Fig. 1.

Germplasm origin and genetic relationships among worldwide sorghum accessions. (A) Geographic origin for 469 of 971 worldwide accessions, for which source location is known, color-coded by morphological type. (B) Genetic relatedness among the same 469 accessions assessed by neighboring joining method, with the predominant region of origin for each cluster noted, or in one case, the cluster containing guinea margaritiferum types. Worldwide sorghum populations show structuring by morphological type within regions.