Phylogenetics and biogeography of Nephrolepis- a tale of old settlers and young tramps
Phylogenetics and biogeography of Nephrolepis- a tale of old settlers and young tramps
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DOI：
10.1111/j.1095-8339.2010.01076.x
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发表时间：
2010-10-01
影响因子：
2.4
通讯作者：
Schneider, Harald
中科院分区：
文献类型：
--
作者：
Hennequin, Sabine;Hovenkamp, Peter;Schneider, Harald
利用rbcL、RPS4+RPS4-TRNS基因间隔区(IGS)和trnG内含子+trnG-trnR间隔区(IGS)3个区域的叶绿体DNA数据，研究了热带观赏蕨属Nephroepis的系统发育关系和生物地理史。我们的分类单元样本包括该属19种植物中除一种以外的所有种。我们确认了Nephroepis的单系性，解决了属下关系，提出了分布广泛的种Nephroepis Biserrata和Nephroepis abrupta的单系性，等待更密集的Nephroepis cordifolia和Nephroepis undulata的样本。Lomariopsidaceae中包含有争议的Nephroepis并没有得到明确的支持。为了确定检索到的分支的突触形态，我们重建了肾小球的索状位置和内丝形状的进化。最后，基于对该属分化时间的估计和祖先分布的重建，我们提出了始新世老挝热带森林中冠群的起源，从那里两个主要谱系可能已经分散并成为孤立的，一个在新热带地区，另一个在亚洲-澳大拉西亚。从这种清晰的生物地理格局来看，一些物种，可能起源于亚洲-澳大拉西亚，显示出最近的范围扩大，现在横跨古热带或泛热带。(C)2010年伦敦林尼安学会，《林尼安学会植物学杂志》，2010年，164,113-127。
The phylogenetic relationships and biogeographical history of the tropical genus Nephrolepis, a popular ornamental fern, are investigated using plastid DNA data from three regions: rbcL, rps4 plus the rps4-trnS intergenic spacer (IGS) and the trnG intron plus the trnG-trnR IGS. Our taxon sampling includes all but one of the 19 species of the genus. We confirm the monophyly of Nephrolepis, resolve infrageneric relationships and propose monophyly of the widespread species Nephrolepis biserrata and Nephrolepis abrupta, awaiting a denser sampling of Nephrolepis cordifolia and Nephrolepis undulata. The controversial inclusion of Nephrolepis in Lomariopsidaceae is not clearly supported. With a view to identifying synapomorphies for the clades retrieved, we reconstruct the evolution in Nephrolepis of sorus position and indusium shape. Finally, based on an estimation of divergence times and reconstruction of ancestral distributions for the genus, we propose an origin of the crown group in the Eocene in the forests of the Laurasian tropical belt, from where two main lineages would have dispersed and become isolated, one in the Neotropics and the other in Asia-Australasia. From this clear biogeographical pattern, some species, probably of Asian-Australasian origin, show recent range expansions, now spanning the Palaeotropics or the pantropical zone. (C) 2010 The Linnean Society of London, Botanical Journal of the Linnean Society, 2010, 164, 113-127.