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并非那么年轻：结合质体系统发育基因组学、板块构造学和化石证据表明苏铁科在古近纪的多样化。

Not that young: combining plastid phylogenomic, plate tectonic and fossil evidence indicates a Palaeogene diversification of Cycadaceae.

机构信息

CAS Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China.

Department of Economic Plants and Biotechnology, Yunnan Key Laboratory for Wild Plant Resources, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, Yunnan, China.

出版信息

Ann Bot. 2022 Jan 28;129(2):217-230. doi: 10.1093/aob/mcab118.

DOI:10.1093/aob/mcab118
PMID:34520529
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8796677/
Abstract

BACKGROUND AND AIMS

Previous molecular dating studies revealed historical mass extinctions and recent radiations of extant cycads, but debates still exist between palaeobotanists and evolutionary biologists regarding the origin and evolution of Cycadaceae.

METHODS

Using whole plastomic data, we revisited the phylogeny of this family and found the Palawan endemic Cycas clade was strongly related to all lineages from Southeast Eurasia, coinciding with a plate drift event occurring in the Early Oligocene. By integrating fossil and biogeographical calibrations as well as molecular data from protein-coding genes, we established different calibration schemes and tested competing evolutionary timelines of Cycadaceae.

KEY RESULTS

We found recent dispersal cannot explain the distribution of Palawan Cycas, yet the scenario including the tectonic calibration yielded a mean crown age of extant Cycadaceae of ~69-43 million years ago by different tree priors, consistent with multiple Palaeogene fossils assigned to this family. Biogeographical analyses incorporating fossil distributions revealed East Asia as the ancestral area of Cycadaceae.

CONCLUSIONS

Our findings challenge the previously proposed Middle-Late Miocene diversification of cycads and an Indochina origin for Cycadaceae and highlight the importance of combining phylogenetic clades, tectonic events and fossils for rebuilding the evolutionary history of lineages that have undergone massive extinctions.

摘要

背景与目的

先前的分子年代学研究揭示了现存苏铁类植物的历史大灭绝和近期辐射，但古植物学家和进化生物学家之间仍存在关于苏铁科起源和演化的争论。

方法

利用全质体基因组数据，我们重新研究了该科的系统发育，发现巴劳安特有苏铁类群与来自东南亚的所有谱系密切相关，这与早渐新世发生的板块漂移事件相吻合。通过整合化石和生物地理校准以及来自蛋白质编码基因的分子数据，我们建立了不同的校准方案，并测试了苏铁科的竞争进化时间线。

主要结果

我们发现近期的扩散不能解释巴劳安特有苏铁的分布，但包括构造校准的情景得出了现存苏铁科的冠群年龄约为 6900 万至 4300 万年前，这与多个被归入该科的古近纪化石一致。包含化石分布的生物地理分析显示东亚是苏铁科的原始分布区。

结论

我们的研究结果挑战了先前提出的苏铁类植物中晚中新世多样化和苏铁科起源于印度支那的假说，并强调了将进化枝的系统发育分支、构造事件和化石相结合，对于重建经历大规模灭绝的谱系的进化历史的重要性。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7dbf/8796677/243a89b59060/mcab118f0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7dbf/8796677/71df15d2fbe3/mcab118f0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7dbf/8796677/020441a10f51/mcab118f0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7dbf/8796677/1e6b1efa0dc3/mcab118f0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7dbf/8796677/58d283ef7b07/mcab118f0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7dbf/8796677/243a89b59060/mcab118f0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7dbf/8796677/71df15d2fbe3/mcab118f0001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7dbf/8796677/020441a10f51/mcab118f0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7dbf/8796677/1e6b1efa0dc3/mcab118f0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7dbf/8796677/58d283ef7b07/mcab118f0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7dbf/8796677/243a89b59060/mcab118f0005.jpg

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