Chlorophyll Fluorescence Applications in Plant Stress Physiology

Chlorophyll fluorescence has emerged as a robust, non-invasive tool for probing the functional state of photosystem II (PSII) and monitoring plant responses to abiotic stress. When chlorophyll molecules absorb light, excess energy is either used for photochemistry, dissipated as heat or emitted as fluorescence; the relative partitioning of these pathways provides direct insight into photosynthetic efficiency, photoprotective mechanisms and damage from stressors such as drought, salinity, extreme temperatures and nutrient limitations. Key parameters—including the maximum quantum efficiency (Fv/Fm), the effective quantum yield of PSII (Y(II)) and non-photochemical quenching (NPQ)—quantify potential energy conversion, actual photochemical performance and heat dissipation, respectively. Advances in fluorescence imaging and kinetic measurement platforms have enabled high-throughput phenotyping, spatial mapping of stress heterogeneity at leaf and canopy scales, and early detection of sub-visible stress effects. Integration with spectral reflectance, multicolour imaging and machine-learning algorithms has further refined screening of tolerant genotypes, informed irrigation and nutrient management, and supported breeding programmes aimed at enhancing crop resilience under changing climates. These approaches are now central to precision agriculture, urban greening strategies and fundamental studies of stress physiology, offering a globally deployable suite of diagnostics to safeguard plant productivity.

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Chlorophyll Fluorescence Applications in Plant Stress Physiology publication trend

The graph below shows the total number of articles in chlorophyll fluorescence applications in plant stress physiology across all publications each year (not limited to Nature Index journals).

Technical terms

Fv/Fm: The maximum quantum efficiency of PSII photochemistry in dark-adapted samples, indicating potential photosynthetic capacity.

Y(II): The effective quantum yield of PSII under light-adapted conditions, reflecting actual photochemical energy conversion.

Non-Photochemical Quenching (NPQ): A photoprotective process by which excess excitation energy is dissipated as heat to prevent photodamage.

Photochemical Quenching (qP): The fraction of open PSII reaction centres, serving as an index of electron transport activity.

Chlorophyll Fluorescence Imaging: A non-invasive technique that spatially resolves fluorescence emissions to map photosynthetic performance across tissues.

References

1. Thriving under multiple stressors: Performance of drought-tolerant perennials and their suitability for infiltration swales. Urban Forestry & Urban Greening (2024).
2. Phenotyping of Arabidopsis Drought Stress Response Using Kinetic Chlorophyll Fluorescence and Multicolor Fluorescence Imaging. Frontiers in Plant Science (2018).
3. Effect of Drought Stress on Chlorophyll Fluorescence Parameters, Phytochemical Contents, and Antioxidant Activities in Lettuce Seedlings. Horticulturae (2021).
4. Effects of Water Stress on Fluorescence Parameters and Photosynthetic Characteristics of Drip Irrigation in Rice. Water (2020).
5. Quantifying spatial heterogeneity of chlorophyll fluorescence during plant growth and in response to water stress. Plant Methods (2015).