Simultaneous diversification of Polypodiales and angiosperms in the Mesozoic
Simultaneous diversification of Polypodiales and angiosperms in the Mesozoic
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DOI：
10.1111/cla.12457
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发表时间：
2021-04-15
期刊：
影响因子：
3.6
通讯作者：
Li, De-Zhu
中科院分区：
文献类型：
--
作者：
Du, Xin-Yu;Lu, Jin-Mei;Li, De-Zhu
水龙骨类约占现存蕨类物种多样性的82%，通常认为水龙骨类在晚白垩世具有多样性。我们使用惩罚似然法和贝叶斯方法估计了水龙的分化时间，数据集由代表所有28个家族和14个化石约束的208个质体组成，反映了目前对化石记录的解释。我们的质体组系统发育恢复了与最近的核系统发育相同的六个主要谱系，但Dennstaedtiineae的位置不同。目前的系统发育表明水龙骨科之间的关系有很高的分辨率，特别是在那些形成水龙骨亚科的科之间。分歧时间的估计支持水龙的最新共同祖先及其最近的近亲可以追溯到三叠纪，建立了侏罗纪的主要谱系，并可能在晚侏罗世和早白垩世加速了辐射。水龙类和被子植物的估计分化模式汇聚到其主要谱系是在白垩纪陆地革命开始前不久同时建立的情况，并进一步表明这两个谱系都存在白垩纪前的隐藏历史。这里显示的同时多样化的模式阐明了我们对塑造当今生态系统的陆地革命的理解中的一个重要差距。
Comprising about 82% of the extant fern species diversity, Polypodiales are generally believed to have diversified in the Late Cretaceous. We estimated the divergence times of Polypodiales using both penalized likelihood and Bayesian methods, based on a dataset consisting of 208 plastomes representing all 28 families and 14 fossil constraints reflecting current interpretations of fossil record. Our plastome phylogeny recovered the same six major lineages as a recent nuclear phylogeny, but the position of Dennstaedtiineae was different. The present phylogeny showed high resolution of relationships among the families of Polypodiales, especially among those forming the Aspleniineae. The divergence time estimates supported the most recent common ancestor of Polypodiales and its closest relative dating back to the Triassic, establishment of the major lineages in the Jurassic, and a likely accelerated radiation during the late Jurassic and the Early Cretaceous. The estimated divergence patterns of Polypodiales and angiosperms converge to a scenario in which their main lineages were established simultaneously shortly before the onset of the Cretaceous Terrestrial Revolution, and further suggest a pre-Cretaceous hidden history for both lineages. The pattern of simultaneous diversifications shown here elucidate an important gap in our understanding of the Terrestrial Revolution that shaped today's ecosystems.