Fig. 5

Pairwise comparisons of the plastid genomes. We use gray and red ribbons to represent highly homologous regions, where the gray ribbon represents the same direction and the red ribbon represents the opposite direction, that is, the inverted region of the genome. (a) Pairwise comparison of the five different plastid genome types. (b) A 60 kb inversion was observed in Opuntia microdasys and Ariocarpus retusus by comparison with related species. We marked the absence of ycf2 in Opuntia microdasys