Complete chloroplast genome of (Papilionoideae): molecular structures, comparative genome analysis and phylogenetic analysis.

belongs to the genus of the family Papilionoideae. It is mainly distributed in the desert and semidesert areas of northern China, and has high medicinal value and ecological function. Previous studies have reported the chemical composition and ecological functions of . However, only a few reports are available on the genomic information of , especially the chloroplast genome, which greatly limits the study of the evolutionary relationship between other species of Papilionoideae. Here, we report the complete chloroplast genome of . The size of the chloroplast genome is 155,207 bp, and the GC content is 36.44%. The chloroplast genome consists of 132 genes, including 83 protein-coding genes, 41 transfer RNA (tRNA) genes,and eight ribosomal RNA (rRNA) genes. Phylogenetic analysis revealed the taxonomic position of in Papilionoideae, and the genus and the genus were highly related. Comparative genomics analysis revealed the gene rearrangement in the evolution of . The comparison between and the species of the Papilionoideae identified a novel 23 kb inversion between the and which occurred before the divergence of and of Thermopsideae. This study provided an essential data for the understanding of phylogenetic status of .