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Chromium accumulation by two Streptomyces spp. isolated from riverine sediments
M J Amoroso1, G R Castro, A Durán
1Instituto de Microbiología, Facultad de Bioquímica, Química y Farmacia, Universidad Nacional de Tucumán, Ayacucho 491, Tucumán 4000, Argentina.
Journal of Industrial Microbiology & Biotechnology
|July 21, 2001
Summary
Two Streptomyces strains, R22 and R25, from Argentina exhibit high chromium resistance and accumulation. These chromium-resistant bacteria show potential for bioremediation of contaminated environments.
Area of Science:
- Microbiology
- Environmental Science
- Biotechnology
Background:
- Chromium contamination poses environmental risks.
- Microbial resistance and accumulation offer bioremediation strategies.
Purpose of the Study:
- To isolate and characterize chromium-resistant bacteria.
- To assess the chromium accumulation potential of isolated strains.
- To explore applications in chromium bioremediation.
Main Methods:
- Isolation of bacteria from Salí River sediments.
- Identification using 16S rRNA sequencing.
- Growth assays in chromium-containing media.
- Chromium accumulation quantification.
- Cell fractionation studies.
Main Results:
- Two highly chromium-resistant strains, R22 and R25, identified as Streptomyces spp.
- Strains R22 and R25 accumulated significant amounts of chromium (10.0 and 5.6 mg Cr g(-1) dry weight, respectively).
- Chromium was primarily associated with the cell wall fraction in strain R22.
Conclusions:
- Streptomyces strains R22 and R25 demonstrate robust chromium resistance and accumulation capabilities.
- These findings suggest potential applications for these strains in the bioremediation of chromium-polluted sites.
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