A fully resolved backbone phylogeny reveals numerous dispersals and explosive diversifications throughout the history of Asteraceae
A fully resolved backbone phylogeny reveals numerous dispersals and explosive diversifications throughout the history of Asteraceae
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DOI：
10.1073/pnas.1903871116
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发表时间：
2019-07-09
影响因子：
11.1
通讯作者：
Funk, Vicki A.
中科院分区：
文献类型：
--
作者：
Mandel, Jennifer R.;Dikow, Rebecca B.;Funk, Vicki A.
向日葵家族，菊科，占所有开花植物物种的10%，并显示出令人难以置信的多样性。菊科显然是单系的，但解决家庭内的系统发育关系已被证明是困难的，阻碍了我们了解其起源和多样化的能力。最近的分子钟测年表明它起源于白垩纪，但由于缺乏对整个家族的许多基因和代表性类群的深入采样，阻碍了对导致其全球分布和巨大多样性的迁移路线和多样化的解决。在这里，我们使用来自256个终端的基因组数据来估计进化关系，多样化的时间和地理模式。我们的研究将菊科的起源定位在白垩纪晚期的8300万年前，并揭示了该家族在始新世期间经历了一系列爆炸性辐射，伴随着多样化率的加速。近95%的现存物种起源于始新世中期，并开始多样化，与此期间随之而来的显着冷却相一致。系统发育和地理分析支持该科起源于南美洲，随后扩散到北美，然后到亚洲和非洲，后来在许多方向上进行了多个世界范围的扩散。始新世中期的快速多样化与地理范围向非洲的转移是一致的，许多现代部落似乎起源于非洲。我们强大的进化提供了一个框架，为未来的研究，旨在了解的宏观进化模式和过程中产生的巨大的物种多样性的菊科的作用。
The sunflower family, Asteraceae, comprises 10% of all flowering plant species and displays an incredible diversity of form. Asteraceae are clearly monophyletic, yet resolving phylogenetic relationships within the family has proven difficult, hindering our ability to understand its origin and diversification. Recent molecular clock dating has suggested a Cretaceous origin, but the lack of deep sampling of many genes and representative taxa from across the family has impeded the resolution of migration routes and diversifications that led to its global distribution and tremendous diversity. Here we use genomic data from 256 terminals to estimate evolutionary relationships, timing of diversification(s), and biogeographic patterns. Our study places the origin of Asteraceae at similar to 83 MYA in the late Cretaceous and reveals that the family underwent a series of explosive radiations during the Eocene which were accompanied by accelerations in diversification rates. The lineages that gave rise to nearly 95% of extant species originated and began diversifying during the middle Eocene, coincident with the ensuing marked cooling during this period. Phylogenetic and biogeographic analyses support a South American origin of the family with subsequent dispersals into North America and then to Asia and Africa, later followed by multiple worldwide dispersals in many directions. The rapid mid-Eocene diversification is aligned with the biogeographic range shift to Africa where many of the modern-day tribes appear to have originated. Our robust phylogeny provides a framework for future studies aimed at understanding the role of the macroevolutionary patterns and processes that generated the enormous species diversity of Asteraceae.