Evolution of osmosensing OSCA1 Ca2+ channel family coincident with plant transition from water to land
Evolution of osmosensing OSCA1 Ca2+ channel family coincident with plant transition from water to land
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DOI：
10.1002/tpg2.20198
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发表时间：
2022-05-03
期刊：
影响因子：
4.2
通讯作者：
Pei, Zhen-Ming
中科院分区：
文献类型：
--
作者：
Wu, Xiaomei;Yuan, Fang;Pei, Zhen-Ming
水对植物生长发育和环境适应至关重要。水分胁迫触发细胞质内Ca2+ ([Ca2+](i))增加，OSCA1 (reduced - hyperosmolal - induced -[Ca2+](i)- increase 1)， OSCA家族的成员，感知初始水分胁迫并控制其下游反应。OSCA同源物存在于真核生物中，并在高等植物中大量辐射。然而，OSCA家族是否对植物从水环境进化到陆地环境以及随后在陆地上的适应至关重要，这是一个谜。在此，我们对OSCA家族进行了首次系统发育和分子进化分析。该家族在原生生物的早期进化中起源和多样化，并建立了三个谱系(a)在植物中，(b)在真菌中，以及(c)在几个主要真核生物谱系的复杂分支中。绿藻群直接位于底端至1-3枝，与植物从水向陆地的过渡相一致。1-3枝具有不同的基因扩增模式，结合前人对osca的功能分析表明，它们可能在陆生植物枝的独立进化过程中进化出了不同的功能，以应对不同的机械应力。此外，还探讨了不同陆生植物世系的不同选择压力。早期陆生植物（苔藓和石松）的osca进化速度较慢，而种子植物的osca进化速度较快。总之，我们假设在幼嫩植物的祖先中，osca已经进化到能够感知水分胁迫，它们占据典型的叶片、典型的根和韧皮部组织，所有这些组织都需要渗透传感器来维持植物体内的水分平衡和食物传导。
Water is crucial to plant growth, development, and environmental adaptation. Water stress triggers cytosolic Ca2+ ([Ca2+](i)) increases, and the osmosensor OSCA1 (REDUCED-HYPEROSMOLALITY-INDUCED-[Ca2+](i)-INCREASE 1), a member of the OSCA family, perceives the initial water stress and governs its downstream responses. OSCA homologs exist in eukaryotes and largely radiate in higher plants. However, it is enigmatic whether the OSCA family is crucial for plant evolution from aqueous to terrestrial environments and for the subsequent adaptation on land. Here, we carried out the first phylogenetic and molecular evolutionary analyses of the OSCA family. The family originated and diversified during the early evolution of protists, and three more lineages were established (a) in plants, (b) in fungi, and (c) in a complex clade of several major eukaryotic lineages. The chlorophyte algal cluster is directly basal to streptophyte-specific Clades 1-3, consistent with plant transition from water to land. The Clades 1-3 present different gene expansion pattern and together with previous functional analysis of OSCAs reveal that they probably have evolved diverse functions in respond to various mechanical stresses during the independent evolution of land plant clades. Moreover, variable selection pressures on different land plant lineages were explored. OSCAs in early land plants (mosses and lycophytes) were under decelerated evolution, whereas OSCAs in seed plants showed accelerated evolution. Together, we hypothesize OSCAs have evolved to sense water stress in the ancestor of euphyllophytes, which occupies typical leaves, typical roots, and phloem tissues, all of which require osmosensors to maintain water balance and food conduction through plant bodies.