Fig. 1

Chloroplast genome map of G. lancangensis (GenBank accession number: MT473704; the outermost three rings) and CGView comparison [31] of eighteen Zingiberoideae chloroplast genomes (the inter rings with different colors). Genes belonging to different functional groups are shown in different colors in the outermost first ring. Genes shown on the outside of the outermost first ring are transcribed counter-clockwise and on the inside clockwise.The gray arrowheads indicate the direction of the genes. The tRNA genes are indicated by one letter code of amino acids with anticodons. LSC, large single copy region; IR, inverted repeat; SSC, small single copy region. The outermost second ring with darker gray corresponds to GC content, whereas the outermost third ring with the lighter gray corresponds to AT content of G. lancangensis chloroplast genome by OGDRAW [30]. The innermost first black ring indicates the chloroplast genome size of G. lancangensis. The innermost second and third rings indicate GC content and GC skews deviations in chloroplast genome of G. lancangensis, respectively: GC skew + indicates G > C, and GC skew – indicates G < C. From innermost fourth color ring to outwards 21st ring in turn: G. lancangensis MT473704, G. marantina MT473705, G. multiflora MT473706, G. schomburgkii MK262735, G. schomburgkii var. angustata MT473707, H. coccineum MT473708, H. coronarium MK262736, H. neocarneum MT473709, H. spicatum NC_047248, K. galanga MK209001, K. elegans MK209002, K. rotunda ‘Red Leaf’ MT473710, K. rotunda ‘Silver Diamonds’ MT473711, Z. montanum MK262727, Z. officinale NC_044775, Z. recurvatum MT473712, Z. spectabile JX088661 and Z. zerumbet MK262726; chloroplast genome similar and highly divergent locations are represented by continuous and interrupted track lines, respectively. The sequenced species studied here were marked in bold