The timescale of early land plant evolution.
The timescale of early land plant evolution.
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DOI：
10.1073/pnas.1719588115
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发表时间：
2018-03-06
影响因子：
11.1
通讯作者：
Donoghue PCJ
中科院分区：
文献类型：
--
作者：
Morris JL;Puttick MN;Clark JW;Edwards D;Kenrick P;Pressel S;Wellman CH;Yang Z;Schneider H;Donoghue PCJ
建立早期陆地植物进化的时间尺度对于检验陆地植物和地球系统共同进化的假设是必不可少的。在这里，我们建立了一个早期陆地植物进化的时间尺度，整合了竞争性的假设brandite-tracheophyte的关系。我们估计陆地植物出现在中寒武纪-早奥陶世的时间段，维管植物出现在晚奥陶世-志留纪。这一时间尺度意味着陆地生态系统的早期建立的陆地植物是在密切雅阁与最近的估计陆地动物谱系的起源。受早期陆生植物化石记录限制的生物地球化学模型，或试图解释其影响的生物地球化学模型，必须考虑更早的中寒武纪-早奥陶世起源。建立早期陆地植物进化的时间尺度对于检验陆地植物和地球系统共同进化的假设是必不可少的。早期陆地植物巨化石的稀少和地层对其分布的控制使化石记录成为不可靠的指南，只剩下分子钟。然而，分子钟方法的应用受到了目前试图解决生活brandites和维管植物之间进化关系的僵局的挑战。在这里，我们建立了一个时间尺度的早期陆地植物进化，整合了拓扑的不确定性，通过探索竞争的假设对brandite-tracheophyte关系的影响，除其他变量外，分歧时间估计。我们编纂了37个化石校准Viridiplantae遵循最佳实践。我们应用这些校准在贝叶斯放松分子钟分析的一个基因组数据集，包括胚胎的多样性和他们的亲戚在Viridiplantae。拓扑结构和数据集大小对年龄估计的影响很小，不同的时钟模型和校准策略之间的差异更大。对于所有的分析，寒武纪起源的Embryota恢复的可能性最高。冠部维管植物的估计年龄为晚奥陶世至晚志留世。这一时间尺度意味着陆地生态系统的早期建立的陆地植物是在密切雅阁与最近的估计陆地动物谱系的起源。受早期陆生植物化石记录限制的生物地球化学模型，或试图解释其影响的生物地球化学模型，必须考虑更早的中寒武纪-早奥陶世起源的含义。
Establishing the timescale of early land plant evolution is essential to testing hypotheses on the coevolution of land plants and Earth’s System. Here, we establish a timescale for early land plant evolution that integrates over competing hypotheses on bryophyte−tracheophyte relationships. We estimate land plants to have emerged in a middle Cambrian–Early Ordovocian interval, and vascular plants to have emerged in the Late Ordovician−Silurian. This timescale implies an early establishment of terrestrial ecosystems by land plants that is in close accord with recent estimates for the origin of terrestrial animal lineages. Biogeochemical models that are constrained by the fossil record of early land plants, or attempt to explain their impact, must consider a much earlier, middle Cambrian–Early Ordovician, origin. Establishing the timescale of early land plant evolution is essential for testing hypotheses on the coevolution of land plants and Earth’s System. The sparseness of early land plant megafossils and stratigraphic controls on their distribution make the fossil record an unreliable guide, leaving only the molecular clock. However, the application of molecular clock methodology is challenged by the current impasse in attempts to resolve the evolutionary relationships among the living bryophytes and tracheophytes. Here, we establish a timescale for early land plant evolution that integrates over topological uncertainty by exploring the impact of competing hypotheses on bryophyte−tracheophyte relationships, among other variables, on divergence time estimation. We codify 37 fossil calibrations for Viridiplantae following best practice. We apply these calibrations in a Bayesian relaxed molecular clock analysis of a phylogenomic dataset encompassing the diversity of Embryophyta and their relatives within Viridiplantae. Topology and dataset sizes have little impact on age estimates, with greater differences among alternative clock models and calibration strategies. For all analyses, a Cambrian origin of Embryophyta is recovered with highest probability. The estimated ages for crown tracheophytes range from Late Ordovician to late Silurian. This timescale implies an early establishment of terrestrial ecosystems by land plants that is in close accord with recent estimates for the origin of terrestrial animal lineages. Biogeochemical models that are constrained by the fossil record of early land plants, or attempt to explain their impact, must consider the implications of a much earlier, middle Cambrian–Early Ordovician, origin.
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影响因子：
9.4
作者：
Clarke, John T.;Warnock, Rachel C. M.;Donoghue, Philip C. J.
通讯作者：
Donoghue, Philip C. J.
影响因子：
2.6
作者：
Edwards, Dianne;Cherns, Lesley;Raven, John A.
通讯作者：
Raven, John A.
影响因子：
3.4
作者：
Hedges, SB;Blair, JE;Shoe, JL
通讯作者：
Shoe, JL
影响因子：
1.9
作者：
Guo, Cai-Qing;Edwards, Dianne;Li, Cheng-Sen
通讯作者：
Li, Cheng-Sen
影响因子：
64.8
作者：
EDWARDS, D;FEEHAN, J
通讯作者：
FEEHAN, J