Characterization of the complete chloroplast genome of Pterygocalyx volubilis (Gentianaceae).

Pterygocalyx volubilis Maxim. (Gentianaceae) is a traditional Chinese medicine, and its whole grass is used in the treatment of pulmonary tuberculosis and other conditions. Here, the complete chloroplast genome sequence of P. volubilis was reported based on the Illumina HiSeq Platform. The chloroplast genome genome is 154,365 bp in length, containing a pair of inverted repeated (IR) regions (25,928 bp) that are separated by a large single copy (LSC) region of 84,033 bp, and a small single copy (SSC) region of 18,476 bp. Moreover, a total of 130 functional genes were annotated, including 85 protein-coding genes, 37 tRNA genes, and eight rRNA genes. In the maximum-likelihood (ML) phylogenetic tree, Pterygocalyx clustered with the genus Swertia. This sequenced chloroplast genome of P. volubilis supports that Pterygocalyx belongs to subtribe Swertiinae.