海仙报春复合体(报春花属)中国西南-台湾间断分布形成机制及异型花柱演化

中国西南与台湾地区的间断分布非常有助于理解东亚物种起源、演化以及生物多样性形成和维持机制。现有的研究表明台湾的一些物种起源于全球生物多样性热点地区之一的中国西南地区，由于气候变化等诸多因素使得两地部分植物区系呈现间断分布的格局，但还需要更多的例子来阐明间断分布的形成机制。海仙报春复合体是异型花柱植物报春花属的一个单系类群，呈中国西南-台湾间断分布，且花柱类型在不同分布区出现分化，西南分布的3个物种为二型花柱，台湾分布的1个物种为同型花柱。因此，本项目将开展cpDNA和RAD-seq测序来研究海仙报春复合体物种在中国西南-台湾间断分布格局的谱系地理结构和种群历史动态，并整合生态位模型追溯异型花柱的演化历史和驱动因素。本研究的完成将加强对海仙报春复合体在中国西南-台湾间断分布格局的形成机制以及在地质历史和气候变化下异型花柱演化的认识，为深入了解东亚植物多样性起源与地理演化提供重要参考价值。

Southwest China-Taiwan disjunction in East Asia is a striking example to understand origination and species biodiversity in these two regions. Many Taiwanese species are predominately of Southwest China origin, which is one of the most famous biodiversity hotspot in the world, but more cases are needed to explore the mechanisms underlying the disjunct distribution of plants between Taiwan and Himalaya-southwestern China. The monophyletic Primula poissonii complex (Primula, Primulaceae) is an idea taxon to understand the mechanism explaining this kind of disjunction. Four species of P. poissonii complex show Southwest China-Taiwan disjunction with three heterostylous species in Southwest China and one homostylous species in Taiwan. We will reconstruct phylogeographical structure of P. poissonii complex, and the population history based on cpDNA and RAD-seq data, with combining ecological niche modeling and population evolutional analysis, trace demographic history of species among this complex, and elucidate the historical factors shaping their genetic distribution pattern and evolution. Our study will greatly improve our understanding on the phylogeographic evolution of P. poissonii complex and its heterostylous evolution in the background of geological history and climate changes. We thus will provide new insights into the origin of the disjunction between Taiwan and Southwestern China.