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Direct Observation and Automated Measurement of Stomatal Responses to Pseudomonas syringae pv. tomato DC3000 in Arabidopsis thaliana
Published on: February 9, 2024
Rapid stomatal closure triggered by a short ozone pulse is followed by reopening to overshooting values
Heino Moldau1, Triin Vahisalu, Hannes Kollist
1Institute of Technology, University of Tartu, Tartu, Estonia.
Abstract:
Stomatal pores, surrounded by the pairs of guard cells, regulate plant gas exchange. Correct stomatal regulation is crucial for plant survival under various stress conditions. We have recently utilized the air pollutant ozone (O₃) to study stomatal signaling and showed that application of O₃ induces rapid decrease in stomatal conductance. Here we have addressed the recovery of stomatal conductance and show that after exposures of plants to high O₃ pulses stomatal conductance recovered faster, reaching higher, "overshooting" values than were the pre-exposure values. We propose the hypothetical mechanism for this phenomenon and discuss it in the frames of current stomatal signaling models.
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