The complete chloroplast genome of Cymbidium longibracteatum (Orchidaceae) and phylogenetic analysis

Cymbidium longibracteatum is a common cultivated species in the genus Cymbidium due to its elegant appearance, rich flower colors and strong fragrance, but its classification is quite controversial. In this study, the complete chloroplast genome of C. longibracteatum was obtained by Illumina sequencing. The chloroplast genome of C. longibracteatum is 150,070 bp in length with an overall GC content of 37.12%, which contains a large single-copy (LSC;84,949 bp) region, a small single-copy (SSC;13,745bp) region, and a pair of inverted repeats (IRs; 25,688 bp) regions. The genome contains 130 genes, namely 84 protein-coding genes, 38 tRNA genes and 8 rRNA genes. The maximum-likelihood phylogenetic tree has proved that C. longibracteatum should exist as an independent species in the genus Cymbidium, and it is most closely related to C. tortisepalum. This study provides valuable sequence resources for further study of C. longibracteatum.