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Bioavailability of Soil-Sorbed Tetracycline to Escherichia coli under Unsaturated Conditions

机译：在不饱和条件下土壤吸附的四环素对大肠杆菌的生物利用度

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摘要

Increasing concentrations of anthropogenic antibiotics in soils are partly responsible for the proliferation of bacterial antibiotic resistance. However, little is known about how soil-sorbed antibiotics exert selective pressure on bacteria in unsaturated soils. This study investigated the bioavailability of tetracycline sorbed on three soils (Webster clay loam, Capac sandy clay loam, and Oshtemo loamy sand) to a fluorescent Escherichia coli bioreporter under unsaturated conditions using agar diffusion assay, microscopic visualization, and model simulation. Tetracycline sorbed on the soils could be desorbed and become bioavailable to the E. coli cells at matric water potentials of -2.95 to -13.75 kPa. Bright fluorescent rings were formed around the tetracycline-loaded soils on the unsaturated agar surfaces, likely due to radial diffusion of tetracycline desorbed from the soils, tetracycline uptake by the E. coli cells, and its inhibition on E. coli growth, which was supported by the model simulation. The bioavailability of soil-sorbed tetracycline was much higher for the Oshtemo soil, probably due to faster diffusion of tetracycline in coarse-textured soils. Decreased bioavailability of soil-sorbed tetracycline at lower soil water potential likely resulted from reduced tetracycline diffusion in soil pore water at smaller matric potential and/or suppressed tetracycline uptake by E. coli at lower osmotic potential Therefore, soil-sorbed tetracycline could still exert selective pressure on the exposed bacteria, which was influenced by soil physical processes controlled by soil texture and soil water potential.
机译：土壤中人为抗生素的浓度增加是造成细菌抗生素耐药性扩散的部分原因。但是，对于土壤吸附的抗生素如何对不饱和土壤中的细菌施加选择性压力知之甚少。这项研究使用琼脂扩散分析，显微镜观察和模型模拟研究了吸附在三种土壤（韦伯斯特壤土，Capac砂质壤土和Oshtemo壤土）上的四环素对荧光大肠杆菌生物报告物的生物利用度。吸附在土壤上的四环素可以被解吸，并在基质水势为-2.95至-13.75 kPa时对大肠杆菌细胞具有生物利用度。支持四环素的土壤在不饱和琼脂表面上形成明亮的荧光环，这可能是由于从土壤中解吸的四环素的径向扩散，大肠杆菌细胞对四环素的吸收及其对大肠杆菌生长的抑制所致。通过模型仿真。在Oshtemo土壤中，土壤吸附的四环素的生物利用度要高得多，这可能是由于四环素在粗糙结构土壤中的扩散更快。在较低土壤水势下土壤吸附的四环素的生物利用度降低可能是由于在较低基质势下四环素在土壤孔隙水中的扩散减少和/或在较低渗透势下抑制了大肠杆菌对四环素的吸收，因此，土壤吸附四环素仍然可以发挥选择性暴露细菌的压力，这受到土壤质地和土壤水势控制的土壤物理过程的影响。

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  • 来源
    《Environmental Science & Technology》 |2017年第11期|6165-6173|共9页
  • 作者

    Zeyou Chen; Wei Zhang; Gang Wang; Yingjie Zhang; Yanzheng Gao; Stephen A Boyd; Brian J. Teppen; James M. Tiedje; Dongqiang Zhu; Hui Li;

  • 作者单位

    Institute of Organic Contaminant Control and Soil Remediation, College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China,Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824, United States;

    Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824, United States;

    Department of Water and Soil Sciences, China Agricultural University, Beijing 100193, China;

    Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824, United States;

    Institute of Organic Contaminant Control and Soil Remediation, College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China;

    Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824, United States;

    Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824, United States;

    Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824, United States;

    School of Urban and Environmental Sciences, Peking University, Beijing 100871, China;

    Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, Michigan 48824, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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