An evidence-based 3D reconstruction of Asteroxylon mackiei, the most complex plant preserved from the Rhynie chert.
An evidence-based 3D reconstruction of Asteroxylon mackiei, the most complex plant preserved from the Rhynie chert.
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DOI：
10.7554/elife.69447
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发表时间：
2021-08-24
期刊：
影响因子：
7.7
通讯作者：
Dolan L
中科院分区：
文献类型：
--
作者：
Hetherington AJ;Bridson SL;Lee Jones A;Hass H;Kerp H;Dolan L
早泥盆世的Rhynie燧石保存了最早的陆地生态系统，并为我们了解早期陆地生命提供了信息。然而，我们对这些植物的3D结构和发展的了解仍然是初步的。在这里，我们使用数字三维重建技术，以产生第一个证据充分的重建的结构和发展的石松Asteroxylon mackiei，最复杂的植物在Rhynie燧石的生根系统。重建揭示了组织的三个不同的轴类型-叶枝轴，根轴承轴，生根轴-在身体计划。结合这一重建与发育数据，从再生分生组织，我们证明，A。mackiei根轴-无根祖先状态和真根之间的过渡性石松植物器官-通过各向异性二分法从根轴发育而来。我们的发现展示了这个独特的器官是如何发展的，并强调了基于证据的重建对于理解地球上第一个复杂维管植物的发展和进化的价值。
The Early Devonian Rhynie chert preserves the earliest terrestrial ecosystem and informs our understanding of early life on land. However, our knowledge of the 3D structure, and development of these plants is still rudimentary. Here we used digital 3D reconstruction techniques to produce the first well-evidenced reconstruction of the structure and development of the rooting system of the lycopsid Asteroxylon mackiei, the most complex plant in the Rhynie chert. The reconstruction reveals the organisation of the three distinct axis types – leafy shoot axes, root-bearing axes, and rooting axes – in the body plan. Combining this reconstruction with developmental data from fossilised meristems, we demonstrate that the A. mackiei rooting axis – a transitional lycophyte organ between the rootless ancestral state and true roots – developed from root-bearing axes by anisotomous dichotomy. Our discovery demonstrates how this unique organ developed and highlights the value of evidence-based reconstructions for understanding the development and evolution of the first complex vascular plants on Earth.