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Uncovering dynamic evolution in the plastid genome of seven Ligusticum species provides insights into species discrimination and phylogenetic implications

文献类型： 外文期刊

作者： Yuan, Can 1 ; Sha, Xiufen 1 ; Xiong, Miao 1 ; Zhong, Wenjuan 1 ; Wei, Yu 2 ; Li, Mingqian 3 ; Tao, Shan 1 ; Mou, Fangshen 1 ;

作者机构： 1.Sichuan Acad Agr Sci, Ind Crop Res Inst, Chengdu 610300, Peoples R China

2.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Crop Resources & Genet Improvement, Beijing 100081, Peoples R China

3.Zhejiang Acad Tradit Chinese Med, Tongde Hosp Zhejiang Prov, Canc Inst Integrated Tradit Chinese & Western Med, Hangzhou 310012, Zhejiang, Peoples R China

4.Chinese Mat Med China Agr Res Syst, Comprehens Expt Stn Cheng Du, Chengdu 610300, Sichuan, Peoples R China

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2021 年 11 卷 1 期

页码：

收录情况： SCI

摘要： Ligusticum L., one of the largest members in Apiaceae, encompasses medicinally important plants, the taxonomic statuses of which have been proved to be difficult to resolve. In the current study, the complete chloroplast genomes of seven crucial plants of the best-known herbs in Ligusticum were presented. The seven genomes ranged from 148,275 to 148,564 bp in length with a highly conserved gene content, gene order and genomic arrangement. A shared dramatic decrease in genome size resulted from a lineage-specific inverted repeat (IR) contraction, which could potentially be a promising diagnostic character for taxonomic investigation of Ligusticum, was discovered, without affecting the synonymous rate. Although a higher variability was uncovered in hotspot divergence regions that were unevenly distributed across the chloroplast genome, a concatenated strategy for rapid species identification was proposed because separate fragments inadequately provided variation for fine resolution. Phylogenetic inference using plastid genome-scale data produced a concordant topology receiving a robust support value, which revealed that L. chuanxiong had a closer relationship with L. jeholense than L. sinense, and L. sinense cv. Fuxiong had a closer relationship to L. sinense than L. chuanxiong, for the first time. Our results not only furnish concrete evidence for clarifying Ligusticum taxonomy but also provide a solid foundation for further pharmaphylogenetic investigation.

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