Characterization of the Complete Chloroplast Genome of Bunge (Sapindales: Aceraceae): A New Woody Oil Tree Species Producing Nervonic Acid.

, which is a new woody oil tree species, is an important ornamental and medicinal plant in China. To assess the genetic diversity and relationships of , we analyzed its complete chloroplast (cp) genome sequence. The cp genome comprises 156,492 bp, with the large single-copy, small single-copy, and inverted repeat (IR) regions consisting of 86,010, 18,050, and 26,216 bp, respectively. The cp genome contains 112 unique functional genes (i.e., 4 rRNA, 30 tRNA, and 78 protein-coding genes) as well as 78 simple sequence repeats, 9 forward repeats, 1 reverse repeat, 5 palindromic repeats, and 7 tandem repeats. We analyzed the expansion/contraction of the IR regions in the cp genomes of six species. A comparison of these cp genomes indicated the noncoding regions were more diverse than the coding regions. A phylogenetic analysis revealed that is closely related to . Moreover, a novel indel marker was developed for distinguishing several species (i.e., , , , , , and ). The results of the current study provide valuable information for future evolutionary studies and the molecular barcoding of species.