Figure 1.

Basic characteristics of the 24 Nicotiana chloroplast genomes. (A) Circos plot showing basic characteristics of the chloroplast genomes acquired in this study. The gene position, quadripartite structure, GC content, density of variant sites, and nucleotide diversity (Pi) were shown from the outer to inner rings. The outermost rectangles were chloroplast genes belonging to different functional groups that were color-coded. Gene blocks shown on the outside and inside the circle were transcribed clockwise and counterclockwise, respectively. (B) The GC content of CDS, intron, tRNA, and rRNA genes among Nicotiana chloroplast genomes. (C) The number of RNA editing sites among genes of chloroplast genomes. (D) The number of amino acid conversions resulting from RNA editing in chloroplast genomes.