Fig. 1

The diagram illustrates the chloroplast gene maps of C. tibetica (A) and C. turkestanica (B). The genes located on the outer circle are transcribed counterclockwise, whereas those on the inner circle are transcribed clockwise. Different functional gene groups are represented by different color codes. In addition, changes in GC content are represented by light gray in the inner circle, while changes in AT content are represented by dark gray