Figure 5.

The phylogenetic relationships (A) and PCGs distribution of three Coptis species and other 4 Ranunculaceae species (B). The Maximum Likelihood tree was constructed based on the sequences of 23 conserved protein-coding genes. Outgroup: Liriodendron tulipifera, Magnolia officinalis and M. biondii. About PCGs distribution, white boxes indicate that the gene is not present in the mt genomes. Light yellow, golden, blue, black and pink boxes indicate that one, two, three, five and six copies exist in the particular mitochondrial genomes, respectively.