青藏高原柳属植物的多样化机制

青藏高原具有丰富的柳属物种多样性，物种数量达143种，是其分布和分化中心之一，其来源可能主要为物种的就地分化和周边植物区系成分的迁入。但传统的基于少量的分子片段的系统学研究无法构建足够分辨率的系统树，阻碍了青藏高原柳属植物多样性起源的研究。本项目拟对青藏高原的柳属植物及周边植物区系的柳属代表物种进行广泛的取样，应用全基因组重测序和转录组测序的手段，构建种级水平的高分辨率的系统发育关系，阐述青藏高原柳属植物与其它植物区系柳属植物的联系、起源的时间尺度、演化历史及其多样化机制。本项目的开展将为柳属这类分类困难的植物类群的系统学研究提供参考，并为青藏高原生物多样性的起源与演化提供重要的证据和研究范式。

Qinghai-Tibet Plateau (QTP) is a distribution and diversification center of Salix (143 species). The origin of this rich species diversity may attribute to in situ diversification and immigration from other flora. However, previous phylogenetic studies based on few molecular markers failed to provide enough resolution to resolve relationships inside Salix, and therefore study of the origin of rich species diversity of Salix in QTP was hampered. In this project, we attempt to collected Salix material of QTP and other flora widely, and conduct whole-genome resequencing and RNAseq for genome-wide phylogenetic inference, and then elucidate the relationships of Salix between QTP and other flora, time of origination, and origin of its rich species diversity. Implementation of this project will provide insights for phylogeny and evolutionary studies for taxon difficult in taxonomy and systematics, as well as essential evidence and research example for origination of species diversity of QTP.