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Hydrogen peroxide contributes to the ultraviolet-B (280-315 nm) induced oxidative stress of plant leaves through multiple pathways

Journal article
Authors G. Czegeny
Min Wu
A. Der
Leif A Eriksson
A. Strid
E. Hideg
Published in Febs Letters
Volume 588
Issue 14
Pages 2255-2261
ISSN 0014-5793
Publication year 2014
Published at Department of Chemistry and Molecular Biology
Pages 2255-2261
Language en
Keywords Arabidopsis, Computer modeling, Hydrogen peroxide, Hydroxyl radical, Leaf, Oxygen radicals, Plant, ELECTRON-SPIN RESONANCE, UV-B, REACTIVE OXYGEN, THYLAKOID MEMBRANES, PHOTOSYSTEM-II, RADIATION, PHOTOLYSIS, RADICALS, PHOTOSYNTHESIS, CHLOROPLASTS, Biochemistry & Molecular Biology, Biophysics, Cell Biology
Subject categories Cell Biology, Biochemistry and Molecular Biology, Biophysics


Solar UV-B (280-315 nm) radiation is a developmental signal in plants but may also cause oxidative stress when combined with other environmental factors. Using computer modeling and in solution experiments we show that UV-B is capable of photosensitizing hydroxyl radical production from hydrogen peroxide. We present evidence that the oxidative effect of UV-B in leaves is at least twofold: (i) it increases cellular hydrogen peroxide concentrations, to a larger extent in pyridoxine antioxidant mutant pdx1.3-1 Arabidopsis and; (ii) is capable of a partial photo-conversion of both 'natural' and 'extra' hydrogen peroxide to hydroxyl radicals. As stress conditions other than UV can increase cellular hydrogen peroxide levels, synergistic deleterious effects of various stresses may be expected already under ambient solar UV-B. (C) 2014 Federation of European Biochemical Societies. Published by Elsevier B.V. All rights reserved.

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