Accelerated evolution of early angiosperms: Evidence from ranunculalean phylogeny by integrating living and fossil data
Accelerated evolution of early angiosperms: Evidence from ranunculalean phylogeny by integrating living and fossil data
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早期被子植物的加速进化：通过整合活体和化石数据从毛茛动物系统发育中得到的证据
DOI：
10.1111/jse.12090
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发表时间：
2016-07-01
影响因子：
3.7
通讯作者：
Chen, Zhi-Duan
中科院分区：
文献类型：
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作者：
Wang, Wei;Dilcher, David L.;Chen, Zhi-Duan
中国东北热河生物群被子植物化石的新发现，有助于我们对有花植物起源和早期演化的认识。最早的具有生殖器官的真双子叶植物属Leefrandom最近被记录于125.8-123.0 Ma的下白垩统义县组，并根据大体形态重新被认为与现存的毛茛科（Ranunculaceae）接近。然而，这一假设尚未使用分支系统方法进行验证。为了确定可能的盟友Leefrandoms现存的真双子叶植物，我们构建了一个66形态数据矩阵。结合对毛茛目现存植物的分子和形态学分析，认为该植物与毛茛科植物有亲缘关系。真双子叶植物最早的化石记录是127-125 Ma，基于三沟花粉。因此，我们提出了一个假设，基础真双子叶植物可能经历了加速的演变和多样化，在最新的Barremian和最早的Aptian，导致至少6个现存的家庭或血统，10-15万年前比目前记录的干组。被子植物自起源以来经历了多次不均匀的辐射脉冲。许多关键的性格创新发生在不同的阶段，可能与各种生物和非生物因素一起触发这些辐射。
The new discovery of angiosperm remains in the Jehol Biota of northeastern China contributes to our understanding of the origin and early evolution of flowering plants. The earliest eudicot genus with reproductive organs, Leefructus, was recently documented from the Lower Cretaceous Yixian Formation at 125.8–123.0 Ma, and was reconsidered to be close to the extant family Ranunculaceae based on gross morphology. However, this hypothesis has not been tested using a cladistic approach. To determine the possible allies of Leefructus within extant eudicots, we constructed a 66 morphological data matrix. Molecular and morphological analyses of extant Ranunculales combined with the fossil suggest that it has an affinity with the Ranunculaceae. The earliest fossil record of the eudicots is 127–125 Ma based on tricolpate pollen grains. Thus, we suggest a hypothesis that the basal eudicots might have experienced an accelerated evolution and diversification during the latest Barremian and earliest Aptian, leading to the stem groups of at least six extant families or lineages, 10–15 Myr earlier than currently documented. Angiosperms have undergone multiple uneven pulses of radiation since their origin. Many key character innovations occurred in different stages that could have triggered those radiations in concert with various biotic and abiotic factors.