Going beyond nutrition: Regulation of potassium homoeostasis as a common denominator of plant adaptive responses to environment
Going beyond nutrition: Regulation of potassium homoeostasis as a common denominator of plant adaptive responses to environment
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DOI：
10.1016/j.jplph.2014.01.009
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发表时间：
2014-05-15
影响因子：
4.3
通讯作者：
Shabala, Sergey
中科院分区：
文献类型：
--
作者：
Anschutz, Uta;Becker, Dirk;Shabala, Sergey
在低等和高等植物中部分和完全完成的植物基因组测序项目使人们能够全面了解植物钾转运蛋白基因及其编码蛋白的分子和结构多样性。虽然这一领域早期的研究重点集中在结构-功能研究和K+转运的分子机制方面，但拟南芥突变体的可获得性与微阵列技术相结合，极大地促进了我们对K+通道生理学的理解，为植物体内钾稳态的转录调控提供了新的见解。最近，钾转运系统的翻译后调控已进入钾转运研究的中心阶段。目前的审查集中在这一领域最令人兴奋的发展。通过总结钾转运蛋白调控的最新工作，我们发现钾离子转运，特别是钾通道，是植物生命周期不同发育阶段细胞反应的重要靶标和介体。我们发现，细胞内K+稳态的调节对于植物对包括干旱、盐分和氧化胁迫在内的广泛的非生物和生物胁迫的适应性反应是至关重要的。我们进一步将K+通道的翻译后调节与细胞程序性死亡联系起来，并表明K+在控制后者的过程中起着关键作用。由此可见，K+不仅是维持植物最佳生长和产量所必需的营养物质，而且是一种重要的信号转导因子，调节植物对环境的广泛适应性反应。(C)2014年爱思唯尔股份有限公司。版权所有。
Partially and fully completed plant genome sequencing projects in both lower and higher plants allow drawing a comprehensive picture of the molecular and structural diversities of plant potassium transporter genes and their encoded proteins. While the early focus of the research in this field was aimed on the structure-function studies and understanding of the molecular mechanisms underlying K+ transport, availability of Arabidopsis thaliana mutant collections in combination with micro-array techniques have significantly advanced our understanding of K+ channel physiology, providing novel insights into the transcriptional regulation of potassium homeostasis in plants. More recently, post-translational regulation of potassium transport systems has moved into the center stage of potassium transport research. The current review is focused on the most exciting developments in this field. By summarizing recent work on potassium transporter regulation we show that potassium transport in general, and potassium channels in particular, represent important targets and are mediators of the cellular responses during different developmental stages in a plant's life cycle. We show that regulation of intracellular K+ homeostasis is essential to mediate plant adaptive responses to a broad range of abiotic and biotic stresses including drought, salinity, and oxidative stress. We further link post-translational regulation of K+ channels with programmed cell death and show that K+ plays a critical role in controlling the latter process. Thus, is appears that K+ is not just the essential nutrient required to support optimal plant growth and yield but is also an important signaling agent mediating a wide range of plant adaptive responses to environment. (C) 2014 Elsevier GmbH. All rights reserved.