Environmental biology

Aromatic compound degradation by iron reducing bacteria isolated fromirrigated tropical paddy soils

LU Wenjing , WANG Hongtao , HUANG Changyong , W. Reichardt


Received January 07, 2008,Revised May 15, 2008, Accepted , Available online

Volume 20,2008,Pages 1487-1493

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Forty-six candidate phenol/benzoate degrading-iron reducing bacteria were isolated from long term irrigated tropical paddy soils by enrichment procedures. Pure cultures and some prepared mixed cultures were examined for ferric oxide reduction and phenol/benzoate degradation. All the isolates were iron reducers, but only 56.5% could couple iron reduction to phenol and/or benzoate degradation, as evidenced by depletion of phenol and benzoate after one week incubation. Analysis of degradative capability using Biolog MT plates revealed that most of them could degrade other aromatic compounds such as ferulic acid, vanillic acid, and hydroxybenzoate. Mixedcultures and soil samples displayed greater capacity for aromatic degradation and iron reduction than pure bacterial isolates, suggesting that these reactions may be coupled via a consortia-based mechanism in paddy soils.

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