Neighbour-joining tree of the accessions. The NJ tree was based on Manhattan distances using 3324 polymorphic markers. Per sample the species name is followed by the accession code (S. che. for Solanum cheesmaniae; S. gal. for S. galapagense; S. pim. for S. pimpinellifolium; S. lyc. for S. lycopersicum; S. per. for S. peruvianum; S. hab. for S. habrochaites and S. pen. for S. pennellii). Bootstrap values (higher than 50) are shown on the branches.