Advanced vascular function discovered in a widespread moss
Advanced vascular function discovered in a widespread moss
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DOI：
10.1038/s41477-020-0602-x
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发表时间：
2020-03-01
期刊：
影响因子：
18
通讯作者：
Holbrook, N. M.
中科院分区：
文献类型：
--
作者：
Brodribb, T. J.;Carriqui, M.;Holbrook, N. M.
能够向上生长进入干燥大气层的陆地植物的进化深刻地改变了地球。在泥盆纪时期，从小型的“非维管”brabrites到木本维管植物的过渡部分归因于内部维管系统的进化创新，该系统能够在与维管水运输相关的大量水张力下发挥作用。在这里，我们表明，血管功能在最广泛的生活brabrites（多毛菌commune）表现出强大的功能与高等植物的血管系统的相似之处。这些相似之处包括在多毛类植物中的维管导管，在张力下运输水时抵抗屈曲，以及能够调节蒸腾作用的叶子，允许光合气体交换而不会在维管系统内产生空化。在这个最高的苔藓植物家族中发现的先进的维管功能与其叶子中发现的极其低效的水分利用形成鲜明对比，强调了气孔进化的重要性，使光合作用能够在远高于土壤表面的地方进行。苔藓被认为是植物学中的非维管植物。在这里，作者已经表明，一种常见的苔藓物种含有维管样结构，与维管植物的导水组织具有生理相关性。
The evolution of terrestrial plants capable of growing upwards into the dry atmosphere profoundly transformed the Earth. A transition from small, 'non-vascular' bryophytes to arborescent vascular plants during the Devonian period is partially attributed to the evolutionary innovation of an internal vascular system capable of functioning under the substantial water tension associated with vascular water transport. Here, we show that vascular function in one of the most widespread living bryophytes (Polytrichum commune) exhibits strong functional parallels with the vascular systems of higher plants. These parallels include vascular conduits in Polytrichum that resist buckling while transporting water under tension, and leaves capable of regulating transpiration, permitting photosynthetic gas exchange without cavitation inside the vascular system. The advanced vascular function discovered in this tallest bryophyte family contrasts with the highly inefficient water use found in their leaves, emphasizing the importance of stomatal evolution enabling photosynthesis far above the soil surface.Mosses are considered non-vascular plants in botany. Here, the authors have shown that a common moss species contains vascular-like structures with physiological relevance to the water-conducting tissues of vascular plants.