Figure 4

Comparative maps of several solanaceous species and the deduced genome arrangement of MRCAs. T1-12, Pt1-12, E1-12, P1-12 and N1-12 represent 12 chromosomes of tomato, potato, eggplant, pepper and Nicotiana genomes respectively. Designation of chromosome segments (a-c) is detailed in Additional File 2. ATPt1-12, ATE1-12 and ATP1-12 represent 12 chromosomes of ATPt, ATE and ATP genomes. White dots indicate the approximate centromere location of the tomato chromosomes. Maps of the other species are depicted in a comparative way to the tomato map as follows. A black arrow indicates an inversion relative to tomato (a grey arrow for an uncertain inversion). A black bar indicates the breakpoint region of a translocation relative to tomato (a grey bar for an uncertain translocation). Two black bars connected by a curve indicate that the segment in between is excised in a translocation while the remained parts stay together, e.g. E10a is embedded in E3b. "1+" (or "2+") on a single arrow indicates that the region has experienced at least one (or two) inversions but the exact number remains to be determined. Position and length of arrows and bars are approximate. See the close-up figure in Additional File 3.