Heat Stress Tolerance Mechanisms in Turfgrass Systems

Heat stress represents a major constraint on the performance and persistence of turfgrass species, particularly in regions facing intensified summers and episodic heatwaves. Elevated temperatures impair photosynthetic efficiency, provoke the over-production of reactive oxygen species and destabilise cellular membranes, leading to accelerated senescence and turf decline. Turfgrasses have evolved an integrated suite of defences—morphological traits such as deep rooting and increased leaf thickness; physiological adjustments including osmotic solute accumulation and stomatal regulation; biochemical responses centred on antioxidant enzymes and heat shock proteins; and genetic adaptations uncovered through transcriptomic profiling and molecular markers. These mechanisms operate in concert to maintain water status, protect photosystem integrity and preserve turf quality. Insights into these processes underpin breeding, management and biotechnological strategies designed to bolster turf resilience under rising thermal stress.

Research from Nature Portfolio

Comparative transcriptomic analysis in creeping bentgrass has identified over 1 400 genes differentially regulated under heat stress alone and more than 1 600 under combined heat and drought, with a core set of nearly 700 genes common to both conditions. Up-regulation of proline biosynthesis and oxylipin pathways and down-regulation of thiamine metabolism and calcium-sensing receptors were among the shared responses. This convergence reveals molecular hubs that mediate generalised stress tolerance and offers candidate genes for targeted editing or marker-assisted selection to enhance thermotolerance in turfgrass species.

Heat Stress Tolerance Mechanisms in Turfgrass Systems publication trend

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

Technical terms

Heat shock proteins (HSPs): Molecular chaperones induced by elevated temperatures that prevent protein unfolding and aggregation.

Reactive oxygen species (ROS): Highly reactive molecules (e.g. superoxide, hydrogen peroxide) generated under stress that can damage lipids, proteins and nucleic acids.

Osmotic adjustment: Accumulation of compatible solutes (such as proline and soluble sugars) in cells to maintain turgor and water uptake during heat stress.

Chlorophyll fluorescence (OJIP): A rapid, non-invasive measurement of photosystem II activity that traces the O-J-I-P transient to diagnose photochemical and electron transport efficiency under stress.

Transcriptomic profiling: Genome-wide analysis of gene expression (commonly via RNA-seq) to identify differentially expressed genes under specific treatments or environmental conditions.

Photochemical efficiency (Fv/Fm): The ratio of variable to maximum chlorophyll fluorescence in dark-adapted samples, indicating the maximum quantum yield of photosystem II photochemistry.

References

1. Comparative transcriptomic analysis reveals common molecular factors responsive to heat and drought stress in Agrostis stolonifera. Scientific Reports (2018).
2. Metabolic regulation of 5-oxoproline for enhanced heat tolerance in perennial ryegrass. Stress Biology (2024).
3. Metabolic and Physiological Regulation of Aspartic Acid-Mediated Enhancement of Heat Stress Tolerance in Perennial Ryegrass. Plants (2022).
4. Assessing Heat Tolerance in Creeping Bentgrass Lines Based on Physiological Responses. Plants (2022).