Figure 1

Multiple losses of matK editing sites in angiosperms. A) Nucleotides found at the matK-2 editing site were mapped on a phylogenetic tree encompassing all major angiosperm groups (Soltis et al. 2000). Of the 298 genera investigated, only those that represent independent C-to-T mutations at the editing site are shown (criteria for an independent C-to-T loss are presented in Additional file 3). Additional C-to-T mutations for which independence could not be ascertained are not shown. Branches of the tree without independent C-to-T losses are reduced. The full tree is shown in Additional file 1. Light gray = genera in which all species have a T at the editing site; dark gray = genera containing T-species and C-species. B) Same analysis for matK-3; full data is shown in Additional file 2.