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Root-level exposure reveals multiple physiological toxicity of triazine xenobiotics in Arabidopsis thaliana.
- Source :
-
Journal of plant physiology [J Plant Physiol] 2017 May; Vol. 212, pp. 105-114. Date of Electronic Publication: 2017 Feb 20. - Publication Year :
- 2017
-
Abstract
- Herbicides are pollutants of great concern due to environmental ubiquity resulting from extensive use in modern agriculture and persistence in soil and water. Studies at various spatial scales have also highlighted frequent occurrences of major herbicide breakdown products in the environment. Analysis of plant behavior toward such molecules and their metabolites under conditions of transient or persistent soil pollution is important for toxicity evaluation in the context of environmental risk assessment. In order to understand the mechanisms underlying the action of such environmental contaminants, the model plant Arabidopsis thaliana, which has been shown to be highly responsive to pesticides and other xenobiotics, was confronted with varying levels of the widely-used herbicide atrazine and of two of its metabolites, desethylatrazine and hydroxyatrazine, which are both frequently detected in water streams of agriculturally-intensive areas. After 24h of exposure to varying concentrations covering the range of triazine concentrations detected in the environment, root-level contaminations of atrazine, desethylatrazine and hydroxyatrazine were found to affect early growth and development in various dose-dependent and differential manners. Moreover, these differential effects of atrazine, desethylatrazine and hydroxyatrazine pointed to the involvement of distinct mechanisms directly affecting respiration and root development. The consequences of the identification of additional targets, in addition to the canonical photosystem II target, are discussed in relation with the ecotoxicological assessment of environmental xenobiotic contamination.<br /> (Copyright © 2017 Elsevier GmbH. All rights reserved.)
- Subjects :
- Agriculture
Atrazine toxicity
Biomass
Carbon Dioxide metabolism
Chlorophyll
Ecosystem
Environmental Pollutants toxicity
Herbicides chemistry
Herbicides toxicity
Models, Biological
Photosynthesis drug effects
Photosystem II Protein Complex drug effects
Plant Roots metabolism
Seeds growth & development
Soil chemistry
Soil Pollutants analysis
Water Pollution
Arabidopsis drug effects
Arabidopsis growth & development
Plant Roots drug effects
Plant Roots growth & development
Stress, Physiological drug effects
Triazines toxicity
Xenobiotics toxicity
Subjects
Details
- Language :
- English
- ISSN :
- 1618-1328
- Volume :
- 212
- Database :
- MEDLINE
- Journal :
- Journal of plant physiology
- Publication Type :
- Academic Journal
- Accession number :
- 28282526
- Full Text :
- https://doi.org/10.1016/j.jplph.2017.01.013