Fig. 2

Analysis of the Contraction and Expansion of the IR regions. Schematic representation of the boundary areas of LSC (light blue), IRa (yellow), SSC (green), and IRb (yellow) regions for Zingiber spectabile, A. galanga, A. hainanensis, A. nigra, A. officinarum, and three A. oxyphylla accessions. The species names are shown to the left. The long horizontal blocks represent the plastomes. The name and length of each region are shown. The junction sites between LSC, IRa, SSC, and IRb are marked with the perpendicular dashed line. The genes rpl22 (dark blue), rps19 (light red), ycf1 (blue), ndhF (red), and psbA (light purple) are shown above the plastomes. The numbers above the gene features denote the distance between the gene borders, either the start or end of genes and the junction sites