Strigolactones in Plant Stress Tolerance Mechanisms

Strigolactones are carotenoid-derived phytohormones that orchestrate plant growth and axillary shoot development while also modulating responses to environmental stress. Under drought, salinity, extreme temperatures and nutrient deficiency, strigolactones trigger a suite of physiological and molecular adaptations, including enhancement of photosynthetic performance, upregulation of antioxidant defence systems, maintenance of ion homeostasis and fine-tuning of hormonal crosstalk. Exogenous application of synthetic analogues such as GR24 or genetic manipulation of key signalling components has demonstrated marked improvements in seed germination, root architecture, stomatal regulation and reproductive yield across diverse crops. The global significance of strigolactone research lies in its potential to guide precision agro-technologies and breeding strategies for resilient agriculture in the face of climate change.

Research from Nature Portfolio

Recent studies have demonstrated that treatment of salt-stressed rice seedlings with a synthetic strigolactone analogue mitigates growth inhibition by restoring photosynthetic capacity and gas-exchange parameters. Exogenous GR24 application led to significant increases in chlorophyll content, plant height and root length under high salinity. Concurrently, levels of lipid peroxidation decreased while activities of antioxidant enzymes recovered, reflecting alleviation of oxidative damage. These findings confirm the potential of strigolactone-based treatments to enhance crop performance on saline soils.

Strigolactones in Plant Stress Tolerance Mechanisms publication trend

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

Technical terms

Strigolactones: Carotenoid-derived plant hormones that regulate development and stress responses.

GR24: Synthetic analogue of strigolactone used to study and manipulate signalling pathways.

D14 receptor: α/β-hydrolase protein that perceives strigolactones and initiates downstream signalling.

Reactive oxygen species (ROS): Highly reactive molecules such as superoxide and hydrogen peroxide that accumulate under stress and can cause cellular damage.

Antioxidant enzymes: Protective proteins (e.g. superoxide dismutase, peroxidase, catalase, ascorbate peroxidase) that scavenge ROS.

References

1. Strigolactone Alleviates the Adverse Effects of Salt Stress on Seed Germination in Cucumber by Enhancing Antioxidant Capacity. Antioxidants (2023).
2. The Overexpression of Zea mays Strigolactone Receptor Gene D14 Enhances Drought Resistance in Arabidopsis thaliana L.. International Journal of Molecular Sciences (2024).
3. The role of strigolactone in alleviating salinity stress in chili pepper. BMC Plant Biology (2024).
4. Effects of strigolactone on photosynthetic and physiological characteristics in salt-stressed rice seedlings. Scientific Reports (2020).