TY - JOUR
T1 - Survival of naphthalene-degrading Pseudomonas putida NCIB 9816-4 in naphthalene-amended soils
T2 - Toxicity of naphthalene and its metabolites
AU - Park, W.
AU - Jeon, C. O.
AU - Cadillo, H.
AU - DeRito, C.
AU - Madsen, E. L.
N1 - Funding Information:
Acknowledgements This research was supported by National Science Foundation Grant MCB-0084175 to E.L.M. We thank Dr. Niels Kroer (National Environmental Research Institute, Denmark) for P. putida KT2440-Tc, and Dr. Hay for guidance on derivatization procedures.
Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2004/4
Y1 - 2004/4
N2 - Survival of naphthalene-degrading Pseudomonas putida NCIB 9816-4 was measured in nonsterile soil samples (coal tar-contaminated and pristine) with and without added crystalline naphthalene over a period of 21 days. A 2-3 log decrease in cfu occurred in the presence, but not absence, of added naphthalene. We used aqueous suspensions of crystalline naphthalene to explore potential mechanisms of its toxicity on the test bacterium under aerobic conditions. Measurements of dissolved naphthalene in medium indicated that uptake by P. putida NCIB 9816-4 maintained naphthalene at concentrations well below saturation. Accumulation of catechol was documented by high-performance liquid chromatography and gas chromatography/mass spectrometry in the presence of 0.5% (w/v) naphthalene crystals. Transient catechol accumulation was highest when cells entered stationary phase. A decrease in catechol concentration correlated with the development of brown color in the medium. Brown pigment accumulation correlated with a decrease in viable cell counts. These results suggested that catechol, related compounds, and their condensation products can accumulate to toxic levels in stationary phase P. putida NCIB 9816-4 cells. We hypothesize that the same mechanism of toxicity may occur under the nutrient-limited conditions expected in soil.
AB - Survival of naphthalene-degrading Pseudomonas putida NCIB 9816-4 was measured in nonsterile soil samples (coal tar-contaminated and pristine) with and without added crystalline naphthalene over a period of 21 days. A 2-3 log decrease in cfu occurred in the presence, but not absence, of added naphthalene. We used aqueous suspensions of crystalline naphthalene to explore potential mechanisms of its toxicity on the test bacterium under aerobic conditions. Measurements of dissolved naphthalene in medium indicated that uptake by P. putida NCIB 9816-4 maintained naphthalene at concentrations well below saturation. Accumulation of catechol was documented by high-performance liquid chromatography and gas chromatography/mass spectrometry in the presence of 0.5% (w/v) naphthalene crystals. Transient catechol accumulation was highest when cells entered stationary phase. A decrease in catechol concentration correlated with the development of brown color in the medium. Brown pigment accumulation correlated with a decrease in viable cell counts. These results suggested that catechol, related compounds, and their condensation products can accumulate to toxic levels in stationary phase P. putida NCIB 9816-4 cells. We hypothesize that the same mechanism of toxicity may occur under the nutrient-limited conditions expected in soil.
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U2 - 10.1007/s00253-003-1420-6
DO - 10.1007/s00253-003-1420-6
M3 - Article
C2 - 12928756
AN - SCOPUS:2442593799
SN - 0175-7598
VL - 64
SP - 429
EP - 435
JO - Applied Microbiology and Biotechnology
JF - Applied Microbiology and Biotechnology
IS - 3
ER -