Figure 8.

Distribution of gene blocks. A total of 134 gene blocks were recognized in the 124 orchid plastomes. Thirty were constant blocks. 104 blocks show both forward (dark blue) and reverse (red) orientations and confirmed the block rearrangements. Blocks that are non-applicable because of gene losses or shifts are indicated in gray. All large rearrangements longer than 15 kb are located on the LSC. The species names in red indicate mycoheterotrophic orchids. (A): Forward and reverse orientations of each gene block in the orchid species. (B): Locations, lengths, and frequencies of 134 gene blocks.