College of Marine Science and Biological Engineering, Qingdao University of Science and Technology, Qingdao, China.
Yunnan Institute of Tropical Crops, Xishuangbanna, China.
PeerJ. 2023 Feb 3;11:e14573. doi: 10.7717/peerj.14573. eCollection 2023.
The genus (Lauraceae) includes about 90 evergreen tree species that are an ideal source of timber. Habitat destruction and deforestation have resulted in most of them being endemic to China. The accurate identification of endangered species in China is necessary for their conservation. Chloroplast genome sequences can play an important role in species identification. In this study, comparative chloroplast genome analyses were conducted on diverse species that are primarily distributed in China. Despite the conserved nature of chloroplast genomes, we detected some highly divergent intergenic regions (, , and -GUC) as well as three highly divergent genes (, , and ) that have potential applications in phylogenetics and evolutionary analysis. The phylogenetic analysis indicated that various species in China were divided into three clades. The complete chloroplast genome was better suited for phylogenetic analysis of species. In addition, based on the phylogeographical analysis of species in China, we inferred that the species in China first originated in Yunnan and then spread to other southern areas of the Yangtze River. The results of this research will add to existing case studies on the phylogenetic analysis of species and have the potential to contribute to the conservation of species that are in danger of extinction.
（樟科）属约有 90 种常绿乔木树种，是理想的木材来源。生境破坏和森林砍伐导致它们中的大多数成为中国特有的物种。准确识别中国濒危物种对它们的保护至关重要。叶绿体基因组序列在物种鉴定中可以发挥重要作用。在这项研究中，对主要分布在中国的不同物种进行了比较叶绿体基因组分析。尽管叶绿体基因组具有保守性，但我们检测到一些高度分化的基因间区（、、和-GUC）以及三个高度分化的基因（、、和），它们在系统发育和进化分析中具有潜在的应用价值。系统发育分析表明，中国的各种物种分为三个分支。完整的叶绿体基因组更适合于物种的系统发育分析。此外，基于中国物种的系统地理学分析，我们推断中国的物种最初起源于云南，然后传播到长江以南的其他地区。本研究的结果将增加樟科物种系统发育分析的现有案例研究，并有可能为保护濒危物种做出贡献。
