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Nicosulfuron Biodegradation by a Novel Cold-Adapted Strain Oceanisphaera psychrotolerans LAM-WHM-ZC

Zhou, Shan, Song, Jinlong, Dong, Weiwei, Mu, Yingchun, Zhang, Qi, Fan, Ziwen, Wang, Yanwei, Kong, Delong, Zhou, Yiqing, Jiang, Xu, Zhao, Bin, Han, Gang, Ruan, Zhiyong
Journal of agricultural and food chemistry 2017 v.65 no.47 pp. 10243-10249
bensulfuron, biodegradation, chlorsulfuron, crop damage, experimental design, mass spectrometry, metabolites, nicosulfuron, pollutants, rimsulfuron, soil, temperature, ultra-performance liquid chromatography
Nicosulfuron is a common environmental pollutant, posing a great threat to aquatic systems and causing significant damage to crops. This study reported a cold-adapted strain Oceanisphaera psychrotolerans LAM-WHM-ZC, which efficiently degrades nicosulfuron over a wide range of temperatures (5 to 40 °C). The Box–Behnken design method was used to optimize the degradation conditions. O. psychrotolerans LAM-WHM-ZC can degrade 92.4% and 74.6% of initially supplemented 100 mg/L nicosulfuron under the optimum and low temperature of 18.1 and 5 °C, respectively, within 7 days. O. psychrotolerans LAM-WHM-ZC was found to be highly efficient in degrading cinosulfuron, chlorsulfuron, rimsulfuron, bensulfuron methyl, and ethametsulfuron methyl. Metabolites from nicosulfuron degradation were identified by UPLC-MS, and a possible degradation pathway was proposed. Furthermore, O. psychrotolerans LAM-WHM-ZC can also degrade nicosulfuron in soil; 78.6% and 67.4% of the initial nicosulfuron supplemented at 50 mg/kg were removed at 18.1 and 5 °C, respectively, within 15 days.