Figure 3 : Population structure of watermelon accessions.

From: The draft genome of watermelon (Citrullus lanatus) and resequencing of 20 diverse accessions

Figure 3

(a) Neighbor-joining phylogenetic tree of watermelon accessions on the basis of SNPs. (b) PCA analysis of watermelon accessions using SNPs as markers. C. lanatus subsp. vulgaris east Asia and America ecotypes and C. lanatus subsp. mucosospermus accessions cluster together (arrow) and are almost indistinguishable. (c) Population structure of watermelon accessions. Each color represents one population, each accession is represented by a vertical bar, and the length of each colored segment in each vertical bar represents the proportion contributed by ancestral populations. Shown are representative watermelon pictures from each subspecies or ecotype.