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Yu Y, Trottmann NF, Schärer MR, Fenner K, Robinson SL. Substrate promiscuity of xenobiotic-transforming hydrolases from stream biofilms impacted by treated wastewater. WATER RESEARCH 2024; 256:121593. [PMID: 38631239 DOI: 10.1016/j.watres.2024.121593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2023] [Revised: 04/07/2024] [Accepted: 04/08/2024] [Indexed: 04/19/2024]
Abstract
Organic contaminants enter aquatic ecosystems from various sources, including wastewater treatment plant effluent. Freshwater biofilms play a major role in the removal of organic contaminants from receiving water bodies, but knowledge of the molecular mechanisms driving contaminant biotransformations in complex stream biofilm (periphyton) communities remains limited. Previously, we demonstrated that biofilms in experimental flume systems grown at higher ratios of treated wastewater (WW) to stream water displayed an increased biotransformation potential for a number of organic contaminants. We identified a positive correlation between WW percentage and biofilm biotransformation rates for the widely-used insect repellent, N,N-diethyl-meta-toluamide (DEET) and a number of other wastewater-borne contaminants with hydrolyzable moieties. Here, we conducted deep shotgun sequencing of flume biofilms and identified a positive correlation between WW percentage and metagenomic read abundances of DEET hydrolase (DH) homologs. To test the causality of this association, we constructed a targeted metagenomic library of DH homologs from flume biofilms. We screened our complete metagenomic library for activity with four different substrates, including DEET, and a subset thereof with 183 WW-related organic compounds. The majority of active hydrolases in the metagenomic library preferred aliphatic and aromatic ester substrates while, remarkably, only a single reference enzyme was capable of DEET hydrolysis. Of the 626 total enzyme-substrate combinations tested, approximately 5% were active enzyme-substrate pairs. Metagenomic DH family homologs revealed a broad substrate promiscuity spanning 22 different compounds when summed across all enzymes tested. We biochemically characterized the most promiscuous and active enzymes identified based on metagenomic analysis from uncultivated Rhodospirillaceae and Planctomycetaceae. In addition to characterizing new DH family enzymes, we exemplified a framework for linking metagenome-guided hypothesis generation with experimental validation. Overall, this study expands the scope of known enzymatic contaminant biotransformations for metagenomic hydrolases from WW-receiving stream biofilm communities.
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Affiliation(s)
- Yaochun Yu
- Department of Environmental Chemistry, Swiss Federal Institute of Aquatic Science and Technology (Eawag), 8600 Dübendorf, Switzerland
| | - Niklas Ferenc Trottmann
- Department of Environmental Microbiology, Swiss Federal Institute of Aquatic Science and Technology (Eawag), 8600 Dübendorf, Switzerland
| | - Milo R Schärer
- Department of Environmental Microbiology, Swiss Federal Institute of Aquatic Science and Technology (Eawag), 8600 Dübendorf, Switzerland
| | - Kathrin Fenner
- Department of Environmental Chemistry, Swiss Federal Institute of Aquatic Science and Technology (Eawag), 8600 Dübendorf, Switzerland; Department of Chemistry, University of Zürich, 8057 Zürich, Switzerland
| | - Serina L Robinson
- Department of Environmental Microbiology, Swiss Federal Institute of Aquatic Science and Technology (Eawag), 8600 Dübendorf, Switzerland.
