Fig. 1

Chloroplast genome map of C. barbatus (GenBank accession number: OP712648; the outermost three rings) and CGView comparison of thirteen complete chloroplast genomes in the Costaceae family (the inter rings with different colors). Genes shown on the outside of the outermost first ring are transcribed counter-clockwise and on the inside clockwise. Outermost second ring with darker gray corresponds to GC content, whereas outermost third ring with the lighter gray corresponds to AT content of C. barbatus chloroplast genome by OGDRAW. The gray arrowheads indicate the direction of the genes. LSC, large single copy region; IR, inverted repeat; SSC, small single copy region. The innermost first black ring indicates the chloroplast genome size of C. barbatus. The innermost second and third rings indicate GC content and GC skews deviations in chloroplast genome of C. barbatus, respectively: GC skew + indicates G > C, and GC skew − indicates G < C. CGView comparison result of thirteen complete chloroplast genomes in Costaceae displayed from innermost fourth color ring to outwards 16th ring in turn: C. barbatus OP712648, C. beckii OP712653, C. dubius OP712651, C. speciosus Guangdong OP712649, C. speciosus var. marginatus OP712652, C. tonkinensis Yunnan OP712650, C. viridis MK262733, C. woodsonii OP712654, H. speciosa Guizhou OK641589, M. uniflorus OP712655, H. lacera ON598391, H. speciosa Yunnan ON598392, and C. tonkinensis ON598393; chloroplast genome similar and highly divergent locations are represented by continuous and interrupted track lines, respectively. The species in bold are sequenced in this study