Heat Shock Protein Mechanisms in Plant Stress Responses

Plants exposed to elevated temperatures, drought, salinity or pathogen attack rapidly upregulate a class of molecular chaperones known as heat shock proteins (HSPs). These proteins are grouped by molecular weight into families (for example Hsp100, Hsp90, Hsp70 and small HSPs) and act to prevent aggregation of denatured proteins, assist the refolding of polypeptides and stabilise cellular structures under stress. The activation of heat shock factors (HSFs) triggers the coordinated expression of HSP genes, creating an integrated defence network that interfaces with reactive oxygen species (ROS) signalling and hormone pathways. Beyond immediate stress mitigation, HSPs contribute to enhanced thermotolerance, cross-protection against multiple stresses and the preservation of developmental programmes. In agricultural contexts, manipulation of HSP expression offers a promising route to improve crop resilience amid climate change.

Research from Nature Portfolio

No recent Nature Portfolio content available.

Heat Shock Protein Mechanisms in Plant Stress Responses publication trend

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

Technical terms

Heat shock proteins (HSPs): Stress‐induced molecular chaperones that prevent protein misfolding and aggregation, assisting in protein refolding and stabilisation.

Molecular chaperone: A protein that aids the folding, assembly or disassembly of other macromolecular structures without being part of the final structure.

Small heat shock proteins (sHSPs): A subclass of HSPs (typically 15–30 kDa) characterised by an α-crystallin domain, acting as holdases to maintain unfolded proteins in a refoldable state.

Heat shock factors (HSFs): Transcriptional regulators that bind heat shock elements (HSEs) in promoters to activate HSP gene expression in response to stress.

Reactive oxygen species (ROS): Chemically reactive molecules (such as hydrogen peroxide) generated under stress that function both as damaging agents and as signalling molecules for defence pathways.

Thermotolerance: The capacity of plants to survive and maintain physiological function at elevated temperatures, often conferred by accumulated HSPs.

References

1. Heat Shock Proteins: Dynamic Biomolecules to Counter Plant Biotic and Abiotic Stresses. International Journal of Molecular Sciences (2019).
2. Genome-Wide Identification and Expression Profiling of Tomato Hsp20 Gene Family in Response to Biotic and Abiotic Stresses. Frontiers in Plant Science (2016).
3. Genome-wide analysis and expression profiling under heat and drought treatments of HSP70 gene family in soybean (Glycine max L.). Frontiers in Plant Science (2015).