Fig. 3.

Comparative analysis of chloroplast genomes of 107 sweetpotatoes and 11 wild species. The contents of the feature rings (starting with the outermost ring) are as follows: Ring 1: COG functional categories for forward strand coding sequences; Ring 2: forward strand sequence features; Ring 3: reverse strand sequence features; Ring 4: COG functional categories for reverse strand coding sequences. The next 118 rings show regions of sequence similarity detected by BLAST comparisons conducted by DNA sequence between the reference genome and the 118 chloroplasts genomes. The two innermost rings show GC skew and GC content respectively