylogenetic tree and population structure of 25 re-sequenced soybean accessions. a, Neighbor-joining tree of soybean accessions. Northeast region. South region. Middle part of Huanghuai region. North part of Huanghuai region. South part of Huanghuai region. W82, Williams 82. b, Population structure inferred by ADMIXTURE. Each accession shown as a vertical line partitioned into K colored components represents inferred membership in K genetic clusters. Blue, wild lines; red, landrace lines; green, elite cultivars.