微塑料对土壤中土霉素及其相关抗性基因消散的影响(不含沙雷氏菌和含沙雷氏菌):生物可降解塑料与传统微塑料的比较

IF 6.2 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Ecotoxicology and Environmental Safety Pub Date : 2024-11-04 DOI:10.1016/j.ecoenv.2024.117235
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引用次数: 0

摘要

将生物降解的(聚己二酸丁二醇酯:PBAT)和传统的(聚乙烯:PE)微塑料(MPs)以 0.5 %、1 % 和 2 % 的剂量(w/w)添加到含有或不含有 Serratia marcescens ZY01(ZY01,一种 tet 宿主菌株)的土壤中,以了解它们对土霉素(OTC)和 tet 降解的不同影响。结果表明,在不含 ZY01 的土壤中,不同剂量的 PBAT MP 对 OTC 生物降解的抑制程度不同;而在不含 ZY01 的土壤中,不同剂量的 PE MP 对 OTC 生物降解的增强程度没有变化。这些差异是由于 OTC 对 PBAT MP 的吸附能力更强,以及 PBAT MP 对微生物的毒性更强。除土壤有机质外,pH 值和总磷分别是调节含 MPs(如氮循环细菌 Steroidobacter 和 Nitrospira)和 MPs + ZY01(如磷循环细菌 Saccharimonadales 和 Haliangium)土壤中特定四寄主细菌的重要因素。不考虑 ZY01,当 MPs 用量为 1 %(重量比)时,PE MP 处理比 PBAT MP 处理对四寄主细菌的选择性更强,而当 MPs 用量为 0.5 % 和 2 %(重量比)时,趋势则相反。放线菌群中的一些特定菌属与 1 类整合子-整合酶基因(intI1)密切相关,在土壤中 tet 的水平基因转移中发挥了关键作用,尤其是在 MPs 与 ZY01 共存的情况下。这项研究将有助于了解可生物降解和传统 MPs 作为热点如何影响土壤中抗生素和 ARGs 的环境行为。
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Effects of microplastics on dissipation of oxytetracycline and its relevant resistance genes in soil without and with Serratia marcescens: Comparison between biodegradable and conventional microplastics
The biodegradable (polybutylene adipate terephthalate: PBAT) and conventional (polyethylene: PE) microplastics (MPs) at 0.5 %, 1 %, and 2 % dosages (w/w) were added into soils with and without Serratia marcescens ZY01 (ZY01, a tet-host strain) to understand their different effects on the dissipation of oxytetracycline (OTC) and tet. The results showed that the dosages of PBAT MP exhibited different inhibition degrees of OTC biodegradation in soils regardless of ZY01, while the dosages of PE MP did not change the enhancement degree of OTC biodegradation in soils without ZY01. These differences were due to the higher adsorption capacity of OTC on PBAT MP and the stronger toxicity of PBAT MP to microorganisms. Besides soil organic matter, pH and total phosphorus were important factors regulating specific tet-host bacteria in soils with MPs (e.g., the nitrogen-cycling bacteria Steroidobacter and Nitrospira) and MPs + ZY01 (e.g., the phosphorus-cycling bacteria Saccharimonadales and Haliangium), respectively. Regardless of ZY01, a stronger selective harboring of tet-host bacteria in PE MP treatments than PBAT MP treatments was observed at the MP dosage of 1 % (w/w), while the opposite trend was true at the MP dosages of 0.5 % and 2 % (w/w). Some specific genera belonging to Actinobacteriota strongly associated with the class 1 integron-integrase gene (intI1), playing a critical role in the horizontal gene transfer of tet in soils especially for the co-existence of MPs and ZY01. This study will be helpful for understanding on how biodegradable and conventional MPs as hotspots affect the environmental behavior of antibiotics and ARGs in soil.
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来源期刊
CiteScore
12.10
自引率
5.90%
发文量
1234
审稿时长
88 days
期刊介绍: Ecotoxicology and Environmental Safety is a multi-disciplinary journal that focuses on understanding the exposure and effects of environmental contamination on organisms including human health. The scope of the journal covers three main themes. The topics within these themes, indicated below, include (but are not limited to) the following: Ecotoxicology、Environmental Chemistry、Environmental Safety etc.
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