Microbial degradation of fomesafen by a newly isolated strain pseudomonas zeshuii by-1 and the biochemical degradation pathway

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[1] [1,Feng, Zhao-Zhong
[2] Li, Qin-Fen
[3] Zhang, Jun
[4] Zhang, Jing
[5] Huang, Xing
[6] Lu, Peng
[7] Li, Shun-Peng
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Huang, X. (huangxing@njau.edu.cn) | 1600年 / American Chemical Society卷 / 60期
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Fomesafen is a diphenyl ether herbicide used to control the growth of broadleaf weeds in bean fields. Although the degradation of fomesafen in soils was thought to occur primarily by microbial activity; little was known about the kinetic and metabolic behaviors of this herbicide. This paper reported the capability of the newly isolated strain Pseudomonas zeshuii BY-1 to use fomesafen as the sole source of carbon in pure culture for its growth. Up to 88.7% of 50 mg of L-1 fomesafen was degraded by this bacterium in mineral medium within 3 days. Strain BY-1 could also degrade other diphenyl ethers; including lactofen; acifluorfen; and fluoroglycofen. During the fomesafen degradation; five metabolites were detected and identified by liquid chromatography-mass spectrometry and tandem mass spectrometry. The primary degradation pathway of fomesafen might be the reduction of the nitro group to an amino group; followed by the acetylation of the amino derivative; dechlorination; and cleavage of the S-N bond. The addition of the BY-1 stain into soils treated with fomesafen resulted in a higher degradation rate than that observed in uninoculated soils; and the bacteria community in contaminated soil recovered after inoculation of the BY-1 stain. On the basis of these results; strain P. zeshuii BY-1 has the potential to be used in the bioremediation of fomesafen-contaminated soils. © 2012 American Chemical Society;
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