Cyanobacteria evolution: Insight from the fossil record.,Free Radical Biology and Medicine

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Cyanobacteria evolution: Insight from the fossil record.
Free Radical Biology and Medicine ( IF 7.1 ) Pub Date : 2019-05-09 , DOI: 10.1016/j.freeradbiomed.2019.05.007
Catherine F Demoulin ₁ , Yannick J Lara ₁ , Luc Cornet ₂ , Camille François ₁ , Denis Baurain ₃ , Annick Wilmotte ₄ , Emmanuelle J Javaux ₁

Affiliation

Cyanobacteria played an important role in the evolution of Early Earth and the biosphere. They are responsible for the oxygenation of the atmosphere and oceans since the Great Oxidation Event around 2.4 Ga, debatably earlier. They are also major primary producers in past and present oceans, and the ancestors of the chloroplast. Nevertheless, the identification of cyanobacteria in the early fossil record remains ambiguous because the morphological criteria commonly used are not always reliable for microfossil interpretation. Recently, new biosignatures specific to cyanobacteria were proposed. Here, we review the classic and new cyanobacterial biosignatures. We also assess the reliability of the previously described cyanobacteria fossil record and the challenges of molecular approaches on modern cyanobacteria. Finally, we suggest possible new calibration points for molecular clocks, and strategies to improve our understanding of the timing and pattern of the evolution of cyanobacteria and oxygenic photosynthesis.

中文翻译：

蓝藻进化：来自化石记录的见解。

蓝藻在早期地球和生物圈的演化中发挥了重要作用。自 2.4 Ga 左右（可能更早）的大氧化事件以来，它们负责大气和海洋的氧化。它们也是过去和现在海洋的主要初级生产者，也是叶绿体的祖先。然而，早期化石记录中蓝藻的识别仍然含糊不清，因为常用的形态标准对于微化石的解释并不总是可靠的。最近，提出了蓝细菌特有的新生物特征。在这里，我们回顾经典和新的蓝藻生物特征。我们还评估了先前描述的蓝藻化石记录的可靠性以及现代蓝藻分子方法的挑战。最后，我们提出了分子钟可能的新校准点，以及提高我们对蓝藻和含氧光合作用进化的时间和模式的理解的策略。

更新日期：2019-05-16

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