Phylogenetic tree of Arabidopsis accessions and the geographical relations of the accessions. (A) The Arabidopsis phylogenetic tree constructed with SNP data from 19 genomes by SNPhylo. Three major clusters in the tree are circled in three colors, red, blue, and orange. The bootstrap values determined with 1,000 samples are represented in red. (B) Europe continent map showing geographical relations of the accessions in each cluster in the Arabidopsis tree. The origins of accessions circled in red, blue, and orange are located in the geographical west, middle, and east of the continent, respectively.