Abstract
The pyrazosulfuron-ethyl-degrading bacterium, designated as CW17, was isolated from contaminated soil near the warehouse of the factory producing pyrazosulfuron-ethyl in Changsha city, China. The strain CW17 was identified as Acinetobacter sp. based on analyses of 94 carbon source utilization or chemical sensitivity in Biolog microplates, conventional phenotypic characteristics, and 16S rRNA gene sequencing. When pyrazosulfuron-ethyl was provided as the sole carbon source, the effects of pyrazosulfuron-ethyl concentration, pH, and temperature on biodegradation were examined. The degradation rates of pyrazosulfuron-ethyl at initial concentrations of 5.0, 20.0, and 50.0 mg/L were 48.0%, 77.0%, and 32.6%, respectively, after inoculation for 7 days. The growth of the strain was inhibited at low pH buffers. The chemical degradation occurs much faster at low pH than at neutral and basic pH conditions. The degradation rate of pyrazosulfuron-ethyl at 30°C was faster than those at 20 and 37°C by CW17 strains. Two metabolites of degradation were analyzed by liquid chromatography–mass spectroscopy (LC/MS). Based on the identified products, strain CW17 seemed to be able to degrade pyrazosulfuron-ethyl by cleavage of the sulfonylurea bridge.
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Acknowledgements
This work was supported by National Natural Science Foundation of China (Grant no. 31171891, 31160375) and Postgraduate Innovation Program of Hunan Province (Grant no. CX2011B288).
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L. Bai and D. Zeng contributed equally to this manuscript
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Wang, Y., Du, L., Chen, Y. et al. Biodegradation of pyrazosulfuron-ethyl by Acinetobacter sp. CW17. Folia Microbiol 57, 139–147 (2012). https://doi.org/10.1007/s12223-012-0107-8
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DOI: https://doi.org/10.1007/s12223-012-0107-8