Molecular phylogeography of four endemic Sagittaria species (Alismataceae) in the Sino-Japanese Floristic Region of East Asia
Molecular phylogeography of four endemic Sagittaria species (Alismataceae) in the Sino-Japanese Floristic Region of East Asia
复制标题
东亚中日植物区系四种慈姑特有种（泽泻科）的分子系统发育地理学
DOI：
10.1111/boj.12351
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发表时间：
2016-01-01
影响因子：
2.4
通讯作者：
Chen, Jin-Ming
中科院分区：
文献类型：
--
作者：
Liao, Yi-Ying;Gichira, Andrew Wanyoike;Chen, Jin-Ming
为了揭示第四纪气候振荡在中国大陆温带中日植物区系现代植物多样性形成中的作用，利用质体DNA非编码区（psbA-trnH、rpl 16内含子和trnC-ycf 6）和核核糖体DNA内转录间隔区（nrITS）序列分析了该地区慈姑属（Sagittaria）4种植物的地理分布格局。基于这两个数据集，四个研究物种之间的分歧时间估计落在晚第三纪（质体DNA：7.1-13.7 Mya; ITS：11.1-16.1 Mya）。祖先分布分析表明，地形、气候和生态条件差异较大的横断山区、华中地区和华东地区是地方病的起源地。不匹配分布分析表明，每个物种都经历了响应第四纪气候振荡的范围扩大。我们的研究结果与当地慈姑属第四纪起源的假设相矛盾;我们支持北方半球的现代物种大多起源于第三纪的观点。分布区的扩展可能深刻地改变了慈姑属植物在中日植物区系中的分布区。(C)2015年，伦敦林奈学会，林奈学会植物学杂志，2015年，180，6-20。
To reveal the role of climate oscillations of the Quaternary in forming the contemporary plant diversity in the temperate Sino-Japanese Floristic Region of mainland China, we assess the phylogeographical patterns of four Sagittaria species in the region using sequence data from plastid DNA non-coding regions (psbA-trnH, the rpl16 intron and trnC-ycf6) and the internal transcribed spacers of nuclear ribosomal DNA (nrITS). Based on both datasets, the divergence time among the four studied species was estimated to fall in the Late Tertiary (plastid DNA: 7.1-13.7 Mya; ITS: 11.1-16.1 Mya). The ancestral distribution analyses revealed that regions with a great diversity in topography, climate and ecological conditions, e.g. the Hengduan Mountains, Central China and East China, were the areas where the endemics originated. Mismatch distribution analyses revealed that each species had experienced a range expansion in response to Quaternary climatic oscillations. Our findings contradict the hypothesis of Quaternary origins of the endemic Sagittaria spp.; we support the view that modern species in the Northern Hemisphere originated mostly during the Tertiary. Range expansion may have profoundly modified the current distribution ranges of Sagittaria species in the Sino-Japanese Floristic Region. (C) 2015 The Linnean Society of London, Botanical Journal of the Linnean Society, 2015, 180, 6-20.