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Izma G, Raby M, Prosser R, Rooney R. Urban-use pesticides in stormwater ponds and their accumulation in biofilms. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 918:170534. [PMID: 38301793 DOI: 10.1016/j.scitotenv.2024.170534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 01/24/2024] [Accepted: 01/26/2024] [Indexed: 02/03/2024]
Abstract
Stormwater ponds frequently receive urban runoff, increasing the likelihood of pesticide contamination. Biofilms growing in surface waters of these ponds are known to accumulate a range of aquatic contaminants, paradoxically providing both water purification services and potentially posing a threat to urban wildlife. Thus, sampling biofilms in stormwater ponds may be a critical and biologically relevant tool for characterizing pesticide contamination and toxicity in urban environments. Here, we aimed to investigate pesticide occurrences at 21 stormwater ponds in Brampton, ON, one of Canada's fastest growing municipalities, and quantify their accumulation in biofilm. Over nine weeks, we collected time-integrated composite water and biofilm samples for analysis of ∼500 current-use and legacy pesticides. Thirty-two pesticide compounds were detected across both matrices, with 2,4-D, MCPA, MCPP, azoxystrobin, bentazon, triclopyr, and diuron having near-ubiquitous occurrences. Several compounds not typically monitored in pesticide suites (e.g., melamine and nicotine) were also detected, but only in biofilms. Overall, 56 % of analytes detected in biofilms were not found in water samples, indicating traditional pesticide monitoring practices fail to capture all exposure routes, as even when pesticides are below detection levels in water, organisms may still be exposed via dietary pathways. Calculated bioconcentration factors ranged from 4.2 to 1275 and were not predicted by standard pesticide physicochemical properties. Monitoring biofilms provides a sensitive and comprehensive supplement to water sampling for pesticide quantification in urban areas, and identifying pesticide occurrences in stormwater could improve source-tracking efforts in the future. Further research is needed to understand the mechanisms driving pesticide accumulation, to investigate toxicity risks associated with pesticide-contaminated biofilm, and to evaluate whether pesticide accumulation in stormwater pond biofilms represents a route through which contaminants are mobilized into the surrounding terrestrial and downstream aquatic environments.
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Affiliation(s)
- Gab Izma
- Department of Biology, University of Waterloo, Waterloo, ON, Canada
| | - Melanie Raby
- Ontario Ministry of Environment, Conservation, and Parks, Etobicoke, ON, Canada
| | - Ryan Prosser
- School of Environmental Science, University of Guelph, Guelph, ON, Canada
| | - Rebecca Rooney
- Department of Biology, University of Waterloo, Waterloo, ON, Canada.
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3
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Morin S, Artigas J. Twenty Years of Research in Ecosystem Functions in Aquatic Microbial Ecotoxicology. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2023; 42:1867-1888. [PMID: 37401851 DOI: 10.1002/etc.5708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 12/20/2022] [Accepted: 06/27/2023] [Indexed: 07/05/2023]
Abstract
One of the major threats to freshwater biodiversity is water pollution including excessive loads of nutrients, pesticides, industrial chemicals, and/or emerging contaminants. The widespread use of organic pesticides for agricultural and nonagricultural (industry, gardening, etc.) purposes has resulted in the presence of their residues in various environments, including surface waters. However, the contribution of pesticides to the deterioration of freshwater ecosystems (i.e., biodiversity decline and ecosystem functions impairment) remains uncertain. Once in the aquatic environment, pesticides and their metabolites can interact with microbial communities, causing undesirable effects. The existing legislation on ecological quality assessment of water bodies in Europe is based on water chemical quality and biological indicator species (Water Framework Directive, Pesticides Directive), while biological functions are not yet included in monitoring programs. In the present literature review, we analyze 20 years (2000-2020) of research on ecological functions provided by microorganisms in aquatic ecosystems. We describe the set of ecosystem functions investigated in these studies and the range of endpoints used to establish causal relationships between pesticide exposure and microbial responses. We focus on studies addressing the effects of pesticides at environmentally realistic concentrations and at the microbial community level to inform the ecological relevance of the ecotoxicological assessment. Our literature review highlights that most studies were performed using benthic freshwater organisms and that autotrophic and heterotrophic communities are most often studied separately, usually testing the pesticides that target the main microbial component (i.e., herbicides for autotrophs and fungicides for heterotrophs). Overall, most studies demonstrate deleterious impacts on the functions studied, but our review points to the following shortcomings: (1) the nonsystematic analysis of microbial functions supporting aquatic ecosystems functioning, (2) the study of ecosystem functions (i.e., nutrient cycling) via proxies (i.e., potential extracellular enzymatic activity measurements) which are sometimes disconnected from the current ecosystem functions, and (3) the lack of consideration of chronic exposures to assess the impact of, adaptations to, or recovery of aquatic microbial communities from pesticides. Environ Toxicol Chem 2023;42:1867-1888. © 2023 SETAC.
