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The air pollutant ozone can be used as a tool to unravel in planta processes induced by reactive oxygen species (ROS). Here, we have utilized ozone to study ROS‐dependent stomatal signaling. We show that the ozone‐triggered rapid transient decrease (RTD) in stomatal conductance coincided with a burst of ROS in guard cells. RTD was present in 11 different Arabidopsis ecotypes, suggesting that it is...
. To evaluate reactive absorption of ozone (O3) in the leaf apoplast, amphistomatous leaves of Phaseolus vulgaris L. were allowed to take up O3 through the stomata on the lower leaf surface at high rates for 3–5 min. Up to 5% of the O3 taken up diffused through the leaf and emerged from the stomata on the upper surface, suggesting above-zero O3 concentrations in the leaf intercellular air space,...
Abstract. To evaluate reactive absorption of ozone (O3) in the leaf apoplast, amphistomatous leaves of Phaseolus vulgaris L. were allowed to take up O3 through the stomata on the lower leaf surface at high rates for 35min. Up to 5% of the O3 taken up diffused through the leaf and emerged from the stomata on the upper surface, suggesting above-zero O3 concentrations in the leaf intercellular air space,...
Morning, midday and afternoon values of stomatal conductance and apoplastic and whole-leaf ascorbate concentrations in leaves of barley and wheat were measured on the 7 th day of exposure of young seedlings to ozone enriched air (75–100 nL/L, 8 h d -1 ) in open-top chambers. The aim of the study was to explore whether the contributions of these factors to the limitation of ozone flux...
Abstract. To assess protection of the mesophyll cell plasmalemma against O3 by apoplasmic reduced ascorbate (AA), its concentration in the leaf cell wall of common bean (Phaseolus vulgaris L.) was lowered from 0.6mM to 0.1mM by pre-exposing plants to continuous darkness for up to 48h. Subsequent ozonization of ascorbate-deficient leaves with 350450nmol O3mol1 resulted in a rapid rise of apoplasmic...
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