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Biodegradation of imidacloprid and diuron by Simplicillium sp. QHSH-33

文献类型： 外文期刊

作者： Xu, Ke 1 ; Ke, Xin-Ran 1 ; Zhang, Wan-Ting 1 ; Wu, Xin-Yuan 1 ; Song, Zhi-Jun 1 ; Jiao, Mei-Juan 1 ; Gao, Xiao-Juan 1 ; Zhou, Li 1 ; Ji, Hong-Yan 2 ; Wang, Fang 3 ; Wu, Xiu-Li 1 ;

作者机构： 1.Ningxia Med Univ, Coll Pharm, Key Lab Protect Dev & Utilizat Med Resources Liupa, Minist Educ, Yinchuan 750004, Peoples R China

2.Gen Hosp Ningxia Med Univ, Dept Pharmaceut, Gen Hosp, Yinchuan 750004, Peoples R China

3.Ningxia Acad Agr & Forestry Sci, Inst Plant Protect, Yinchuan 750004, Peoples R China

关键词： Imidacloprid; Diuron; Biodegradation; Degradation products; Whole genome analysis

期刊名称：PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY （ 影响因子：4.0； 五年影响因子：4.5 ）

ISSN： 0048-3575

年卷期： 2024 年 206 卷

页码：

收录情况： SCI

摘要： Imidacloprid (IMI) and diuron (DIU) are widely used pesticides in agricultural production. However, their excessive use and high residues have caused harm to the ecological environment and human health. Microbial remediation as an efficient and low-toxic method has become a research hotspot for controlling environmental pollutants. A fungus QHSH-33, identified as Simplicillium sp., has the ability to degrade neonicotinoids IMI and phenylurea DIU. When QHSH-33 and pesticide were co-cultured in liquid medium for 7 days, the degradation rates of IMI and DIU by QHSH-33 in simulated field soil microenvironment were 50.19 % and 70.57 %, respectively. Through HPLC-MS analysis, it was found that the degradation of IMI mainly involved nitro reduction, hydroxylation and other reactions. Three degradation pathways and eight degradation products were identified, among which two metabolites were obtained by microbial transformation of IMI for the first time. The degradation of DIU mainly involved demethylation and dehalogenation reactions, and two degradation pathways and four degradation products were identified, one of which was a new degradation product of DIU. Toxicity assessment demonstrated that most of the degradation products might be considerably less harmful than IMI and DIU. Whole genome sequencing of QHSH-33 revealed a genome size of 33.2 Mbp with 11,707 genes. The genome of QHSH-33 was annotated by KEGG to reveal 128 genes related to exogenous degradation and metabolism. After local blast with reported IMI and DIU degrading enzymes, seven IMI-degrading related genes and seven DIUdegrading related genes were identified in the QHSH-33 genome. The results of this study will help to expand our knowledge on the microbial decomposition metabolism of IMI and DIU, and provide new insights into the degradation mechanism of IMI and DIU in soil and pure culture system, laying a foundation for QHSH-33 strain applied to the removal, biotransformation or detoxification of IMI and DIU.

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