Molecular phylogenetics of the Ophiocordyceps sinensis-species complex lineage (Ascomycota, Hypocreales), with the discovery of new species and predictions of species distribution.

IF 5.2 1区 生物学 Q1 MYCOLOGY Ima Fungus Pub Date : 2024-02-10 DOI:10.1186/s43008-023-00131-8
Yongdong Dai, Siqi Chen, Yuanbing Wang, Yao Wang, Zhuliang Yang, Hong Yu
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Abstract

Ophiocordyceps sinensis is a famous traditional Chinese medicine adapted to the alpine environment of the Qinghai-Tibet Plateau and adjacent regions. Clarification of the species diversity of Ophiocordyceps sinensis and its relatives could expand the traditional medicinal resources and provide insights into the speciation and adaptation. The study is prompted by the discovery of a new species, O. megala, described here from a biodiversity hotspot in the Hengduan Mountains, China. Combined morphological, ecological, and phylogenetic evidence supports its distinctiveness from O. sinensis, O. xuefengensis, and O. macroacicularis. Additionally, based on the phylogenetic construction of Ophiocordyceps, a special clade was focused phylogenetically on the more closely related O. sinensis complex, which was defined as the O. sinensis- species complex lineage. A total of 10 species were currently confirmed in this lineage. We made a comprehensive comparison of the sexual/asexual morphological structures among this species complex, distinguishing their common and distinctive features. Furthermore, using the method of species distribution modelling, we studied the species ocurrences in relation to climatic, edaphic, and altitudinal variables for the eight species in the O. sinensis-species complex, and determined that their potential distribution could extend from the southeastern Qinghai-Tibet Plateau to the Xuefeng Mountains without isolating barrier. Thus, the biodiversity corridor hypothesis was proposed around the O. sinensis-species complex. Our study highlights the phylogeny, species diversity, and suitable distribution of the O. sinensis-species complex lineage, which should have a positive implication for the resource discovery and adaptive evolution of this unique and valuable group.

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中华麦角菌种群(子囊菌目,下囊菌科)的分子系统学,发现新物种并预测物种分布。
冬虫夏草是适应青藏高原及其邻近地区高寒环境的名贵中药材。厘清中华麦冬及其近缘种的物种多样性,可以拓展传统药材资源,并为物种的演化和适应性研究提供启示。本研究的起因是在中国横断山脉的生物多样性热点地区发现了一个新物种--O. megala。综合形态学、生态学和系统发育证据,该物种有别于O. sinensis、O. xuefengensis和O. macroacicularis。此外,根据冬虫夏草的系统发育结构,在与冬虫夏草亲缘关系更近的中华冬虫夏草复合体上建立了一个特殊支系,并将其定义为中华冬虫夏草-种复合体系。目前该支系中共有 10 个物种。我们对这一物种群的有性/无性形态结构进行了全面比较,区分了它们的共同特征和不同特征。此外,我们还利用物种分布模型的方法,研究了O. sinensis物种群中8个物种的出现与气候、土壤和海拔变量的关系,确定了它们的潜在分布范围可以从青藏高原东南部延伸到雪峰山,且没有隔离屏障。因此,提出了围绕中华鸥种群的生物多样性走廊假说。我们的研究强调了中华鸥种群的系统发育、物种多样性和适宜分布,这对这一独特而珍贵的类群的资源发现和适应性进化具有积极意义。
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来源期刊
Ima Fungus
Ima Fungus Agricultural and Biological Sciences-Agricultural and Biological Sciences (miscellaneous)
CiteScore
11.00
自引率
3.70%
发文量
18
审稿时长
20 weeks
期刊介绍: The flagship journal of the International Mycological Association. IMA Fungus is an international, peer-reviewed, open-access, full colour, fast-track journal. Papers on any aspect of mycology are considered, and published on-line with final pagination after proofs have been corrected; they are then effectively published under the International Code of Nomenclature for algae, fungi, and plants. The journal strongly supports good practice policies, and requires voucher specimens or cultures to be deposited in a public collection with an online database, DNA sequences in GenBank, alignments in TreeBASE, and validating information on new scientific names, including typifications, to be lodged in MycoBank. News, meeting reports, personalia, research news, correspondence, book news, and information on forthcoming international meetings are included in each issue
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