Tasmanian Institute for Agriculture, University of Tasmania, Hobart, TAS 7001, Australia.
Collaborative Innovation Centre for Grain Industry, College of Agriculture, Yangtze University, Jingzhou 434025, China; College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China.
Trends Plant Sci. 2020 May;25(5):434-445. doi: 10.1016/j.tplants.2019.12.012. Epub 2020 Jan 18.
Potassium regulates a plethora of metabolic and developmental response in plants, and upon exposure to biotic and abiotic stresses a substantial K loss occurs from plant cells. The outward-rectifying potassium efflux GORK channels are central to this stress-induced K loss from the cytosol. In the mammalian systems, signaling molecules such as gamma-aminobutyric acid, G-proteins, ATP, inositol, and protein phosphatases were shown to operate as ligands controlling many K efflux channels. Here we present the evidence that the same molecules may also regulate GORK channels in plants. This mechanism enables operation of the GORK channels as a master switch of the cell metabolism, thus adjusting intracellular K homeostasis to altered environmental conditions, to maximize plant adaptive potential.
钾在植物的多种代谢和发育反应中起调节作用，而在受到生物和非生物胁迫时，植物细胞会大量流失钾。外向整流钾外排通道 GORK 对于这种由细胞质引起的应激性钾流失至关重要。在哺乳动物系统中，信号分子如γ-氨基丁酸、G 蛋白、ATP、肌醇和蛋白磷酸酶被证明作为配体控制着许多钾外排通道。在这里，我们提出证据表明，同样的分子也可能调节植物中的 GORK 通道。这种机制使 GORK 通道能够作为细胞代谢的主开关运作，从而调节细胞内钾稳态以适应环境变化，最大限度地提高植物的适应潜力。
