Fig. 3

Circular map of cross-genus consensus chloroplast genome sequences of three Primulina species and Boea hygrometrica. The outermost circle is positions (in Kb) of consensus cp genome sequences. a Annotation of consensus cp genome sequences. Genes shown inside and outside of the circle are transcribed clockwise and counterclockwise, respectively, and their gene names are marked as black and red, respectively. Genes belonging to different groups are marked with different color, with the bar shown in the center. b Distribution of conserved regions of the four cp genomes. The grey columns represent the Con_Islands, which were defined as the regions containing over 50 continuous conserved sites in cross-genus consensus cp genome sequences. c Distribution of intrageneric and intergeneric polymorphism. The red and blue lines represent average intrageneric and intergeneric PICs in a 100 bp windows with a step of 25 bp, respectively. The PICs were counted by the sum of SNP and Indel between two cp genomes. d Distribution of restriction enzyme site of EcoRI. The outer to inner circles represent the distribution of EcoR I in P. eburnea, P. huaijiensis, P. linearifolia and B. hygrometrica in turns