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The cellular redox state as a modulator in cadmium and copper responses in Arabidopsis thaliana seedlings.
- Source :
-
Journal of plant physiology [J Plant Physiol] 2011 Mar 01; Vol. 168 (4), pp. 309-16. Date of Electronic Publication: 2010 Sep 15. - Publication Year :
- 2011
-
Abstract
- The cellular redox state is an important determinant of metal phytotoxicity. In this study we investigated the influence of cadmium (Cd) and copper (Cu) stress on the cellular redox balance in relation to oxidative signalling and damage in Arabidopsis thaliana. Both metals were easily taken up by the roots, but the translocation to the aboveground parts was restricted to Cd stress. In the roots, Cu directly induced an oxidative burst, whereas enzymatic ROS (reactive oxygen species) production via NADPH oxidases seems important in oxidative stress caused by Cd. Furthermore, in the roots, the glutathione metabolism plays a crucial role in controlling the gene regulation of the antioxidative defence mechanism under Cd stress. Metal-specific alterations were also noticed with regard to the microRNA regulation of CuZnSOD gene expression in both roots and leaves. The appearance of lipid peroxidation is dual: it can be an indication of oxidative damage as well as an indication of oxidative signalling as lipoxygenases are induced after metal exposure and are initial enzymes in oxylipin biosynthesis. In conclusion, the metal-induced cellular redox imbalance is strongly dependent on the chemical properties of the metal and the plant organ considered. The stress intensity determines its involvement in downstream responses in relation to oxidative damage or signalling.<br /> (Copyright © 2010 Elsevier GmbH. All rights reserved.)
- Subjects :
- Arabidopsis enzymology
Arabidopsis metabolism
Cadmium metabolism
Copper metabolism
Gene Expression drug effects
Gene Expression Regulation, Plant
Genes, Plant genetics
Hydrogen Peroxide metabolism
Lipid Peroxidation
Models, Biological
Oxidation-Reduction
Oxidative Stress drug effects
Plant Leaves drug effects
Plant Leaves metabolism
Plant Proteins genetics
Plant Proteins metabolism
Plant Roots drug effects
Plant Roots metabolism
Reactive Oxygen Species metabolism
Seedlings enzymology
Seedlings metabolism
Signal Transduction
Stress, Physiological
Arabidopsis drug effects
Cadmium pharmacology
Copper pharmacology
Oxidative Stress physiology
Seedlings drug effects
Subjects
Details
- Language :
- English
- ISSN :
- 1618-1328
- Volume :
- 168
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Journal of plant physiology
- Publication Type :
- Academic Journal
- Accession number :
- 20828869
- Full Text :
- https://doi.org/10.1016/j.jplph.2010.07.010