The complete chloroplast genome sequence of gynostemma Yixingense and comparative analysis with congeneric species

Abstract

Gynostemma yixingense, an important medicinal member of the Cucurbitaceae family, is an endemic herbaceous species distributed in East China. It is morphologically similar to the plants in the same genus, which resulted in some con-fusion in identification and application. Meanwhile, there are still some controversies in taxonomy. Herein, the complete chloroplast genome sequence of G. yixingense was obtained by Illumina paired-end sequencing technology and com-pared to other chloroplast genome sequences of congeneric species. The complete chloroplast genome of G. yixingense is 157,910 bp in length with 36.94% GC content and contains a large single-copy (LSC) region of 86,791 bp, a small single-copy (SSC) region of 18,635 bp and a pair of inverted repeat (IR) regions of 26,242 bp. The whole genome contains 133 unique genes, including 87 protein-coding genes, 37 tRNA genes, eight rRNA genes and one pseudogene. In addition, 74 simple sequence repeats (SSRs) were identified, most of which were A/T rich. The phylogenetic analysis indicated that G. yixingense had the closest relationship to G. laxiflorum. The result of this study pro-vided an important theoretical basis for chloroplast genome and phylogenetic analysis of G. yixingense.