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Wind-dispersed seeds blur phylogeographic breaks:The complex evolutionary history of Populus lasiocarpa around the Sichuan Basin

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Plant Diversity 2023年第2期45卷 156-168页

作者： Xue Li markus ruhsam Yi Wang Hong-Ying Zhang Xiao-Yan Fan Lei Zhang Jing Wang Kang-Shan Mao Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education College of Life SciencesState Key Laboratory of Hydraulics and Mountain River EngineeringSichuan UniversityChengdu 610065SichuanPR China Royal Botanic Garden Edinburgh 20A Inverleith RowEdinburgh EH35LRUK

The strength of phylogeographic breaks can vary among species in the same area despite being subject to the same geological and climate history due to differences in biological *** important phylogeographic breaks exist around the Sichuan Basin in Southwest China but few studies have focused on wind-dispersed ***,we investigated the phylogeographic patterns and the evolutionary history of Populus lasiocarpa,a wind-pollinated and wind-dispersed tree species with a circum-Sichuan Basin distribution in southwest *** sequenced and analyzed three plastid DNA fragments(ptDNA) and eight nuclear microsatellites(nSSRs) of 265 individuals of *** from 21 populations spanning the entire distribution *** patterns based on nSSR data revealed that there are three genetic groups in *** is consistent with the three phylogeographic breaks(Sichuan Basin,the Kaiyong Line and the 105°E line),where the Sichuan basin acts as the main barrier to gene flow between western and eastern ***,the distribution pattern based on ptDNA haplotypes poorly matched the phylogeographic breaks,and wind-dispersed seeds may be one of the main contributing *** distribution modelling suggested a larger potential distribution in the last glacial maximum with a severe bottleneck during the last interglacial.A DIYABC model also suggested a population contraction and expansion for both western and eastern *** results indicate that biological traits are likely to affect the evolutionary history of plants,and that nuclear molecular markers,which experience higher levels of gene flow,might be better indicators of phylogeographic breaks.

关键词： Phylogeography Sichuan basin Populus lasiocarpa Kaiyong line Demographic history

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Reproduction and genetic diversity of Juniperus squamata along an elevational gradient in the Hengduan Mountains

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Plant Diversity 2022年第4期44卷 369-376页

作者： Tsam Ju Zhi-Tong Han markus ruhsam Jia-Liang Li Wen-Jing Tao Sonam Tso Georg Miehe Kang-Shan Mao Key Laboratory of Bio-Resource and Eco-Environment of Ministry of Education College of Life SciencesState Key Laboratory of Hydraulics and Mountain River EngineeringSichuan UniversityChengduSichuan 610065China Royal Botanic Garden Edinburgh 20A Inverleith RowEdinburgh EH35LRUK College of Science Tibet UniversityLhasaTibet 850000China Department of Geography Philipps-Universitat MarburgDeutschhausstraße 10Marburg 35032HessenGermany

Elevation plays a crucial factor in the distribution of plants,as environmental conditions become increasingly harsh at higher *** studies have mainly focused on the effects of large-scale elevational gradients on plants,with little attention on the impact of smaller-scale *** this study we used 14 microsatellite loci to survey the genetic structure of 332 Juniperus squamata plants along elevation gradient from two sites in the Hengduan *** found that the genetic structure(single,clonal,mosaic)of *** shrubs is affected by differences in elevational gradients of only 150 *** in the mid-elevation plots rarely have a clonal or mosaic structure compared to shrubs in lower-or higher-elevation *** activity can significantly affect genetic structure,as well as reproductive strategy and genetic ***-populations at mid-elevations had the highest yield of seed cones,lower levels of asexual reproduction and higher levels of genetic *** may be due to the trade-off between elevational stress and anthropogenic disturbance at mid-elevation since there is greater elevational stress at higher-elevations and greater intensity of anthropogenic disturbance at *** findings provide new insights into the finer scale genetic structure of alpine shrubs,which may improve the conservation and management of shrublands,a major vegetation type on the Hengduan Mountains and the Qinghai-Tibet Plateau.

关键词： Fine-scale structure Juniperus squamata High elevation Human disturbance

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