Publication
Title
Effect of elevated and temperature on the oxidative stress response to drought in **Lolium perenne** L. and **Medicago sativa** L.
Author
Abstract
Studies addressing the combined impact of multiple climate factors on plant abiotic stress responses are still scarce. We investigated physiological and molecular (antioxidant), responses to water deficit, in grassland-model species, Lolium perenne L. and Medicago lupulina L., under future climate conditions, i.e. elevated CO2 (+CO2, +375 ppm) and elevated temperature (+T, +3 degrees C). Elevated CO2, but not warming, significantly increased biomass (gDW) in L. perenne, but not in M. lupulina. Photosynthesis (A(sat)) and stomatal conductance (g(s)), were differently affected by climate in each species, L. perenne generally being more sensitive. Elevated CO2 increased lipid peroxidation levels in M. lupulina, but not in L. perenne, and had no effect on protein oxidation and little effect on antioxidant levels. Drought stress caused severe inhibition in biomass and photosynthesis, most severely in L. perenne, and strongly increased oxidative damage. Elevated CO2 protected against the drought-induced damage. Decreased activities of (A(sat)) and POX may indicate lower levels of oxidative challenge (relaxation) at the level of H2O2 production. Polyphenols, tocopherols and antioxidant capacity, increased under drought stress, in all climate conditions. Elevated CO2, increased reduced ascorbate (ASC) and reduced glutathione (GSH), and their redox status, in both species, although to different levels. Changes in activities of key ASC/GSH cycle enzymes, under stress and climate treatments, showed weak correlations with ASC and GSH levels, indicating the complexity of this network. Together this work supports the idea that redox changes are involved in responses to climate changes, in the absence and presence of water-deficit stress. (C) 2012 Elsevier Masson SAS. All rights reserved.
Language
English
Source (journal)
Plant physiology and biochemistry. - Paris, 1987, currens
Publication
Paris : 2012
ISSN
0981-9428
Volume/pages
59(2012), p. 55-62
ISI
000309622800008
Full text (Publishers DOI)
Full text (publishers version - intranet only)
UAntwerpen
Faculty/Department
Research group
Publication type
Subject
Affiliation
Publications with a UAntwerp address
External links
Web of Science
Record
Identification
Creation 06.12.2012
Last edited 29.05.2017
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