Complete chloroplast genome of Impatiens huangyanensis Jin and Ding 2002: genomic features and phylogenetic relationship within genus Impatiens (Balsaminaceae)

Impatiens huangyanensis Jin and Ding 2002 is a plant species with very small populations, and it distributes only in Huangyan, Zhejiang Province, China. In this study, the complete chloroplast genome of I. huangyanensis was assembled by using high-throughput Illumina paired-end sequences. Its genomic feature was determined, and comparative genomic analysis of the genus Impatiens was performed. The results revealed that the full-length chloroplast genome of I. huangyanensis was 152,156 bp with a GC content of 36.8%. The chloroplast genome contains a typical quadripartite structure, comprising two copies of inverted repeats (IRs), a small single-copy (SSC) region, and a large single-copy (LSC) region. The sequence lengths of IR, SSC, and LSC were 25,756 bp, 17,662 bp, and 82,982 bp, respectively. The chloroplast genome consisted of 134 genes, including 84 protein-coding genes, 37 transfer RNA genes, eight ribosomal RNA genes, and five pseudogenes. Phylogenic results indicated I. huangyanensis shared a clade with I. davidii Franchet 1883, I. macrovexilla Chen 2000, I. fanjingshanica Chen 1999, and I. piufanensis Hook 1908, with a support rate of 100%. Our study provided insight into further studies on the conservation genetics of I. huangyanensis.