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EXPOSURE OF A TROPICAL SOIL TO MG/KG OF OXYTETRACYCLINE ELICITS HORMETIC RESPONSES IN THE CATABOLIC ACTIVITIES OF ITS MICROBIAL COMMUNITY
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Abstract
Many farmers in developing countries protect their crops with oxytetracycline and fertilize their farmlands with manure from animals that received this drug as growth promoter. In this study, a tropical soil was exposed to 0.1 mg kg-1, 1 mg kg-1, and 10 mg kg-1 of oxytetracycline for 22 days to evaluate whether this antibiotic alters the capacity of a soil microbial community to metabolize 31 carbon sources. The communities exposed to 1 and 10 mg kg-1 of oxytetracycline exhibited reduced catabolic activities for 3 and 6 substrates, respectively. In contrast, the communities exposed to 0.1 mg kg-1 of oxytetracycline showed higher catabolic activities than the controls and the other two treatments for 19 substrates. These data reveal a hormetic response at the community level not previously described for soil bacteria and oxytetracycline.
Type
article
article
article
Date
2011-09-01