Characterization and phylogenetic analysis of the complete chloroplast genome sequence of Dendrobium hainanense (Orchidaceae)

In this study, we report the chloroplast (cp) genome of Dendrobium hainanense. The cp genome was 151,367 bp in length; the overall CG content of the genome was 37.46%. The length of the large single-copy (LSC) region was 83,938 bp, and 15,829 bp in a small single-copy (SSC) region, and a pair of inverted repeats (IRs) of 12,900 bp. One hundred and twenty-seven genes were predicted, including 81 protein-coding genes, 38 genes for tRNA, and eight genes for rRNA. The results of phylogenetic tree showed that Dendrobium hainanense had the closest genetic relationship with Dendrobium parciflorum. This study will be help to understand the genetic diversity of Dendrobium.本研究报道了海南石斛（Dendrobium hainanense）的叶绿体（chloroplast, cp）基因组。该叶绿体基因组全长151367 bp，整体CG含量为37.46%。其中大单拷贝（large single-copy, LSC）区长度为83938 bp，小单拷贝（small single-copy, SSC）区长度为15829 bp，另有一对各长12900 bp的反向重复（inverted repeats, IRs）区。本研究共预测得到127个基因，包括81个蛋白编码基因、38个转运RNA（tRNA）基因以及8个核糖体RNA（rRNA）基因。系统发育树（phylogenetic tree）分析结果显示，海南石斛与少花石斛（Dendrobium parciflorum）的亲缘关系最为密切。本研究有助于深入理解石斛属植物的遗传多样性。