Thermal Stress Response Mechanisms in Plants

Plants encounter periods of elevated temperature that challenge cellular homeostasis and threaten growth and productivity. To survive, they deploy a multilayered response that begins with biophysical sensing of heat and culminates in widespread transcriptional and post-translational adjustments. Thermotolerance comprises both basal mechanisms active at the onset of heat stress and acquired strategies that prime plants for future episodes. Central to these processes are heat shock transcription factors (HSFs) that detect misfolded proteins or changes in membrane fluidity and trigger expression of heat shock proteins (HSPs), molecular chaperones that stabilise and refold denatured polypeptides. Alongside protein quality control, plants remodel chromatin and employ epigenetic marks—such as histone modifications and non-coding RNAs—to establish transcriptional memory, ensuring a faster and stronger response upon recurrent stress. Additional signalling pathways, including mitogen-activated protein kinase cascades and redox networks, integrate with HSF–HSP modules to fine-tune antioxidant defences and maintain reactive oxygen species at signalling levels. At the physiological level, thermal stress elicits adjustments in membrane composition, stomatal conductance and photosynthetic machinery, safeguarding energy metabolism. Collectively, these interlinked mechanisms confer resilience across developmental stages and environmental contexts, offering targets for breeding and biotechnological interventions to improve crop performance under a warming climate.

Research from Nature Portfolio

Recent studies have uncovered the long-sought molecular thermosensor in Arabidopsis, demonstrating that an intrinsically disordered co-regulator undergoes temperature-dependent conformational changes to initiate heat shock signalling. At elevated temperatures, this protein shifts structure to engage with repressor complexes and directly controls the activation of key HSFs and downstream HSP genes. By revealing how temperature is translated into a transcriptional response, this work provides a molecular switch that determines basal and acquired thermotolerance thresholds. Understanding the precise amino-terminal region responsible for thermosensing opens avenues for engineering crop varieties with adjustable heat response profiles by modulating sensor sensitivity and downstream gene expression.

Thermal Stress Response Mechanisms in Plants publication trend

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

Technical terms

Thermotolerance: The capacity of a plant to survive and function under high temperature conditions, encompassing both immediate and acclimated responses.

Heat shock transcription factors (HSFs): A family of sequence-specific DNA-binding proteins that sense stress and orchestrate expression of heat shock protein genes.

Heat shock proteins (HSPs): Molecular chaperones induced by HSFs that stabilise, refold or target damaged proteins for degradation under thermal stress.

Transcriptional memory: A chromatin-based phenomenon allowing genes previously activated by stress to be re-induced more rapidly and robustly upon subsequent exposures.

Epigenetic modifications: Heritable changes in gene expression potential, such as histone methylation or acetylation, that do not alter DNA sequence but influence chromatin accessibility.

References

1. The temperature sensor TWA1 is required for thermotolerance in Arabidopsis. Nature (2024).
2. Genomic and epigenomic determinants of heat stress-induced transcriptional memory in Arabidopsis. Genome Biology (2023).
3. The Mediator kinase module enhances polymerase activity to regulate transcriptional memory after heat stress in Arabidopsis. The EMBO Journal (2024).