Abiotic Stress Responses in Crop Plants

Abiotic stresses such as drought, salinity, extreme temperatures and nutrient imbalances profoundly affect crop growth and yield. Plants perceive these adverse conditions at the cellular level, leading to the accumulation of reactive oxygen species and potential damage to proteins, lipids and DNA. To cope, crops deploy a suite of adaptive strategies. Morphological adjustments include reduced leaf area and deeper root systems to conserve water, while physiological responses encompass stomatal closure and altered transpiration. Biochemically, plants accumulate compatible solutes—known as osmoprotectants—and activate enzymatic and non-enzymatic antioxidant systems to neutralise harmful molecules. Stress signals are integrated through phytohormones, notably abscisic acid, which orchestrates gene expression and protein modification to enhance tolerance. Advances in genomics, transcriptomics and high-throughput phenotyping have identified key genes and regulatory networks that underpin stress resilience. Translational efforts now combine marker-assisted breeding, genome editing and novel biostimulants or beneficial microorganisms. By integrating laboratory discoveries with field validation, researchers aim to safeguard global food security under increasingly unpredictable climates and degraded soils.

Research from Nature Portfolio

Seaweed extracts from brown (Sargassum muticum) and red (Jania rubens) algae have been shown to enhance salt tolerance in chickpea by modulating amino acid metabolism and reinforcing antioxidant enzyme activities. Treatment with these extracts maintained growth under high salinity by increasing key osmoprotective amino acids—serine, threonine, proline and aspartic acid—in roots and shoots. Enhanced activities of superoxide dismutase and peroxidase contributed to reduced oxidative damage. Brown algal extract exhibited greater efficacy, highlighting the potential of marine biostimulants in stabilising crop performance in saline soils.

Abiotic Stress Responses in Crop Plants publication trend

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

Technical terms

Abiotic stress: Non-living environmental factors (drought, salinity, temperature extremes) that limit plant growth and yield.

Osmoprotectant: Small solutes (proline, glycine betaine) that help maintain cellular water balance and stabilise proteins and membranes under stress.

Reactive oxygen species (ROS): Highly reactive molecules (hydrogen peroxide, superoxide) generated by metabolic imbalance that can damage cellular structures.

Antioxidant defence system: Enzymatic (superoxide dismutase, catalase, peroxidase) and non-enzymatic (ascorbate, glutathione) components that scavenge ROS.

Phytohormones: Plant signalling molecules (abscisic acid, gibberellins) that regulate physiological and developmental processes, including stress responses.

References

1. Soil application of effective microorganisms and nitrogen alleviates salt stress in hot pepper (Capsicum annum L.) plants. Frontiers in Plant Science (2023).
2. Integrated Application of Selenium and Silicon Enhances Growth and Anatomical Structure, Antioxidant Defense System and Yield of Wheat Grown in Salt-Stressed Soil. Plants (2021).
3. Exogenous Gibberellic Acid or Dilute Bee Honey Boosts Drought Stress Tolerance in Vicia faba by Rebalancing Osmoprotectants, Antioxidants, Nutrients, and Phytohormones. Plants (2021).
4. Sargassum muticum and Jania rubens regulate amino acid metabolism to improve growth and alleviate salinity in chickpea. Scientific Reports (2017).