Oxidative Stress Responses and Plant Growth Mechanisms

Plants continuously generate reactive oxygen species (ROS) as by-products of photosynthesis and respiration. Under controlled conditions, ROS function as signalling molecules that regulate gene expression, hormone crosstalk and developmental programmes. However, environmental challenges such as drought, salinity or pathogen attack can overwhelm cellular antioxidant defences and provoke oxidative stress. To counteract ROS accumulation, plants employ an array of enzymatic antioxidants—including superoxide dismutase, catalase and peroxidases—and non-enzymatic scavengers such as ascorbate and glutathione. This antioxidant network interfaces with hormonal pathways (notably auxin and abscisic acid), redox-sensitive transcription factors and programmed cell death circuits to modulate cell division, expansion and differentiation. At the tissue level, fine-tuning of ROS homeostasis influences root meristem activity, vascular development and stomatal function, thereby shaping overall plant growth and resilience. Advances in molecular genetics have elucidated key components—such as NADPH oxidases, MAP kinase cascades and WRKY-type regulators—that integrate oxidative cues with developmental signals. Understanding these mechanisms is crucial for improving crop performance under stress and for the rational design of agrochemicals that exploit redox vulnerabilities in unwanted species.

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Oxidative Stress Responses and Plant Growth Mechanisms publication trend

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

Technical terms

Reactive oxygen species (ROS): Highly reactive oxygen-containing molecules, including superoxide and hydrogen peroxide, produced during metabolic and stress-related processes.

Antioxidant enzymes: Proteins such as superoxide dismutase and catalase that catalyse the conversion of ROS to less reactive forms, safeguarding cells from oxidative damage.

Lipid peroxidation: Oxidative degradation of membrane lipids that generates reactive aldehydes (e.g. malondialdehyde) and compromises membrane integrity.

Auxin: A key plant hormone involved in cell elongation, division and differentiation, central to root and shoot patterning.

Programmed cell death (PCD): A regulated cellular suicide process that removes damaged or unneeded cells, often activated by developmental cues or excessive oxidative stress.

References

1. Trans-cinnamaldehyde-related overproduction of benzoic acid and oxidative stress on Arabidopsis thaliana. Frontiers in Plant Science (2023).
2. Phytotoxicity, Morphological, and Metabolic Effects of the Sesquiterpenoid Nerolidol on Arabidopsis thaliana Seedling Roots. Plants (2020).
3. Short-Term Effects of Trans-Cinnamic Acid on the Metabolism of Zea mays L. Roots. Plants (2023).