Abstract
Cinnamomum camphora, a member of the Lauraceae family, is a valuable aromatic and timber tree that is indigenous to the south of China and Japan. All parts of Cinnamomum camphora have secretory cells containing different volatile chemical compounds that are utilized as herbal medicines and essential oils. Here, we reported the complete sequencing of the chloroplast genome of Cinnamomum camphora using illumina technology. The chloroplast genome of Cinnamomum camphora is 152,570 bp in length and characterized by a relatively conserved quadripartite structure containing a large single copy region of 93,705 bp, a small single copy region of 19,093 bp and two inverted repeat (IR) regions of 19,886 bp. Overall, the genome contained 123 coding regions, of which 15 were repeated in the IR regions. An analysis of chloroplast sequence divergence revealed that the small single copy region was highly variable among the different genera in the Lauraceae family. A total of 40 repeat structures and 83 simple sequence repeats were detected in both the coding and non-coding regions. A phylogenetic analysis indicated that Calycanthus is most closely related to Lauraceae, both being members of Laurales, which forms a sister group to Magnoliids. The complete sequence of the chloroplast of Cinnamomum camphora will aid in in-depth taxonomical studies of the Lauraceae family in the future. The genetic sequence information will also have valuable applications for chloroplast genetic engineering.
Highlights
Cinnamomum, contains 250–300, or more, species worldwide and is a species-rich genus of evergreen aromatic tree and shrub belonging to the Lauraceae family
We presented results of a phylogenetic analysis of protein sequences from Cinnamomum camphora and 25 other plant species
The chloroplast genome had a single circular chromosome with a quadripartite structure, which included a pair of inverted repeat (IR) regions (19,886 bp) that were separated by a large single copy (LSC, 93,705 bp) and a small single copy (SSC, 19,093 bp) regions (Fig. 1)
Summary
Cinnamomum, contains 250–300, or more, species worldwide and is a species-rich genus of evergreen aromatic tree and shrub belonging to the Lauraceae family. As the representative species of Cinanamomum, the camphor tree (Cinnamomum camphora) is a broad-leaved evergreen characterized by aromatic oils in all of the plant parts. This species originated in the southern parts of China and Japan, and has a widespread naturalized distribution in many other countries. They have oval or elliptical leaves with wavy margins that give off a distinctive aromatic smell when crushed. In addition to providing sources for spices and essential oils, the species has a notable commodity value as lumber and is ecologically significant in garden construction (Babu et al, 2003)
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