A non-destructive thermal imaging method was used to study the stomatal response of salt-treated Arabidopsis thaliana plants to excessive light. The plants were exposed to different levels of salt concentrations (0, 75, 150, and 220 mM NaCl). Time-dependent thermograms showed the changes in the temperature distribution over the lamina and provided new insights into the acute light-induced temporary response of Arabidopsis under short-term salinity. The initial response of plants, which was associated with stomatal aperture, revealed an exponential growth in temperature kinetics. Using a single-exponential function, we estimated the time constants of thermal courses of plants exposed to acute high light. The saline-induced impairment in stomatal movement caused the reduced stomatal conductance and transpiration rate. Limited transpiration of NaCl-treated plants resulted in an increased rosette temperature and decreased thermal time constants as compared to the controls. The net CO2 assimilation rate decreased for plants exposed to 220 mM NaCl; in the case of 75 mM NaCl treatment, an increase was observed. A significant decline in the maximal quantum yield of photosystem II under excessive light was noticeable for the control and NaCl-treated plants. This study provides evidence that thermal imaging as a highly sensitive technique may be useful for analyzing the stomatal aperture and movement under dynamic environmental 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

Department of Hydrogeology and Engineering Geology Faculty of Geology Geophysics and Environmental Protection AGH University of Science and Technology Al Mickiewicza 30 30 059 Kraków Poland

Faculty of Physics and Applied Computer Science AGH University of Science and Technology Al 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

The F Górski Institute of Plant Physiology Polish Academy of Sciences Niezapominajek 21 30 239 Kraków Poland

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