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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/8996

Title: Effects of uranium and phosphate concentrations on oxidative stress related responses induced in Arabidopsis thaliana
Authors: Vanhoudt, Nathalie
Vandenhove, Hildegarde
Smeets, Karen
Remans, Tony
Van Hees, May
Wannijn, Jean
Vangronsveld, Jaco
Cuypers, Ann
Issue Date: 2008
Citation: PLANT PHYSIOLOGY AND BIOCHEMISTRY, 46(11). p. 987-996
Abstract: The production of reactive oxygen species (ROS) and the induction of the antioxidative defense mechanism are very important in heavy metal toxicity. In this study, biological effects induced after uranium contamination were investigated for Arabidopsis thaliana. Three-week-old seedlings were exposed for 4 days to 100 mu M U in an adjusted Hoagland solution. Uranium exposure caused a decreased growth of leaves (38%) and roots (70%) and a modified nutrient profile was observed. Investigation of lipid peroxidation products indicated a significant increase of membrane damage. Important ROS-producing and -scavenging enzymes were studied at transcriptional and protein level to investigate the importance of the ROS-signature in uranium toxicity. Elevated gene expression was observed for NADPH-oxidase, a ROS-producing enzyme. Changes in gene expression for different ROS-scavenging enzymes as Cu/ZnSOD. FeSOD and APX were also observed. Analysis of enzyme capacities showed little effects after uranium contamination. Higher ascorbate levels in uranium exposed leaves suggested an increase of antioxidative defense via the ascorbate-glutathione pathway after uranium exposure. Theoretical calculations indicated rapid formation of uranium-phosphate precipitates if normal phosphate concentrations are used. Precipitation tests recommend the use of 25 mu M P in combination with 100 mu M U to inhibit uranium precipitation. Because this combination was used for uranium toxicity investigation, the influence of this low phosphate concentration on plant growth and oxidative stress had to be evaluated. Minor differences between low phosphate (25 mu M P) and high phosphate ( 100 mu M P) treatments were observed justifying the use of the low phosphate concentration in combination with uranium. (C) 2008 Elsevier Masson SAS. All rights reserved.
Notes: [Vanhoudt, Nathalie; Vandenhove, Hildegarde; Van Hees, May; Wannijn, Jean] CEN SCK, Biosphere Impact Studies, Belgian Nucl Res Ctr, B-2400 Mol, Belgium. [Vanhoudt, Nathalie; Smeets, Karen; Remans, Tony; Vangronsveld, Jaco; Cuypers, Ann] Hasselt Univ, B-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/8996
DOI: 10.1016/j.plaphy.2008.06.003
ISI #: 000260809800007
ISSN: 0981-9428
Category: A1
Type: Journal Contribution
Validation: ecoom, 2009
Appears in Collections: Research publications

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