Imazamox microbial degradation by common clinical bacteria:Acinetobacter baumannii IB5 isolated from black soil in China shows high potency

LIU Chun-guang; YANG Xin; LAI Yang; LU Hong-gang; ZENG Wei-min; GENG Gui; YANG Feng-shan

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Imazamox microbial degradation by common clinical bacteria:Acinetobacter baumannii IB5 isolated from black soil in China shows high potency

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Herbicidal residues of imazamox are hazardous to some sensitive rotational aftercrops.The aim of the study was to isolate and identify a microbial strain capable of degrading imazamox.The strain IB5,capable of efficiently degrading imazamox,was isolated from an imazamox-contaminated soybean field in Heilongjiang Province,China.It was found to degrade 98.61%of 400 mg L^(-1) imazamox within 48 h by high-performance liquid chromatograph.Through morphological,physiological and biochemical characterization,and the 16 S rDNA sequencing,the strain was identified as Acinetobacter baumannii.An optimal degradation condition was obtained and verified:400 mg L^(-1) imazamox,0.1%(volume ratio) initial inoculum,37℃and pH 7.0.Four main products were captured in the liquid chromatograms and mass spectra,and a pathway for imazamox degradation by IB5 was proposed.This work provides a new suitable candidate for imazamox biodegradation and theoretical evidence for imazamox residue bioremediation.A.baumannii is a common clinical bacteria,but its imazamox-degrading feature has not been reported previously.

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《农业科学学报（英文版）》 |2016年第8期|1798-1807|共10页
作者
LIU Chun-guang; YANG Xin; LAI Yang; LU Hong-gang; ZENG Wei-min; GENG Gui; YANG Feng-shan;
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Key Laboratory of Microbiology, Life Science College, Heilongjiang University, Harbin 150080, P.R.China;

Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education, Harbin 150501, P.R.China;

Sugar Beet Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150080, P.R.China;

Key Laboratory of Microbiology, Life Science College, Heilongjiang University, Harbin 150080, P.R.China;

Key Laboratory of Microbiology, Life Science College, Heilongjiang University, Harbin 150080, P.R.China;

Key Laboratory of Microbiology, Life Science College, Heilongjiang University, Harbin 150080, P.R.China;

Key Laboratory of Microbiology, Life Science College, Heilongjiang University, Harbin 150080, P.R.China;

Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education, Harbin 150501, P.R.China;

Sugar Beet Research Institute, Chinese Academy of Agricultural Sciences, Harbin 150080, P.R.China;

Crop Research Institute, Heilongjiang University, Harbin 150080, P.R.China;

Key Laboratory of Microbiology, Life Science College, Heilongjiang University, Harbin 150080, P.R.China;

Engineering Research Center of Agricultural Microbiology Technology, Ministry of Education, Harbin 150501, P.R.China;

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Imazamox microbial degradation by common clinical bacteria:Acinetobacter baumannii IB5 isolated from black soil in China shows high potency

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