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 confusion 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 compared 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 provided an important theoretical basis for chloroplast genome and phylogenetic analysis of G. yixingense.
Highlights
Gynostemma yixingense, a member of the Gynostemma genus belonging to the family Cucurbitaceae, is an endemic species in East China
The original G. yixingense and G. yixingense var. trichocarpum were combined to G. yixingense in Flora of China (FOC)
Jeffrey believed that G. laxiflorum and G. yixingense should be the same species in FOC
Summary
Gynostemma yixingense, a member of the Gynostemma genus belonging to the family Cucurbitaceae, is an endemic species in East China. The genus Gynostemma has 14 species (nine endemic) in China (Chen et al, 2011; Zhang et al, 2017). The chloroplast genome is often more conserved, which is great significance in plant phylogeny and species identification (Zhou et al, 2017; Meng et al, 2018). Within Gynostemma, the complete chloroplast genomes of several plant species have been published (Zhang et al, 2017, 2018; Shi et al, 2019), no chloroplast genome of G. yixingense has been reported until now.
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