Genomes of Subaerial Zygnematophyceae Provide Insights into Land Plant Evolution
Genomes of Subaerial Zygnematophyceae Provide Insights into Land Plant Evolution
复制标题
陆生双藻纲基因组为陆地植物进化提供见解
DOI：
10.1016/j.cell.2019.10.019
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发表时间：
2019-11-14
期刊：
影响因子：
64.5
通讯作者：
Melkonian, Michael
中科院分区：
文献类型：
--
作者：
Cheng, Shifeng;Xian, Wenfei;Melkonian, Michael
向陆地环境的过渡，被称为陆地化，通常被认为是陆地植物植物群进化和多样化的关键事件，改变了我们星球的表面。通过基因组学研究，一组链霉菌藻类，接合藻纲，最近被认为是陆地植物（胚胎植物）的可能姐妹群。在这里，我们报告的基因组序列和分析的两个早期分歧Zygnematophyceae（Spirogloea muscicola gen. nov.和Mesotaenium endlicherianum），共享相同的陆上/陆地栖息地与最早的分歧胚胎植物，brabentes。我们提供的证据表明，基因（即，GRAS和PYR/PYURCAR），它们起源或扩展于双星藻科和胚性植物的共同祖先，并通过水平基因转移（HGT）从土壤细菌中获得。这两个双星藻基因组代表了未来研究的基石，以了解潜在的分子机制和植物陆生化的过程。
The transition to a terrestrial environment, termed terrestrialization, is generally regarded as a pivotal event in the evolution and diversification of the land plant flora that changed the surface of our planet. Through phylogenomic studies, a group of streptophyte algae, the Zygnematophyceae, have recently been recognized as the likely sister group to land plants (embryophytes). Here, we report genome sequences and analyses of two early diverging Zygnematophyceae (Spirogloea muscicola gen. nov. and Mesotaenium endlicherianum) that share the same subaerial/terrestrial habitat with the earliest-diverging embryophytes, the bryophytes. We provide evidence that genes (i.e., GRAS and PYR/PYURCAR) that increase resistance to biotic and abiotic stresses in land plants, in particular desiccation, originated or expanded in the common ancestor of Zygnematophyceae and embryophytes, and were gained by horizontal gene transfer (HGT) from soil bacteria. These two Zygnematophyceae genomes represent a cornerstone for future studies to understand the underlying molecular mechanism and process of plant terrestrialization.