ph-signaling
pH signaling refers to the cellular mechanisms by which plants detect and respond to changes in pH levels within their tissues, apoplast, and rhizosphere. In plant biology, pH acts as a critical secondary messenger influencing processes such as nutrient uptake, cell elongation, stomatal regulation, and responses to pathogens or environmental stress. Understanding pH signaling pathways helps researchers decode how plants integrate chemical cues to coordinate growth, defense, and adaptation to fluctuating soil and environmental conditions.
open_in_new WikipediaPubMed · 2026-04-21
Scientists discovered how plants sound a molecular alarm when attacked by pathogens or damaged: a chain of protein signals blocks an acid pump on cell surfaces, making the fluid around cells more alkaline. This pH shift acts as a key messenger that helps plants mount their immune response.
A phosphorelay signaling circuit (a chain of proteins passing chemical tags) drives extracellular alkalinization downstream of cell-surface immune receptors
The mechanism works by inhibiting autoinhibited H+-ATPase proton pumps, reducing acid secretion and raising extracellular pH
Extracellular alkalinization functions as an active signaling component in both pathogen-triggered immunity (PTI) and cell-wall damage responses, not merely a passive byproduct