Salinity Stress Responses in Plant Systems and Crop Plants

Soil salinisation poses a mounting threat to agricultural productivity worldwide, imposing osmotic and ionic challenges that disrupt water uptake, nutrient balance and cellular homeostasis. Plants perceive salinity through changes in cell turgour and ion concentrations, triggering cascades of signal transduction involving calcium fluxes, reactive oxygen species (ROS) and phytohormones such as abscisic acid. Adaptive responses span morphological adjustments—root architecture alteration, leaf succulence and stomatal regulation—to biochemical and molecular strategies. At the biochemical level, compatible solutes or osmolytes (for example proline and glycine betaine) accumulate to preserve cell hydration. Concurrently, antioxidant enzymes including superoxide dismutase, catalase and ascorbate peroxidase mitigate oxidative damage by scavenging ROS. At the cellular interface, specialised ion transporters and antiporters (such as Na+/H+ exchangers and high-affinity K+ channels) restrict sodium influx into the cytoplasm or compartmentalise it into vacuoles, thereby maintaining a favourable K+/Na+ ratio. Molecularly, transcription factors belonging to NAC, DREB and MYB families orchestrate the expression of stress-responsive genes. Integration of these multiscale mechanisms underpins the development of salt-tolerant phenotypes, with practical applications in conventional breeding, genome editing and the use of biostimulants for crop improvement.

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Salinity Stress Responses in Plant Systems and Crop Plants publication trend

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

Technical terms

Osmotic stress: Water deficit in plant cells caused by high external solute concentrations.

Ion toxicity: Cellular damage resulting from excessive uptake of sodium and chloride ions.

Osmolytes: Small organic molecules that balance cellular osmotic pressure and protect macromolecules.

Reactive oxygen species (ROS): Highly reactive oxygen derivatives that can cause oxidative damage.

Antioxidant enzymes: Proteins such as superoxide dismutase and catalase that neutralise ROS.

Malondialdehyde (MDA): A by-product of lipid peroxidation used as a marker of oxidative stress.

Salt Overly Sensitive (SOS) pathway: A signalling cascade regulating ion homeostasis under salt stress.

References

1. Mechanism of Salinity Tolerance in Plants: Physiological, Biochemical, and Molecular Characterization. International Journal of Genomics (2014).
2. Species selection as a key factor in the afforestation of coastal salt-affected lands: Insights from pot and field experiments. Journal of Environmental Management (2024).
3. Adaptation of basil to salt stress: Molecular mechanism and physiological regulation. Plant Stress (2024).
4. An Overview of Plant Phenolics and Their Involvement in Abiotic Stress Tolerance. Stresses (2023).