Insight into the Characteristics and New Mechanism of Nicosulfuron Biodegradation by a Pseudomonas sp. LAM1902
文献类型： 外文期刊
作者： Li, Miaomiao 2 ; Song, Jinlong 3 ; Ma, Qingyun 1 ; Kong, Delong 1 ; Zhou, Yiqing 1 ; Jiang, Xu 1 ; Parales, Rebecca 4 ; R 1 ;
作者机构： 1.Chinese Acad Agr Sci, Beijing, Peoples R China
2.Jiangxi Agr Univ, Nanchang, Jiangxi, Peoples R China
3.Chinese Acad Fishery Sci, Beijing, Peoples R China
4.Univ Calif Davis, Davis, CA 95616 USA
关键词： Pseudomonas; nicosulfuron; microbial consortium; culturomics; response surface analysis; non-targeted metabolomics
期刊名称：JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY （ 影响因子：5.279； 五年影响因子：5.269 ）
ISSN： 0021-8561
年卷期： 2020 年 68 卷 3 期
页码：
收录情况： SCI
摘要： A total of five strains of nicosulfuron-degrading bacteria were isolated from a continuously cultivated microbial consortium using culturomics. Among them, a novel Pseudomonas strain, LAM1902, with the highest degradation efficiency was investigated in detail. The characteristics of nicosulfuron-degradation by LAM1902 were investigated and optimized by response surface analysis. Furthermore, non-targeted metabolomic analysis of extracellular and intracellular biodegradation of nicosulfuron by LAM1902 was carried out by liquid chromatography/mass spectroscopy (LC-MS) and gas chromatography-time-of-flight/mass spectroscopy (GC-TOF/MS). It was found that nicosulfuron was degraded by LAM1902 mainly via breaking the sulfonylurea bridge, and this degradation might be attributed to oxalate accumulation. The results of GC TOF/MS also showed that the intracellular degradation of nicosulfuron did not occur. However, nicosulfuron exerted a significant influence on the metabolism of inositol phosphate, pyrimidine, arginine/proline, glyoxylate, and dicarboxylate metabolism and streptomycin biosynthesis. The changes of myo-inositol, trehalose, and 3-aminoisobutanoic acid were proposed as a mechanism of self-protection against nicosulfuron stress.
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