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Lindane removal induction by Streptomyces sp. M7.

C S Benimeli1, G R Castro, A P Chaile

  • 1PROIMI-CONICET, Av. Belgrano y Caseros, 4000 Tucumán, Argentina.

Journal of Basic Microbiology
|September 30, 2006
PubMed
Summary

This study shows that Streptomyces M7 can degrade the toxic pesticide lindane (gamma-hexachlorocyclohexane). Optimal degradation occurred when lindane was added during the microorganism

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Area of Science:

  • Environmental microbiology
  • Bioremediation
  • Pesticide degradation

Background:

  • Lindane (gamma-hexachlorocyclohexane) is a persistent and toxic pesticide causing environmental contamination.
  • Effective bioremediation strategies are needed to address lindane pollution.

Purpose of the Study:

  • To investigate the impact of low glucose concentration and lindane addition timing on the detoxification capabilities of Streptomyces M7.
  • To understand the microbial degradation of lindane as a carbon source.

Main Methods:

  • Culturing Streptomyces M7 in a synthetic medium with low glucose (0.6 g/l).
  • Adding lindane (100 µg/l) at different incubation times (0, 6, and 20 hours).
  • Monitoring microbial growth, glucose consumption, lindane degradation, and chloride release over 96 hours.

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Main Results:

  • A diauxic growth pattern was observed, with glucose consumed first, followed by lindane utilization.
  • Lindane removal was enhanced when added at 20 hours of incubation compared to 0 or 6 hours.
  • Significant chloride ion release (up to 86%) indicated lindane degradation, particularly when added at 20 hours.

Conclusions:

  • Streptomyces M7 can degrade lindane under aerobic conditions, utilizing it as a carbon source.
  • The timing of lindane addition significantly influences its microbial degradation efficiency.
  • This study provides the first report of chloride release from lindane degradation by Streptomyces sp., suggesting a novel bioremediation pathway.