Thermal imaging was used to study the early stage response to light-induced heating of Arabidopsis thaliana leaves. Time-series thermograms provided a spatial and temporal characterization of temperature changes in Arabidopsis wild type and the ost1-2 mutant rosettes exposed to excessive illumination. The initial response to high light, defined by the exponential increase in leaf temperature of ost1-2 gave an increased thermal time constant compared to wild type plants. The inability to regulate stomata in ost1-2 resulted in enhanced stomatal conductance and transpiration rate. Under strong irradiation, a significant decline in the efficiency of photosystem II was observed. This study evaluates infrared thermography kinetics and determines thermal time constants in particular, as an early and rapid method for diagnosing the prime indicators of light stress in plants under excessive light conditions.

Department of Botany Physiology and Plant Protection Faculty of Biotechnology and Horticulture University of Agriculture in Kraków Al 29 Listopada 54 31 425 Kraków Poland

Faculty of Physics and Applied Computer Science AGH University of Science and Technology Al A Mickiewicza 30 30 059 Kraków Poland

Malopolska Centre of Biotechnology Jagiellonian University Gronostajowa 7a 30 387 Kraków Poland

Photon Systems Instruments Drásov 470 664 24 Drásov Czech Republic

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