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Hydrogen peroxide contributes to the ultraviolet‐B (280–315 nm) induced oxidative stress of plant leaves through multiple pathways
Author(s) -
Czégény Gyula,
Wu Min,
Dér András,
Eriksson Leif A.,
Strid Åke,
Hideg Éva
Publication year - 2014
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2014.05.005
Subject(s) - hydrogen peroxide , oxidative stress , chemistry , photochemistry , antioxidant , radical , catalase , reactive oxygen species , biophysics , oxidative phosphorylation , biochemistry , biology
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.