Figure 7

Nucleotide frequencies across streptophytes for whole genomes of chloroplasts (a) and mitochondria (b), and combined codon positions for the conserved proteomes of chloroplasts (c) (57 genes) and mitochondria (d) (13 genes). Nucleotides are represented by filled circles for T, open circles for A, open triangles for G, and filled triangles for C. The convergence of nucleotide composition can be observed across whole genomes and conserved proteomes. Taxa with available RNA editing data are duplicated and designated as "edit-repaired" by an asterisk. Taxa are arranged according to a phylogenetic sequence of [46] and divergence times are not considered. Broad taxonomic groupings are indicated on the X-axis below brackets. Taxonomic abbreviations are described in Additional file 3.