Acute Exposure to UV-B Sensitizes Cucumber, Tomato, and Arabidopsis Plants to Photooxidative Stress by Inhibiting Thermal Energy Dissipation and Antioxidant Defense
Open Access
- 1 January 2011
- journal article
- Published by Oxford University Press (OUP) in Journal of Radiation Research
- Vol. 52 (2), 238-248
- https://doi.org/10.1269/jrr.10133
Abstract
To characterize a change in NPQ upon exposure to ultraviolet-B (UV-B), the xanthophyll cycle-dependent and -independent NPQs were compared in Cucumis sativus, Lycopersicum esculentum, and Arabidopsis thaliana leaves. The xanthophyll cycle-dependent NPQ was dramatically but reversibly suppressed by UV-B radiation. This suppression was correlated more strongly with a marked decrease in photosynthetic electron transport rather than changes in xanthophyll cycle enzymes such as violaxanthin de-epoxidase and zeaxanthin epoxidase. Accordingly, the UV-B-induced suppression of NPQ cannot be attributed to changes in expressions of VDE and ZEP. However, suppression of the xanthophyll cycle-dependent NPQ could only account for the 77 K fluorescence emission spectra of thylakoid membranes and the increased level of 1O2 production, but not for the decreased levels of •O2– production and H2O2 scavenging. These results suggest that a gradual reduction of H2O2 scavenging activity as well as a transient and reversible suppression of thermal energy dissipation may contribute differentially to increased photooxidative damages in cucumber, tomato, and Arabidopsis plants after acute exposure to UV-B radiation.Keywords
This publication has 35 references indexed in Scilit:
- The synthesis of NPQ-effective zeaxanthin depends on the presence of a transmembrane proton gradient and a slightly basic stromal side of the thylakoid membranePlanta, 2008
- Photosynthetic acclimation: Does the dynamic structure and macro‐organisation of photosystem II in higher plant grana membranes regulate light harvesting states?The FEBS Journal, 2008
- Control of the light harvesting function of chloroplast membranes: The LHCII‐aggregation model for non‐photochemical quenchingFEBS Letters, 2005
- Health effects from stratospheric ozone depletion and interactions with climate changePhotochemical & Photobiological Sciences, 2003
- Changes in biologically active ultraviolet radiation reaching the Earth’s surfacePhotochemical & Photobiological Sciences, 2003
- Growth under UV-B radiation increases tolerance to high-light stress in pea and bean plantsPublished by Springer Science and Business Media LLC ,2001
- Effects of Solar Ultraviolet Radiation on the Potential Efficiency of Photosystem II in Leaves of Tropical PlantsPlant Physiology, 1999
- Arabidopsis Mutants Define a Central Role for the Xanthophyll Cycle in the Regulation of Photosynthetic Energy ConversionPlant Cell, 1998
- REGULATION OF LIGHT HARVESTING IN GREEN PLANTSAnnual Review of Plant Physiology and Plant Molecular Biology, 1996
- New trends in photobiologyJournal of Photochemistry and Photobiology B: Biology, 1989