Rapid depolarization and cytosolic calcium increase go hand-in-hand in mesophyll cells' ozone response
Please always quote using this URN: urn:nbn:de:bvb:20-opus-259646
- Plant stress signalling involves bursts of reactive oxygen species (ROS), which can be mimicked by the application of acute pulses of ozone. Such ozone-pulses inhibit photosynthesis and trigger stomatal closure in a few minutes, but the signalling that underlies these responses remains largely unknown. We measured changes in Arabidopsis thaliana gas exchange after treatment with acute pulses of ozone and set up a system for simultaneous measurement of membrane potential and cytosolic calcium with the fluorescent reporter R-GECO1. We show thatPlant stress signalling involves bursts of reactive oxygen species (ROS), which can be mimicked by the application of acute pulses of ozone. Such ozone-pulses inhibit photosynthesis and trigger stomatal closure in a few minutes, but the signalling that underlies these responses remains largely unknown. We measured changes in Arabidopsis thaliana gas exchange after treatment with acute pulses of ozone and set up a system for simultaneous measurement of membrane potential and cytosolic calcium with the fluorescent reporter R-GECO1. We show that within 1 min, prior to stomatal closure, O\(_{3}\) triggered a drop in whole-plant CO\(_{2}\) uptake. Within this early phase, O\(_{3}\) pulses (200–1000 ppb) elicited simultaneous membrane depolarization and cytosolic calcium increase, whereas these pulses had no long-term effect on either stomatal conductance or photosynthesis. In contrast, pulses of 5000 ppb O\(_{3}\) induced cell death, systemic Ca\(^{2+}\) signals and an irreversible drop in stomatal conductance and photosynthetic capacity. We conclude that mesophyll cells respond to ozone in a few seconds by distinct pattern of plasma membrane depolarizations accompanied by an increase in the cytosolic calcium ion (Ca\(^{2+}\)) level. These responses became systemic only at very high ozone concentrations. Thus, plants have rapid mechanism to sense and discriminate the strength of ozone signals.…
Author: | Maris Nuhkat, Mikael Brosché, Sonja Stoezle-Feix, Petra Dietrich, Rainer Hedrich, M. Rob G. RoelfsemaORCiD, Hannes Kollist |
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URN: | urn:nbn:de:bvb:20-opus-259646 |
Document Type: | Journal article |
Faculties: | Fakultät für Biologie / Julius-von-Sachs-Institut für Biowissenschaften |
Language: | English |
Parent Title (English): | New Phytologist |
Year of Completion: | 2021 |
Volume: | 232 |
Issue: | 4 |
Pagenumber: | 1692–1702 |
Source: | New Phytologist 2021, 232(4):1692–1702. DOI: 10.1111/nph.17711 |
DOI: | https://doi.org/10.1111/nph.17711 |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie |
Tag: | Arabidopsis thaliana; Ca\(^{2+}\) indicator; Ca\(^{2+}\) signalling; membrane depolarization; mesophyll; ozone; reactive oxygen species (ROS) |
Release Date: | 2022/04/06 |
Licence (German): | CC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International |