Interaction Between Root Exudates and PFOS Mobility: Effects on Rhizosphere Microbial Health in Wetland Ecosystems

IF 7.6 2区环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES

Environmental Pollution Pub Date : 2024-11-16 DOI:10.1016/j.envpol.2024.125324

Bianhe Lu, Peifang Wang, Yueming Zhu, Jing Hu, Jin Qian, Yuanyuan Huang, Junwei Shen, Sijing Tang, Yin Liu

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Abstract

Perfluorooctanesulfonate (PFOS), a persistent organic pollutant, poses significant ecological risks. This study investigates the effects of PFOS on rhizosphere microbial communities of two wetland plants, Lythrum salicaria (LS) and Phragmites communis (PC). We conducted microcosm experiments to analyze the physiological status of soil microbes under varying PFOS concentrations and examined the role of root exudates in modulating PFOS mobility. Flow cytometry and soil respiration measurements revealed that PFOS exposure increased microbial mortality, with differential impacts observed between LS and PC rhizospheres. LS root exudates intensified microbial stress, whereas PC exudates mitigated PFOS toxicity. Thin-layer chromatography indicated that LS exudates decreased PFOS mobility, leading to higher local concentrations and increased microbial toxicity, while PC exudates enhanced PFOS mobility, reducing its local impact. Fourier-transform infrared spectroscopy and excitation-emission matrix fluorescence spectroscopy of root exudates identified compositional shifts under PFOS stress, highlighting distinct defense strategies in LS and PC. These findings underscore the importance of plant-microbe interactions and root exudate composition in determining microbial resilience to PFOS contamination.

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根系渗出物与全氟辛烷磺酸流动性之间的相互作用：对湿地生态系统根圈微生物健康的影响

全氟辛烷磺酸（PFOS）是一种持久性有机污染物，对生态环境具有重大风险。本研究调查了全氟辛烷磺酸对两种湿地植物--柳叶菜（Lythrum salicaria，LS）和葭（Phragmites communis，PC）--根瘤微生物群落的影响。我们进行了微观世界实验，分析了不同全氟辛烷磺酸浓度下土壤微生物的生理状态，并研究了根部渗出物在调节全氟辛烷磺酸流动性中的作用。流式细胞仪和土壤呼吸测量结果表明，接触全氟辛烷磺酸会增加微生物的死亡率，在 LS 和 PC 根瘤之间观察到不同的影响。LS 根系渗出物加剧了微生物的压力，而 PC 渗出物则减轻了 PFOS 的毒性。薄层色谱法表明，LS渗出物降低了全氟辛烷磺酸的流动性，导致局部浓度升高，增加了微生物毒性，而PC渗出物增强了全氟辛烷磺酸的流动性，降低了其对局部的影响。根部渗出物的傅立叶变换红外光谱和激发-发射矩阵荧光光谱确定了 PFOS 胁迫下的成分变化，凸显了 LS 和 PC 中不同的防御策略。这些发现强调了植物与微生物之间的相互作用以及根部渗出物成分在决定微生物对全氟辛烷磺酸污染的适应能力方面的重要性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental Pollution 环境科学-环境科学

CiteScore

16.00

自引率

6.70%

发文量

2082

审稿时长

2.9 months

期刊介绍： Environmental Pollution is an international peer-reviewed journal that publishes high-quality research papers and review articles covering all aspects of environmental pollution and its impacts on ecosystems and human health. Subject areas include, but are not limited to: • Sources and occurrences of pollutants that are clearly defined and measured in environmental compartments, food and food-related items, and human bodies; • Interlinks between contaminant exposure and biological, ecological, and human health effects, including those of climate change; • Contaminants of emerging concerns (including but not limited to antibiotic resistant microorganisms or genes, microplastics/nanoplastics, electronic wastes, light, and noise) and/or their biological, ecological, or human health effects; • Laboratory and field studies on the remediation/mitigation of environmental pollution via new techniques and with clear links to biological, ecological, or human health effects; • Modeling of pollution processes, patterns, or trends that is of clear environmental and/or human health interest; • New techniques that measure and examine environmental occurrences, transport, behavior, and effects of pollutants within the environment or the laboratory, provided that they can be clearly used to address problems within regional or global environmental compartments.