Gámez-Arjona Francisco M, Sánchez-Rodríguez Clara, Montesinos Juan Carlos
Department of Biology, ETH Zurich, Zurich, Switzerland.
Front Plant Sci. 2022 Aug 23;13:931979. doi: 10.3389/fpls.2022.931979. eCollection 2022.
Plant nutrition, growth, and response to environmental stresses are pH-dependent processes that are regulated at the apoplastic and subcellular levels. The root apoplastic pH is especially sensitive to external cues and can also be modified by intracellular inputs, such as hormonal signaling. Optimal crosstalk of the mechanisms involved in the extent and span of the apoplast pH fluctuations promotes plant resilience to detrimental biotic and abiotic factors. The fact that variations in local pHs are a standard mechanism in different signaling pathways indicates that the pH itself can be the pivotal element to provide a physiological context to plant cell regions, allowing a proportional reaction to different situations. This review brings a collective vision of the causes that initiate root apoplastic pHs variations, their interaction, and how they influence root response outcomes.
植物营养、生长以及对环境胁迫的响应都是依赖于pH值的过程，这些过程在质外体和亚细胞水平受到调控。根质外体pH对外部信号特别敏感，也会受到细胞内输入信号（如激素信号）的影响而发生改变。参与质外体pH波动程度和范围的机制之间的最佳相互作用，可促进植物对有害生物和非生物因素的抵御能力。局部pH值变化是不同信号通路中的一种标准机制，这一事实表明pH值本身可能是为植物细胞区域提供生理背景的关键因素，从而使植物能够对不同情况做出相应反应。本文综述了引发根质外体pH值变化的原因、它们之间的相互作用，以及这些因素如何影响根系响应结果。
