Restriction-site associated DNA sequencing data reveal a radiation of willow species(Salix L.,Salicaceae)in the Hengduan Mountains and adjacent areas  

作　　者：Li He Natascha Dorothea Wagner Elvira Horandl 

机构地区：[1]College of Forestry,Fujian Agriculture and Forestry University,Fuzhou 350002,China [2]Department of Systematics,Biodiversity and Evolution of Plants(with Herbarium),University of Goettingen,Gottingen,Germany [3]College of Biological Sciences and Technology,Beiji ng Forestry University,Beijing 100083,China

出　　处：《Journal of Systematics and Evolution》2021年第1期44-57,共14页植物分类学报（英文版）

基　　金：This study was financially supported by the German Research Foundation"Deutsche Forschungsgemei nschaft"(DFG project Ho 5462-7-1 to E.H.),by the National Natural Science Foundation of China(grant No.31800466 to L.H.),and the Natural Science Foundation of Fujian Province of China(grant No.2018J01613 to L.H.).L.H.was sponsored by the China Scholarship Council for his research visit at the University of Goettingen(201707870015).

摘　　要：The Hengduan Mountains(HDM)in China are an important hotspot of plant diversity and endemism,and are considered to be a secondary diversification center for the woody plant genus Salix L.(Salicaceae).Here we aimed to reconstruct the spatiotemporal evolution of the Salix Chamaetia-Vetrix clade in the HDM and to test for the occurrence of a local radiation.We inferred phylogenetic relationships based on more than 34000 restriction-site associated DNA loci from 27 species.Phylogenetic analyses recovered a well-resolved tree topology with two major clades,the Eurasian clade and the HDM clade,with a divergence time of ca.23.9 Ma.Species in the HDM clade originated in the northern part of the range and adjacent areas,and then dispersed into the southern HDM,westwards to the Himalayas and eastwards to the Qinling Mountains.Niche modelling analyses reveal that range contractions occurred in the northern areas during the last glacial maximum,while southward expansions resulted in range overlaps.Reconstructions of character evolution related to plant height,in florescence,and flower morphology suggest that adaptations to altitudinal distribution contributed to the diversification of the HDM willows.Our data support the occurrence of a radiation in the HDM within the Salix Chamaetia-Vetrix clade.Dispersal within the mountain system,and to adjacent regions,in addition to survival in glacial refugia shaped the biogeographical history of the clade,while adaptations of the HDM willows along an altitudinal gradient could be important ecological factors explaining the high species diversity of Salix in this area.

关 键 词：Chamaetia-Vetrix clade divergence time morphological adaptation mountain radiation PHYLOGENOMICS Qinghai-Tibetan Plateau 

分 类 号：Q94[生物学—植物学]