卫矛科南蛇藤属(Celastrus L.)分子系统学与生物地理学研究

南蛇藤属为卫矛科重要的木质藤本植物，我国是该属的现代分布中心和多样性中心。由于南蛇藤属形态性状上巨大的变异幅度和复杂的变异式样，前人基于形态分类研究提出的各分类系统之间存在较大分歧。由于取样不足和基因片断偏少等问题，前人分子系统学研究结果难以支撑我们对这一地理分布独特的类群在形态性状演化、系统发育和分类等方面的进一步探讨，也无法开展本属的生物地理学研究。本研究将在良好的前期工作基础上，基于全面的物种取样与两个基因组的10个序列片段，用最大简约法、最大似然法和贝叶斯分析重建南蛇藤属系统发育树，在此基础上分析南蛇藤属形态性状演化规律，确定其与雷公藤属系统发育关系，结合化石和古生物学资料推断属内分支的分化时间，重建南蛇藤属祖先分布区。本项目的实施将为卫矛科的系统学与生物地理学研究、资源利用与保护以及揭示植物多样性在地球上的产生与发展提供依据。

Celastrus L. is an important woody scandent of Celastraceae, whose dispersal center and diversity center is located in China. Several morphological-based classification schemes were proposed but conflicted to each other, mainly because of huge variation range and complicated variation pattern among morphological characters in Celastrus. For the sake of poorly sampled and a few gene markers used, results of previous studies can’t support further study about the law of morphological evolution, phylogeny, taxonomy and biogeography of the genus. The present study aims at reconstruct phylogeny of Celastrus by different methods (Maximum parsimony, Maximum likelihood, and Bayesian inference), analyze morphology evolution, elucidate its relationship with Tripterygium J.D. Hooker, infer clade divergence time, and reconstruct ancestral area of the genus based on large scale samples and 10 DNA markers from nuclear and chloroplast. This project will greatly contribute to further studies of molecular phylogenetic and biogeography, giving directions for optimal use and conservation of plant resources of Celastraceae, and will present important reference in revealing the origin and development of plant diversity on the earth.