摘要:东亚地区经历过复杂的地质事件及气候变化，针对东亚地区进行专科专属的植物区系及地理演化研究具有重要的意义。基于3个叶绿体片段（psbA-trnH、rpl16和trnL-trnF），对主要分布于东亚地区的鸡爪槭组（section Palmata Pax）18个分类群的分化时间、祖先地理分布、物种扩散路径等进行了分析。叶绿体片段总长度为2，232bp，其中变异位点341个（15.2%），有效信息位点231个（10.3%）；18个鸡爪槭组内物种（包含亚种）被高度支持为单系群（99/95/1.0），且组内物种间的支持度相对较高；鸡爪槭组内出现物种分化的时间多集中于中新世时期，组内物种的多样性速率保持相对稳定；根据BioGeoBears分析得出，东亚大陆局部地区是该组物种的祖先分布区，且现今分布于岛屿的物种分布在不同分支。通过讨论与分析得出：我国西南地区可能是鸡爪槭组植物的起源地；东海陆桥隐没与抬升，直接影响着鸡爪槭组物种的迁移与扩散；分布于亚热带亚洲大陆的鸡爪槭组物种，存在多次往同纬度高海拔地区扩散的现象。该研究有助于对东亚地区植物生物地理历史的进一步了解。



Abstract:As being impacted by complex geological events and climate change, it is of considerable significance to study the flora and biogeography of East Asia. In this study, the phylogeny of 18 species and subspecies of Acer Sect. Palmata were reconstructed to infer the biogeographic history in East Asia, using three DNA chloroplast fragments (psbA-trnH, rpl16 and trnL-trnF). With 341 (15.2%) mutation sites and 231 (10.3%) effective information sites in a total length of 2,232 bp, these 18 taxa were highly supported as a monophyletic group. The divergence of species within Sect. Palmata was mostly concentrated in the Miocene, but even then, the diversification rate remained stable. It is speculated that the ancestral area of Sect. Palmata is on the East-Asian continent, while island species are distributed in different branches. Phylogenetic analyses showed that Southwest China is the center of origin of Sect. Palmata. The occurrence of East China Sea landbridge during the Last Glacial Maximum (LGM) affected dispersal and colonization of species in East Asia directly (e.g., A. japonicum, A. oliverianum subsp. formosanum and A. tutcheri). Multiple upward expansion of species at the same latitude were appeared in Sect. Palmata on subtropical Asian continent. This study is helpful to the further understanding of the phytogeography in East Asia.





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