Biodegradation of nicosulfuron by a Talaromyces flavus LZM1

• DOI: 10.1016/j.biortech.2013.02.086
• Publication Date: 2013-03-14T04:03:42Z
• Authors: Jinlong Song; Jingang Gu; Yi Zhai; Wei Wu; Haisheng Wang; Zhiyong Ruan; Yanhua Shi; Yanchun Yan
• Keywords: Base Sequence; Mycelium; Herbicides; Pyridines; Molecular Sequence Data; Temperature; 0211 other engineering and technologies; 02 engineering and technology; Hydrogen-Ion Concentration; Kinetics; Biodegradation, Environmental; Sulfonylurea Compounds; Talaromyces; DNA, Ribosomal Spacer; Phylogeny

The fungal strain LZM1 was isolated from activated sludge and found to be capable of utilizing nicosulfuron as the sole nitrogen source for growth. Based on morphological and internal transcribed spacer evaluations, LZM1 was identified as a Talaromyces flavus strain. Under optimum conditions (pH 6.1, 29°C), T. flavus LZM1 degraded 100% of the initially added nicosulfuron (100 mg L(-1)) within 5d. T. flavus LZM1 was also found to be highly efficient in degrading tribenuron methyl, chlorsulfuron, bensulfuron methyl, ethametsulfuron methyl, cinosulfuron, and rimsulfuron. Metabolites from nicosulfuron degradation were identified by liquid chromatography mass spectrometry, and a possible degradation pathway was deduced. These results show that T. flavus LZM1 may possess potential to be used in bioremediation of nicosulfuron-contaminated environments.