Drought Stress Effects on Plant Physiology

Drought stress represents a principal constraint on plant growth and crop productivity worldwide, undermining food security and ecosystem stability. Water deficit triggers an integrated cascade of physiological responses, beginning with stomatal closure to reduce transpirational water loss and leading to progressive inhibition of photosynthetic carbon assimilation. As internal CO₂ concentrations fall, the balance between light harvesting and carbon fixation shifts, generating reactive oxygen species that threaten cellular integrity unless neutralised by antioxidant defences. Concurrently, plants adjust osmotically by accumulating compatible solutes to maintain cell turgor and by remodelling root architecture to explore deeper soil moisture. Hormonal signals, particularly abscisic acid synthesised in roots, orchestrate these adjustments, coordinating guard cell behaviour, gene expression and resource allocation. Over the longer term, structural changes such as leaf rolling, altered membrane composition and enhanced root-to-shoot ratios contribute to tolerance. Understanding these multiscale responses is essential for breeding resilient varieties and devising agronomic strategies—ranging from precision irrigation to nutrient management—that mitigate the impacts of increasingly frequent and severe drought events under climate change.

Research from Nature Portfolio

Recent studies have illuminated the role of targeted nutrient interventions in bolstering physiological resilience to soil water deficit. In one investigation on a broad-leaved tree species, phosphorus fertilisation was shown to restore leaf water content and photosynthetic rate under drought by enhancing activities of superoxide dismutase, catalase and peroxidase, and by promoting accumulation of proline and soluble sugars. This biochemical adjustment reduced lipid peroxidation and sustained chlorophyll levels, demonstrating that mineral nutrition can shift the balance from stress damage towards metabolic stability. In parallel work with Moso bamboo, combinations of nitrogen and phosphorus supply mitigated drought-induced declines in net photosynthesis and stomatal conductance, while preserving membrane integrity and water-use efficiency. These findings converge to highlight the potential of nutrient management as a practical silvicultural measure to reinforce plant performance in water-limited environments.

Drought Stress Effects on Plant Physiology publication trend

The graph below shows the total number of articles in drought stress effects on plant physiology across all publications each year (not limited to Nature Index journals).

Technical terms

Stomatal conductance: Rate at which carbon dioxide enters and water vapour exits the leaf through stomatal pores.

Photosystem II: Protein complex in chloroplast thylakoid membranes responsible for water splitting and oxygen evolution in the light reactions.

Reactive oxygen species: Highly reactive molecules formed under stress that can damage lipids, proteins and nucleic acids.

Osmolyte: Small organic compound (e.g. proline, soluble sugar) that accumulates to maintain cell turgor under drought.

Non-photochemical quenching: Protective mechanism that dissipates excess absorbed light energy as heat to prevent photo-oxidative damage.

Abscisic acid (ABA): Plant hormone that mediates stomatal closure, gene expression and osmotic adjustment during water deficit.

References

1. The persistent impact of drought stress on the resilience of summer maize. Frontiers in Plant Science (2023).
2. Phosphorous fertilization alleviates drought effects on Alnus cremastogyne by regulating its antioxidant and osmotic potential. Scientific Reports (2018).
3. Alleviation of drought stress in Phyllostachys edulis by N and P application. Scientific Reports (2018).
4. Impacts of Drought on Photosynthesis in Major Food Crops and the Related Mechanisms of Plant Responses to Drought. Plants (2024).