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Effects of tetracycline on the soil microflora: function, diversity, resistance

  • Kerstin Hund-Rinke
  • Markus Simon
  • Thomas Lukow
Research Article

Abstract

Background

Tetracycline is a widely used antibiotic in animal production. Significant amounts of the substance reach the soil via feces, urine and manure application. As tetracycline is a persistent compound with antibacterial activity, its presence in soil may have undesired direct and indirect effects. These have been investigated so far focusing on effects on selected microbial functions.

Objectives

The aim of the present study was to obtain comprehensive information on potential effects of tetracycline on the soil microflora under environmentally relevant conditions. The investigations included function and structure of the microbial biocoenosis and the distribution of resistance genes.

Methods

Pig manure rich in tetracycline resistance genes was applied to a sandy soil. This soil as well as an unamended soil were additionally treated with several concentrations of tetracycline. The spiked soils were incubated in outdoor lysimeters for several months. Substrate induced respiration, PLFAs, ten selected resistance genes, and the concentrations of tetracycline were determined.

Results

The test concentrations, though far exceeding environmental relevance, caused only small effects. An establishment of resistance could not be detected. Applied resistance genes were not detectable at the end of the study even in the presence of added tetracycline.

Conclusion

Due to the high sorption capacity of the antibiotic, environmentally relevant concentrations of tetracycline do not seem to cause undesired effects on the soil microflora.

Keywords

Antibiotics microbial function microbial structure soil tetracycline resistance 

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Copyright information

© Ecomed Publishers 2004

Authors and Affiliations

  • Kerstin Hund-Rinke
    • 1
  • Markus Simon
    • 1
  • Thomas Lukow
    • 1
  1. 1.Fraunhofer Institute for Molecular Biology and Applied EcologySchmallenbergGermany

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