title: Rapid stomatal closure triggered by a short ozone pulse is followed by reopening to overshooting values.
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.
authors.affiliation: Institute of Technology, University of Tartu, Tartu, Estonia.
authors.forename: Heino
authors.initials: H
authors.lastname: Moldau
authors.forename: Triin
authors.initials: T
authors.lastname: Vahisalu
authors.forename: Hannes
authors.initials: H
authors.lastname: Kollist
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D017360:Arabidopsis / Q000502:physiology*; D010126:Ozone / Q000032:analysis*; D054046:Plant Stomata / Q000502:physiology*
chemical_list: D000393:Air Pollutants; D010126:Ozone