Estudo da resposta antioxidativa de linhagens bacterianas na presença do herbicida Acetochlor / Study of the response antioxidative of bacterial strains in the presence of herbicide Acetochlor

AUTOR(ES)

Giselle de Carvalho

DATA DE PUBLICAÇÃO

2008

RESUMO

Currently there is a great concern with respect to short and long term effects that many herbicides may cause on public health and the environment. They may seriously damage the cellular metabolism, generally leading to inhibition of the microbial growth. With the exposure to herbicides, these microorganisms significantly increase the generation of EAOs (Active Oxygen Species), generating a state of oxidative stress. The aim of this work was to study the effect of acetochlor herbicide in the response of antioxidant system. Three strains of the bacteria Klebsiella oxytoca were grown in a nutritional media containing the herbicide in concentrations of 0, 62 and 620 mM. The protein profile was evaluated in SDS-PAGE, which showed differences in the intensity of the bands, as well as the presence and absence in the media with herbicide. The oxidative stress was evaluated through the lipid peroxidation, and herbicide caused stress in all the three strains, mainly at the concentration of 620 mM. The activities of Catalase (CAT) and Superoxide Dismutase (SOD) were higher for the three strains in the concentration of 62 mM followed by a decrease at the concentration of 620 mM. For Glutathione Reductase (GR) it was observed a gradual reduction in its activity with the increase of herbicide concentration for all the three strains. However, in the case of Glutathione-S-transferase (GST) activity, the three strains showed differential behavior for the same treatments. The study of the antioxidative response of microorganisms in the presence of xenobiotics is important for the understanding of tolerance mechanisms, biodegradation as well as for application in the bioremediation of contaminated environments.

ASSUNTO(S)

oxidative stress estresse oxidativo antioxidative enzymes. bactéria - metabolismo herbicidas - toxidade. herbicide bacteria acetochlor

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