Colonization of the Southern Hemisphere by Sagina and Colobanthus (Caryophyllaceae)
Colonization of the Southern Hemisphere by Sagina and Colobanthus (Caryophyllaceae)
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DOI：
10.1007/s00606-021-01793-w
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发表时间：
2022-02-01
影响因子：
1.9
通讯作者：
Dillenberger，Markus S.
中科院分区：
文献类型：
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作者：
Alban，Dorian M.;Biersma，Elisabeth M.;Dillenberger，Markus S.
与羊齿蕨属（Facchinia）为姐妹属的有23种和30-33种。其中，法奇尼属分布于欧亚大陆西部，冷瓣花属几乎完全分布于南半球，萨吉尼属分布于两半球，物种多样性以欧亚大陆西部最高。我们检查：1. Sagina和Colobanthus是否为单系姐妹属，2.这两个属的起源和多少次在半球之间的扩散发生，和3。两个半球之间的殖民路线。通过对45个种共158个内群样本的核糖体内转录间隔区（ITS）和两个质体间隔区（cpDNA）序列的分析，重建了漆姑草属（Colobanthus）和漆姑草属（Sagina）的亲缘关系，并进行了分子年代测定和祖先区域重建，确定漆姑草属（Sagina）和Colobanthus为单系姐妹属。基于ITS和cpDNA的生物地理重建表明，萨金分布于南半球的澳大拉西亚或非洲。对于龙须菜，模式不太清楚，也没有得到很好的支持：ITS显示澳大拉西亚是进入的地区，但cpDNA暗示南半球可能已经进入美洲。本文从两种植物的现存分布和地理历史两个方面论述了它们的异同.这说明，即使是密切相关和生态上非常相似的谱系，也可能是高度特殊的。
Colobanthus(23 species) andSagina(30–33 species) together are sister toFacchinia. WhereasFacchiniais distributed in western Eurasia,Colobanthusis almost exclusively distributed in the Southern Hemisphere, andSaginais distributed in both hemispheres with the highest species diversity in western Eurasia. We examined: 1. WhetherSaginaandColobanthusare monophyletic sister genera, 2. Where the two genera originated and how many times dispersal between hemispheres occurred, and 3. Which colonization routes between hemispheres were taken. We reconstructed the phylogeny ofColobanthusandSaginausing nuclear ribosomal internal transcribed spacer (ITS) and two plastid spacers (cpDNA) of altogether 158 ingroup samples of 45 species, and performed molecular dating and ancestral area reconstructions.SaginaandColobanthuswere confirmed as monophyletic sister genera. Biogeographical reconstructions based on ITS and cpDNA showed thatSaginareached the Southern Hemisphere in Australasia or in Africa. ForColobanthus, patterns were less clear and less well-supported: ITS showed Australasia as the region of entry, but cpDNA implied that the Southern Hemisphere may have been entered in America. The extant distributions and the biogeographical histories ofColobanthusandSaginashow both similarities and dissimilarities. This illustrates that biogeographical histories, even of closely related and ecologically very similar lineages, can be highly idiosyncratic.