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Evolutionary history of a desert perennial Arnebia szechenyi(Boraginaceae):Intraspecific divergence,regional expansion and asymmetric gene flow

引用

Plant Diversity 2021年第6期43卷 462-471页

作者： Meng-Jiao Fu Hai-Yang Wu Dong-Rui Jia Bin Tian Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China Ministry of EducationSouthwest Forestry UniversityKunming 650224China School of Ecology and Environmental Science&Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments Yunnan UniversityKunming 650091China CAS Key Laboratory for Plant Diversity and Biogeography Kunming Institute of BotanyChinese Academy of SciencesKunming 650204China

The complex interactions of historical,geological and climatic events on plant evolution have been an important research focus for many ***,the role of desert formation and expansion in shaping the genetic structures and demographic histories of plants occurring in arid areas has not been well *** the present study,we investigated the phylogeography of Arnebia szechenyi,a desert herb showing a near-circular distribution surrounding the Tengger desert in Northwest *** measured genetic diversity of populations using three maternally inherited chloroplast DNA(cpDNA)fragments and seven bi-paternally inherited nuclear DNA(nDNA)loci that were sequenced from individuals collected from 16 natural populations across its range and modelled current and historical potential habitats of the *** data indicated a considerably high level of genetic variation within *** and noteworthy asymmetry in historical migration from the east to the ***,two nuclear genetic groups of populations were revealed,corresponding to the two geographic regions separated by the Tengger ***,analysis of cpDNA data did not show significant geographic *** most plausible explanation for the discrepancy between our findings based on cpDNA and nDNA data is that *** populations experienced long periods of geographic isolation followed by range expansion,which would have promoted generalized recombination of the nuclear *** findings further highlight the important role that the Tengger desert,together with the Helan Mountains,has played in the evolution of desert plants and the preservation of biodiversity in arid Northwest China.

关键词： Asymmetric gene flow Cytonuclear discordance desert growth Intraspecific divergence

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