Construction of a fusant bacterial strain simultaneously degrading atrazine and acetochlor and its application in soil bioremediation

IF 8.2 1区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Science of the Total Environment Pub Date : 2025-01-25 DOI:10.1016/j.scitotenv.2025.178478
Yue Liu , Qianhang Zhai , Jiaxu Lv , Yulin Wu , Xuewei Liu , Hao Zhang , Xian Wu
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Abstract

Application of herbicide-degrading bacteria is an effective strategy to remove herbicide in soil. However, the ability of bacteria to degrade a herbicide is often severely limited in the presence of other pesticide. In this study, the atrazine-degrading strain Klebsiella varicola FH-1 and acetochlor-degrading strain Bacillus Aryabhatti LY-4 were used as parent strains to construct the recombinant RH-92 strain through protoplast fusion technology. Compared with the parent strains, RH-92 exhibited enhanced ability to degrade herbicide mixture containing atrazine and acetochlor, exhibiting 63.16 % and 68.48 % higher degradation rates, respectively. RAPD analysis showed that gene rearrangement occurred during protoplast fusion, and the genetic similarity indexes of the fused strain RH-92 and the two parent strains were 0.5853 and 0.4240, respectively. HPLC-MS analysis confirmed that RH-92 shared similar degradation products and pathways with both parent strains but exhibited a novel metabolic pathway for the continuous degradation of CMEPA (degradation product of acetochlor) into MEA through amide bond hydrolysis. The activities of GSH, GST and SOD of RH-92 increased and the level of MDA decreased under the stress of compound herbicides. Strain RH-92 did not show a large number of bacterial apoptosis, and maintained good cell membrane integrity and permeability. The half-lives of atrazine and acetochlor were 4.9 d and 7.6 d when the parent strains FH-1 and LY-4 were applied in unsterilized soil containing herbicide mixture treatment,the application fusant RH-92 strain significantly reduced the half-life to 1.6 and 1.8 d, respectively. Furthermore, 16S rRNA sequencing indicated that RH-92 application effectively restored bacterial taxa with diminished relative abundances under herbicide mixture treatment, ameliorated phytotoxicity in soybean seedlings, and promoted enhanced vegetative growth in the roots and plant height. This study highlighted the application of fusant strains as a bioremediation strategy for combatting atrazine and acetochlor pollution in soil and provided theoretical insights.

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同时降解阿特拉津和乙草胺的融合菌株的构建及其在土壤生物修复中的应用。
施用除草剂降解菌是去除土壤中除草剂的有效手段。然而,细菌降解除草剂的能力往往在存在其他农药的情况下受到严重限制。本研究以降解阿特拉津的水痘克雷伯菌FH-1和降解乙酰氯的Aryabhatti芽孢杆菌LY-4为亲本菌株,通过原生质体融合技术构建重组菌株RH-92。与亲本菌株相比,RH-92对莠去津和乙草胺混合除草剂的降解能力增强,降解率分别提高63.16%和68.48%。RAPD分析表明,原生质体融合过程中发生了基因重排,融合菌株RH-92与两个亲本菌株的遗传相似指数分别为0.5853和0.4240。HPLC-MS分析证实,RH-92与亲本菌株具有相似的降解产物和途径,但表现出一种新的代谢途径,通过酰胺键水解将CMEPA(乙草胺降解产物)持续降解为MEA。在复合除草剂胁迫下,RH-92的GSH、GST和SOD活性升高,MDA水平降低。菌株RH-92未出现大量细菌凋亡,保持了良好的细胞膜完整性和通透性。母本菌株FH-1和y -4在未消毒的含除草剂混合土壤中施用时,阿特拉津和乙酰草胺的半衰期分别为4.9 d和7.6 d,施用融合剂RH-92显著降低了半衰期,分别为1.6 d和1.8 d。此外,16S rRNA测序结果表明,RH-92有效恢复了混合除草剂处理下相对丰度降低的细菌类群,改善了大豆幼苗的植物毒性,促进了根系的营养生长和株高。本研究强调了融合菌株作为对抗土壤中阿特拉津和乙草胺污染的生物修复策略的应用,并提供了理论见解。
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来源期刊
Science of the Total Environment
Science of the Total Environment 环境科学-环境科学
CiteScore
17.60
自引率
10.20%
发文量
8726
审稿时长
2.4 months
期刊介绍: The Science of the Total Environment is an international journal dedicated to scientific research on the environment and its interaction with humanity. It covers a wide range of disciplines and seeks to publish innovative, hypothesis-driven, and impactful research that explores the entire environment, including the atmosphere, lithosphere, hydrosphere, biosphere, and anthroposphere. The journal's updated Aims & Scope emphasizes the importance of interdisciplinary environmental research with broad impact. Priority is given to studies that advance fundamental understanding and explore the interconnectedness of multiple environmental spheres. Field studies are preferred, while laboratory experiments must demonstrate significant methodological advancements or mechanistic insights with direct relevance to the environment.
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