Restriction-site associated DNA sequencing data reveal a radiation of willow species (Salix L., Salicaceae) in the Hengduan Mountains and adjacent areas
Restriction-site associated DNA sequencing data reveal a radiation of willow species (Salix L., Salicaceae) in the Hengduan Mountains and adjacent areas
复制标题
限制位点相关DNA测序数据揭示了横断山脉及邻近地区柳树物种（柳属，杨柳科）的辐射
DOI：
10.1111/jse.12593
复制
发表时间：
2020-05-25
影响因子：
3.7
通讯作者：
Hoerandl, Elvira
中科院分区：
文献类型：
--
作者：
He, Li;Wagner, Natascha Dorothea;Hoerandl, Elvira
横断山区是中国植物多样性和特有性的重要研究热点，也是木本植物柳属（Salix L.）（杨柳科（Salicaceae））。在这里，我们的目的是重建的时空演化的柳Chamaetia-Veetrium分支的HDM和测试的发生，当地的辐射。我们推断系统发育关系的基础上超过34 000限制性位点相关的DNA位点从27个物种。系统发育分析恢复了一个很好的解决树拓扑结构与两个主要的分支，欧亚分支和HDM分支，与分歧时间约。23.9 MA. HDM分支中的物种起源于分布区的北方部分和邻近地区，然后扩散到HDM南部，西至喜马拉雅山脉，东至秦岭。生态位模型分析表明，末次盛冰期期间，北方地区发生了范围收缩，而向南的扩张则导致了范围重叠。重建的字符进化相关的株高，花序，花形态表明，适应海拔分布的HDM柳树的多样化。我们的数据支持发生的辐射在HDM内柳Chamaetia-Veetum分支。除了在冰川避难所生存外，山地系统内的扩散以及向邻近地区的扩散形成了该分支的地理历史，而HDM柳树沿着海拔梯度的适应可能是解释该地区柳属物种多样性高的重要生态因素。
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 34 000 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, inflorescence, 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.