东亚—北美间断分布草本菝葜类群的物种形成和谱系地理学研究

草本菝葜为一年生林下草本，具有独特的东亚—北美西部—北美东部间断分布模式（在三地区分别有2、1、8种），是研究中第三纪北半球中生森林（东亚、北美东部植物区系的前身）的动态历史以及如何响应环境变化的理想模型。本研究拟利用cpDNA、ITS与基于下一代测序技术的RAD tags标记，通过谱系地理学和景观遗传学的理论和方法，研究该类群的物种形成、谱系分化、群体动态历史、驱动生态因子，揭示自第三纪中期以来东亚—北美间断分布形成的历史原因、进化动力，为东亚、北美植物区系的交流和变化历史提供新的证据。

Herbaceous Smilax [Smilax sect. Nemexia (Raf.) A. DC.] are annual understory herbs with a unique eastern Asia-western North America-eastern North America disjunct pattern (two, one and eight species in these three areas, respectively). The critical geographical distribution pattern (intercontinental and intracontinental disjunction) makes it an ideal model to test dynamic history of mid-Tertiary mesophytic forest flora in the north hemisphere and how it responds to environmental oscillation since then. This study will take herbaceous Smilax as a testing model, using cpDNA, ITS and RAD tags to study the speciation, lineage divergence, dynamic history of population geographic structure, and impulsive ecological factors, to reveal the cause of disjunction formation and evolutionary impetus of eastern Asian and North American flora since middle Tertiary. This study will provide new evidence for the floral exchange and variation history among eastern Asia and North America.