数字农科院2.0

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, MM; Song, JL; Ma, QY; Kong, DL; Zhou, YQ; Jiang, X; Parales, R; Ruan, ZY; Zhang, QH

作者机构：

关键词： Pseudomonas; Nicosulfuron; Microbial Consortium; Culturomics; Response Surface Analysis; Non-Targeted Metabolomics

期刊名称： JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY

ISSN： 0021-8561

年卷期： 2020 年 68 卷 3 期

页码：

收录情况： JCR（2021版） ; EI（2021版）

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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