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Affiliation(s)
| | - Joan Artigas
- Laboratoire Microorganismes: Génome et Environnement, CNRS, Université Clermont Auvergne, Clermont-Ferrand, France
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4
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Pang S, Lin Z, Chen WJ, Chen SF, Huang Y, Lei Q, Bhatt P, Mishra S, Chen S, Wang H. High-efficiency degradation of methomyl by the novel bacterial consortium MF0904: Performance, structural analysis, metabolic pathways, and environmental bioremediation. JOURNAL OF HAZARDOUS MATERIALS 2023; 452:131287. [PMID: 37003005 DOI: 10.1016/j.jhazmat.2023.131287] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 03/21/2023] [Accepted: 03/23/2023] [Indexed: 05/03/2023]
Abstract
Methomyl is a widely used carbamate pesticide, which has adverse biological effects and poses a serious threat to ecological environments and human health. Several bacterial isolates have been investigated for removing methomyl from environment. However, low degradation efficiency and poor environmental adaptability of pure cultures severely limits their potential for bioremediation of methomyl-contaminated environment. Here, a novel microbial consortium, MF0904, can degrade 100% of 25 mg/L methomyl within 96 h, an efficiency higher than that of any other consortia or pure microbes reported so far. The sequencing analysis revealed that Pandoraea, Stenotrophomonas and Paracoccus were the predominant members of MF0904 in the degradation process, suggesting that these genera might play pivotal roles in methomyl biodegradation. Moreover, five new metabolites including ethanamine, 1,2-dimethyldisulfane, 2-hydroxyacetonitrile, N-hydroxyacetamide, and acetaldehyde were identified using gas chromatography-mass spectrometry, indicating that methomyl could be degraded firstly by hydrolysis of its ester bond, followed by cleavage of the C-S ring and subsequent metabolism. Furthermore, MF0904 can successfully colonize and substantially enhance methomyl degradation in different soils, with complete degradation of 25 mg/L methomyl within 96 and 72 h in sterile and nonsterile soil, respectively. Together, the discovery of microbial consortium MF0904 fills a gap in the synergistic metabolism of methomyl at the community level and provides a potential candidate for bioremediation applications.
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Affiliation(s)
- Shimei Pang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China; School of Medicine, Southern University of Science and Technology, Shenzhen 518055, China
| | - Ziqiu Lin
- The Hong Kong University of Science and Technology, Hong Kong, China
| | - Wen-Juan Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
| | - Shao-Fang Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
| | - Yaohua Huang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
| | - Qiqi Lei
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China
| | - Pankaj Bhatt
- Department of Agricultural & Biological Engineering, Purdue University, West Lafayette 47906, USA
| | - Sandhya Mishra
- Environmental Technologies Division, CSIR-National Botanical Research Institute, Rana Pratap Marg, Lucknow 226001, India
| | - Shaohua Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China.
| | - Huishan Wang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, College of Plant Protection, South China Agricultural University, Guangzhou 510642, China.
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Abdelhak S, Menard Y, Artigas J. Effects of global change on the ability of stream biofilm to dissipate the herbicide glyphosate. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2023; 324:121406. [PMID: 36893978 DOI: 10.1016/j.envpol.2023.121406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 02/21/2023] [Accepted: 03/05/2023] [Indexed: 06/18/2023]
Abstract
The herbicide glyphosate is contaminating a large number of freshwater ecosystems worldwide and its fate and effects remains uncertain in light of the effects of global change. The present study examines how variations in water temperature and light availability relative to global change affect the ability of stream biofilms to degrade the herbicide glyphosate. Biofilms were exposed in microcosms to two levels of water temperature simulating global warming (Ambient = 19-22 °C and Warm = 21-24 °C) and three levels of light representative of riparian habitat destruction due to land use change (Dark = 0, Intermediate = 600, High = 1200 μmol photons m-2 s-1). Biofilms were acclimated to six different experimental treatments, namely i) ambient temperature without light (AMB_D), ii) ambient temperature and intermediate light (AMB_IL), iii) ambient temperature and high light (AMB_HL), iv) warm temperature without light (WARM_D), v) warm temperature and intermediate light (WARM_IL) and vi) warm temperature and high light (WARM_HL). The ability of biofilms to degrade 50 μg L-1 of glyphosate was tested. Results showed that water temperature increase, but not light availability increase, significantly increased aminomethyl phosphonic acid (AMPA) production by biofilms. However, the combined increase of temperature and light generated the shortest time to dissipate half of the glyphosate supplied and/or half of the maximum AMPA produced (6.4 and 5.4 days, respectively) by biofilms. Despite light had a major effect in modulating biofilm structural and functional descriptors, the response of certain descriptors (i. e. chlorophyll-a concentration, bacterial density and diversity, nutrient content and PHO activity) to light availability increase depended on water temperature. Specifically, the biofilms in the WARM_HL treatment displayed the highest Glucosidase: Peptidase and Glucosidase: Phosphatase enzyme activity ratios and the lowest biomass C: N molar ratios compared to the other treatments. According to these results, warmer temperatures and high light availability could have been exacerbating the decomposition of organic C compounds in biofilms, including the use of glyphosate as a C source for microbial heterotrophs. This study shows that ecoenzymatic stoichiometry and xenobiotic biodegradation approaches can be combined to better understand the functioning of biofilms in pesticide-polluted streams.
