Characterization of the complete chloroplast genome of the medicinal shrub Caragana brevifolia Kom. (Fabales: Fabaceae)

<em>Caragana brevifolia</em> Kom. is a species of shrub with high medicinal value, and is mainly distributed in China, India and Pakistan. In this study, the chloroplast genome of <em>C. brevifolia</em> was determined to be 132,359 bp long with an asymmetric nucleotide composition (32.7%A, 16.7%C, 18.0%G and 32.6%T). It encodes a panel of 110 genes (incl. 76 protein-coding, 30 tRNA and four rRNA genes) with one of them being duplicated and 17 of them containing intron(s). Phylogenetic analysis suggested that <em>C. brevifolia</em> was most closely related to the congeners <em>Caragana rosea </em>Turcz. ex Maxim. and <em>Caragana stenophylla</em> Pojark.细叶锦鸡儿（*Caragana brevifolia* Kom.）是一种兼具较高药用价值的灌木物种，主要分布于中国、印度与巴基斯坦。本研究测定了该物种的叶绿体基因组（chloroplast genome）序列，其全长为132359 bp，核苷酸组成呈现不对称性：腺嘌呤（A）占32.7%、胞嘧啶（C）占16.7%、鸟嘌呤（G）占18.0%、胸腺嘧啶（T）占32.6%。该基因组共编码110个功能基因，其中包含76个蛋白质编码基因、30个转运RNA（transfer RNA，tRNA）基因以及4个核糖体RNA（ribosomal RNA，rRNA）基因；有1个基因发生了序列重复，另有17个基因含有内含子（intron）。系统发育分析（phylogenetic analysis）结果表明，细叶锦鸡儿与同属的红花锦鸡儿（*Caragana rosea* Turcz. ex Maxim.）和狭叶锦鸡儿（*Caragana stenophylla* Pojark.）亲缘关系最近。