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题名: Resolving the phylogenetic relationships and evolutionary history of the East Asian endemic genus Rodgersia (Saxifragaceae) using multilocus data
作者: Ma, Xiangguang1; Sun, Wenguang1; Zhu, Weidong1; Sun, Hang1
刊名: PERSPECTIVES IN PLANT ECOLOGY EVOLUTION AND SYSTEMATICS
关键词: Allopatric speciation ; Ancient introgression ; Biogeographic pattern ; East Asia ; Vicariance
英文摘要: The East Asian endemic genus Rodgersia comprises five species and several variants. These species exhibit variation in ploidy level and a fragmented distribution across the whole of East Asia. In order to explain their present distribution pattern under a robust phylogeny, we employed multiple copy nuclear genes ( ITS and ETS), cpDNA (rpl32-trnL, trnV-ndhC, ndhF-rpl32) and a low copy nuclear gene ( GBSSI) to reconstruct the species' relationships within Rodgersia. Identification of ploidy levels was also carried out for most of samples. The early-diverging positions of R. nepalensis and R. podophylla were confirmed in different gene trees. Much topological incongruence among gene trees was found in the shallower branches, which comprised the species of central-southwest China. Both incomplete lineage sorting and ancient introgression may be responsible for the incongruent pattern observed. Ancient introgressions may have occurred between diploid species and the diploid progenitors of tetraploid species in different areas of southwest China. Rodgersia probably originated in Northeast Asia during the Pliocene. This genus is a rare example in which two early-diverging species occur at opposite ends of the distribution area, likely resulting from successive vicariance events. Unlike many vicariance events shaped simply by forest fragmentation during the Pleistocene, the contemporary biogeographic pattern of Rodgersia is more the result of rapid sympatric evolution (reticulate events and polyploidization) of the taxa in the central area. (C) 2017 Elsevier GmbH. All rights reserved.
出版日期: 2017-04-01
卷号: 25, 期号:25, 页码:20-28
DOI标识: 10.1016/j.ppees.2016.12.005
语种: 英语
ISSN号: 1433-8319
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/33803
Appears in Collections:中国科学院东亚植物多样性与生物地理学重点实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers & Biogeog East Asia, 132 Lanhei Rd, Kunming 650201, Yunnan, Peoples R China

Recommended Citation:
Sun H. Resolving the phylogenetic relationships and evolutionary history of the East Asian endemic genus Rodgersia (Saxifragaceae) using multilocus data[J]. Perspectives in Plant Ecology, Evolution and Systematics,2017(25):20-28.
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