Oxidative stress induced by a commercial glyphosate formulation in a tolerant strain of Chlorella kessleri.

Autor: Romero DM; Laboratorio de Enzimología, Estrés Oxidativo y Metabolismo, Departamento de Química Biológica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina., Ríos de Molina MC, Juárez AB
Jazyk: angličtina
Zdroj: Ecotoxicology and environmental safety [Ecotoxicol Environ Saf] 2011 May; Vol. 74 (4), pp. 741-7. Date of Electronic Publication: 2010 Nov 12.
DOI: 10.1016/j.ecoenv.2010.10.034
Abstrakt: We studied the toxicity of a glyphosate formulation and provide evidence of metabolic alterations due to oxidative stress caused in a Chlorella kessleri tolerant strain by exposure to the herbicide. After 96 h of exposure to increasing concentrations of the herbicide (0-70 mg L(-1)) with alkylaryl polyglycol ether surfactant, growth was inhibited (EC50-96 h 55.62 mg L(-1)). Glyphosate increased protein and malondialdehyde content which was significantly higher than in the control at 50-70 mg L(-1). Superoxide dismutase and catalase activities and reduced glutathione levels increased in a concentration-dependant manner. Morphological studies showed increases in vacuolisation and in cell and sporangia sizes. The glyphosate formulation studied has a cytotoxic effect on C. kessleri through a mechanism that would involve the induction of oxidative stress. Upon glyphosate exposure, oxidative stress parameters such as SOD and CAT activities and MDA level could be more sensitive biomarkers than usually tested growth parameters in C. kessleri.
(Copyright © 2010 Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
Externí odkaz: