Proton Pump Mechanisms in Stress-Tolerant Plants

Proton pumps are integral membrane proteins that generate electrochemical gradients by translocating protons (H⁺) across cellular membranes. In plants, two major classes of proton pumps—the plasma membrane H⁺‐ATPase and vacuolar H⁺‐pyrophosphatase—play pivotal roles in energising nutrient uptake, maintaining pH homeostasis and driving secondary transport processes. Under abiotic stress conditions such as nutrient limitation, salinity, drought and temperature extremes, modulation of proton‐pump activity enables plants to adjust ion balances, regulate osmotic potential and sustain metabolic fluxes. Stress‐tolerant genotypes often exhibit enhanced expression or activity of specific proton pumps, resulting in improved nutrient acquisition, vacuolar sequestration of toxic ions and stabilisation of cellular pH under challenging environmental conditions. Advances in molecular genetics have revealed interactions between H⁺‐pyrophosphatases and receptor‐like kinases, linking proton‐pump function to stress‐responsive signalling pathways. Structural studies have elucidated proton‐translocation mechanisms and substrate specificity, inspiring novel strategies for crop improvement. Deployment of proton pump–enhanced transgenic lines has demonstrated tangible gains in yield and resource use efficiency under field conditions, underscoring the agronomic potential of targeting these enzymes. Collectively, research on proton‐pump mechanisms provides a mechanistic framework for engineering climate‐resilient crops with superior nutrient‐use efficiency and stress tolerance.

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Proton Pump Mechanisms in Stress-Tolerant Plants publication trend

The graph below shows the total number of articles in proton pump mechanisms in stress-tolerant plants across all publications each year (not limited to Nature Index journals).

Technical terms

H⁺‐ATPase: An enzyme that uses ATP hydrolysis to pump protons across the plasma membrane, generating an electrochemical gradient.

H⁺‐pyrophosphatase (H⁺‐PPase): A vacuolar membrane enzyme that couples pyrophosphate hydrolysis to proton translocation into the vacuole.

Proton motive force: The electrochemical gradient of protons across a membrane, driving secondary active transport.

Tonoplast: The membrane surrounding the vacuole in plant cells, site of H⁺‐PPase and V‐ATPase activity.

Abiotic stress: Non‐living environmental factors such as salinity, drought or nutrient deficiency that adversely affect plant growth.

References

1. H+-pyrophosphatases enhance low nitrogen stress tolerance in transgenic Arabidopsis and wheat by interacting with a receptor-like protein kinase. Frontiers in Plant Science (2023).
2. Overexpression of VP, a vacuolar H+-pyrophosphatase gene in wheat (Triticum aestivum L.), improves tobacco plant growth under Pi and N deprivation, high salinity, and drought. Journal of Experimental Botany (2014).
3. High V‐PPase activity is beneficial under high salt loads, but detrimental without salinity. New Phytologist (2018).