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Evolutionary biogeography on Ophiocordyceps sinensis:An indicator of molecular phylogeny to geochronological and ecological exchanges

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Geoscience Frontiers 2020年第3期11卷 807-820页

作者： Yongdong Dai Changkui Wu Feng Yuan Yuanbing Wang Luodong Huang Zihong Chen Wenbo Zeng Yao Wang Zhuliang Yang Pusheng Zeng paul lemetti Xuanxue Mo Hong Yu Yunnan Herbal Laboratory Institute of Herb Biotic ResourcesSchool of Life SciencesYunnan UniversityKunmingYunnan Province 650091China Yunnan Herbal Biotech Co. LtdKunmingYunnan Province 650203China Key Laboratory for Plant Diversity and Biogeography of East Asia Kunming Institute of BotanyChinese Academy of SciencesKunmingYunnan Province 650201China National Research Center for Geoanalysis Beijing 100037China School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100083China

The fungus Ophiocordyceps sinensis is endemic to the vast region of the Qinghai-Tibetan plateau(QTP).The unique and complex geographical environmental conditions have led to the "sky island" distribution structure of *** to limited and unbalanced sample collections,the previous data on *** regarding its genetic diversity and spatial structure have been deemed *** this study,we analyzed the diversity and phylogeographic structures of *** using internally transcribed spacer region(ITS) and 5-locus datasets by a large-scale sampling.A total of 111 haplotypes of ITS sequences were identified from 948 samples data of the fungus ***,with representing high genetic diversity,and 8 phylogenetic clades were recognized in *** the southeastern Tibet and the northwestern Yunnan were the centers of genetic diversity and genetic differentiation of the fungus,and they were inferred as the glacial refugia in the *** distribution patterns were identified to correspond to the 8 clades,including but not limited to the coexistence of widely and specific local distributive *** also revealed that the differentiation pattern of *** did not fit for the isolation-by-distance *** differentiation into the 8 clades occurred between 1.56 Myr and6.62 *** ancestor of *** most likely originated in the late Miocene(6.62 Myr) in the northwestern Yunnan,and the Scene A-C of the Qinghai-Tibetan movements may have played an important role in the differentiation of *** during the late Miocene-Pliocene *** current results provide a much clearer and detailed understanding of the genetic diversity and geographical spatial distribution of the endemic alpine fungus *** also revealed that the geochronology resulting from paleogeology could be cross-examined with biomolecular clock at a finer scale.

关键词： Large-scale sampling Phylogeographic structure Molecular clock Correlation Qinghai-Tibetan plateau

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