Metabolism of nitrophenols by bacteria isolated from parathion-amended flooded soil |
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Authors: | Sudhakar-Barik R. Siddaramappa N. Sethunathan |
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Affiliation: | (1) Laboratory of Soil Microbiology, Central Rice Research Institute, Cuttack-6, Orissa, India |
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Abstract: | Two bacterial isolates from parathion-amended flooded soil, Pseudomonas sp. and Bacillus sp., were examined for their ability to decompose nitrophenols. Uniformly labelled 14C-p-nitrophenol was metabolized by both bacteria, 14CO2 and nitrite being end products. A substantial portion (23% for Pseudomonas sp. and 80% for Bacillus sp.) of radioactivity applied as p-nitrophenol was accounted for as 14CO2 at the end of a 72-h period; 8 to 16% remained in the water phase after solvent extraction. Pseudomonas sp. produced nitrite also from 2,4-dinitrophenol, but only after a lag, and not from o- and m-nitrophenols. Interestingly, m-nitrophenol, known for its resistance to biodegradation because of meta substitution, was decomposed by Bacillus sp., resulting in the formation of nitrite and phenol; o-nitrophenol and 2,4-dinitrophenol resisted degradation by this bacterium. |
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