Oxidative Stress Responses in Plant Systems

Plants encounter oxidative stress when environmental challenges—such as drought, salinity, temperature extremes and agrochemicals—trigger an overproduction of reactive oxygen species. These highly reactive molecules, including superoxide anion and hydrogen peroxide, can damage proteins, lipids and nucleic acids. To maintain cellular homeostasis, plants have evolved a sophisticated antioxidant defence network comprising enzymatic scavengers (for example superoxide dismutase and catalase) and non-enzymatic metabolites such as ascorbate, glutathione and phenolic compounds. The dynamic balance between ROS generation and detoxification underpins redox signalling pathways that regulate gene expression, development and acclimation to stress. Central secondary metabolic routes—most notably the phenylpropanoid pathway—yield flavonoids and other phenolics that limit oxidative damage and modulate plant–environment interactions. Hormonal regulators, including brassinosteroids and jasmonates, further fine-tune antioxidant capacity and the expression of detoxification genes. At the whole-plant scale, oxidative stress responses influence photosynthetic efficiency, nutrient uptake and yield stability. A deep understanding of these interlinked mechanisms is essential for breeding resilient crop varieties and devising sustainable management strategies to mitigate the impacts of climate change and environmental pollutants.

Research from Nature Portfolio

Recent studies have revealed that exogenous application of certain herbicides and growth regulators can paradoxically enhance stress tolerance by modulating antioxidant defences. In salt-stressed rice cultivars, treatment with 2,4-dichlorophenoxyacetic acid alleviated ROS accumulation and membrane damage by promoting lignin and callose deposition, restoring the redox state of ascorbate and glutathione pools, and differentially regulating Na⁺ and K⁺ transporters in root tissues. In a separate investigation, silicon supplementation mitigated butachlor-induced oxidative stress in rice seedlings by enhancing photosynthetic energy flux, upregulating silicon channel and transporter genes, and bolstering the activities of ascorbate–glutathione cycle enzymes. Both lines of research highlight the capacity of targeted agronomic inputs to recalibrate redox homeostasis and reinforce antioxidant networks in crop plants facing salinity and chemical stress.

Oxidative Stress Responses in Plant Systems publication trend

The graph below shows the total number of articles in oxidative stress responses in plant systems across all publications each year (not limited to Nature Index journals).

Technical terms

Reactive oxygen species (ROS): Highly reactive molecules derived from oxygen metabolism, including superoxide and hydrogen peroxide, that can damage cellular components but also act as signalling agents.

Antioxidant enzymes: Proteins such as superoxide dismutase and catalase that catalyse the conversion of ROS to less reactive forms, thereby protecting cellular structures.

Ascorbate–glutathione cycle: A key redox circuit involving ascorbate and glutathione that cooperatively detoxifies hydrogen peroxide and regenerates antioxidant capacity.

Phenylpropanoid pathway: A metabolic route that generates phenolic compounds and flavonoids, which contribute to ROS scavenging, UV protection and structural support in plants.

Cation transporters: Membrane-embedded proteins that regulate the uptake and distribution of ions such as sodium and potassium, influencing osmotic balance and stress responses.

References

1. Response of Phenylpropanoid Pathway and the Role of Polyphenols in Plants under Abiotic Stress. Molecules (2019).
2. 2,4-D attenuates salinity-induced toxicity by mediating anatomical changes, antioxidant capacity and cation transporters in the roots of rice cultivars. Scientific Reports (2017).
3. Silicon tackles butachlor toxicity in rice seedlings by regulating anatomical characteristics, ascorbate-glutathione cycle, proline metabolism and levels of nutrients. Scientific Reports (2020).
4. Ursolic Acid Limits Salt-Induced Oxidative Damage by Interfering With Nitric Oxide Production and Oxidative Defense Machinery in Rice. Frontiers in Plant Science (2020).
5. Evaluation of titanium and silicon role in mitigation of fungicides toxicity in wheat expressed at the level of biochemical and antioxidant profile. Chemosphere (2022).