Origin of angiosperms and the puzzle of the Jurassic gap
Origin of angiosperms and the puzzle of the Jurassic gap
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被子植物的起源和侏罗纪间隙之谜
DOI：
10.1038/s41477-019-0421-0
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发表时间：
2019-05-01
期刊：
影响因子：
18
通讯作者：
Li, De-Zhu
中科院分区：
文献类型：
--
作者：
Li, Hong-Tao;Yi, Ting-Shuang;Li, De-Zhu
被子植物是到目前为止物种最丰富的陆地植物分支，但对它们的起源和早期进化史仍然知之甚少。我们基于2881个叶绿体基因组中的80个基因重建了被子植物的系统发育，这些基因组代表了现存科和所有目的85%。根据一棵解析良好的叶绿体树和62个化石定标，我们确定冠被子植物的起源于上三叠世，主要被子植物的辐射发生在侏罗纪和下白垩世。这一估计的树冠年龄大大早于明确的被子植物化石，这里的差异被称为“侏罗纪被子植物缺口”。我们的时间校准的叶绿体系统发育树为未来开花植物进化的比较研究提供了一个高度相关的框架。
Angiosperms are by far the most species-rich clade of land plants, but their origin and early evolutionary history remain poorly understood. We reconstructed angiosperm phylogeny based on 80 genes from 2,881 plastid genomes representing 85% of extant families and all orders. With a well-resolved plastid tree and 62 fossil calibrations, we dated the origin of the crown angiosperms to the Upper Triassic, with major angiosperm radiations occurring in the Jurassic and Lower Cretaceous. This estimated crown age is substantially earlier than that of unequivocal angiosperm fossils, and the difference is here termed the ‘Jurassic angiosperm gap’. Our time-calibrated plastid phylogenomic tree provides a highly relevant framework for future comparative studies of flowering plant evolution.