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Hypoxia-induced increase in GABA content is essential for restoration of membrane potential and preventing ROS-induced disturbance to ion homeostasis

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Plant Communications 2021年第3期2卷 105-116页

作者： Qi Wu Nana Su Xin Huang Jin Cui Lana Shabala Meixue Zhou Min Yu Sergey Shabala International Research Centre for Environmental Membrane Biology Foshan UniversityFoshan 528000China Tasmanian Institute for Agriculture College of Science and EngineeringUniversity of TasmaniaHobartTAS 7001Australia Institute of Crop Germplasm and Biotechnology Provincial Key Laboratory of AgrobiologyJiangsu Academy of Agricultural SciencesNanjing 210014China College of Life Sciences Nanjing Agricultural UniversityNanjing 210095China

When plants are exposed to hypoxic conditions,the level of g-aminobutyric acid(GABA)in plant tissues increases by several orders of *** physiological rationale behind this elevation remains largely *** combining genetic and electrophysiological approach,in this work we show that hypoxia-induced increase in GABA content is essential for restoration of membrane potential and preventing ROS-induced disturbance to cytosolic K+homeostasis and Ca^(2+)*** show that reduced O_(2) availability affects H+-ATPase pumping activity,leading to membrane depolarization and K+loss via outward-rectifying gork *** stress also results in H_(2)O_(2) accumulation in the cell that activates ROS-inducible Ca^(2+)uptake channels and triggers self-amplifying"ROS-Ca hub,"further exacerbating K^(+)loss via non-selective cation channels that results in the loss of the cell’s ***-induced elevation in the GABA level may restore membrane potential by pH-dependent regulation of H^(+)-ATPase and/or by generating more energy through the activation of the GABA shunt pathway and TCA *** GABA can also provide better control of the ROS-Ca^(2+)hub by transcriptional control of RBOH genes thus preventing over-excessive H_(2)O_(2) ***,GABA can operate as a ligand directly controlling the open probability and conductance of K+efflux gork channels,thus enabling plants adaptation to hypoxic conditions.

关键词： potassium homeostasis calcium signaling NADPH oxidase gork H+-ATPase reactive oxygen species

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