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Affiliation(s)
- Selma Abdelhak
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement (LMGE), F-63000, Clermont-Ferrand, France
| | - Yoann Menard
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement (LMGE), F-63000, Clermont-Ferrand, France
| | - Joan Artigas
- Université Clermont Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement (LMGE), F-63000, Clermont-Ferrand, France.
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6
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Latag GV, Nakamura T, Palai D, Mondarte EAQ, Hayashi T. Investigation of Three-Dimensional Bacterial Adhesion Manner on Model Organic Surfaces Using Quartz Crystal Microbalance with Energy Dissipation Monitoring. ACS APPLIED BIO MATERIALS 2023; 6:1185-1194. [PMID: 36802460 PMCID: PMC10031553 DOI: 10.1021/acsabm.2c01012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
Abstract
Bacterial biofilms reduce the performance and efficiency of biomedical and industrial devices. The initial step in forming bacterial biofilms is the weak and reversible attachment of the bacterial cells onto the surface. This is followed by bond maturation and secretion of polymeric substances, which initiate irreversible biofilm formation, resulting in stable biofilms. This implies that understanding the initial reversible stage of the adhesion process is crucial to prevent bacterial biofilm formation. In this study, we analyzed the adhesion processes of E. coli on self-assembled monolayers (SAMs) with different terminal groups using optical microscopy and quartz crystal microbalance with energy dissipation (QCM-D) monitoring. We found that a considerable number of bacterial cells adhere to hydrophobic (methyl-terminated) and hydrophilic protein-adsorbing (amine- and carboxy-terminated) SAMs forming dense bacterial adlayers while attaching weakly to hydrophilic protein-resisting SAMs [oligo(ethylene glycol) (OEG) and sulfobetaine (SB)], forming sparse but dissipative bacterial adlayers. Moreover, we observed positive shifts in the resonant frequency for the hydrophilic protein-resisting SAMs at high overtone numbers, suggesting how bacterial cells cling to the surface using their appendages as explained by the coupled-resonator model. By exploiting the differences in the acoustic wave penetration depths at each overtone, we estimated the distance of the bacterial cell body from different surfaces. The estimated distances provide a possible explanation for why bacterial cells tend to attach firmly to some surfaces and weakly to others. This result is correlated to the strength of the bacterium-substratum bonds at the interface. Elucidating how the bacterial cells adhere to different surface chemistries can be a suitable guide in identifying surfaces with a more significant probability of contamination by bacterial biofilms and designing bacteria-resistant surfaces and coatings with excellent bacterial antifouling characteristics.
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Affiliation(s)
- Glenn Villena Latag
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 4259 Nagatsuta-Cho, Midori-ku, Yokohama, Kanagawa 226-8502, Japan
| | - Taichi Nakamura
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 4259 Nagatsuta-Cho, Midori-ku, Yokohama, Kanagawa 226-8502, Japan
| | - Debabrata Palai
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 4259 Nagatsuta-Cho, Midori-ku, Yokohama, Kanagawa 226-8502, Japan
| | - Evan Angelo Quimada Mondarte
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 4259 Nagatsuta-Cho, Midori-ku, Yokohama, Kanagawa 226-8502, Japan
- School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798, Singapore
| | - Tomohiro Hayashi
- Department of Materials Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 4259 Nagatsuta-Cho, Midori-ku, Yokohama, Kanagawa 226-8502, Japan
- The Institute for Solid State Physics, The University of Tokyo, 5-1-5, Kashiwanoha, Kashiwa, Chiba 277-0882, Japan
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7
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Mishra S, Huang Y, Li J, Wu X, Zhou Z, Lei Q, Bhatt P, Chen S. Biofilm-mediated bioremediation is a powerful tool for the removal of environmental pollutants. CHEMOSPHERE 2022; 294:133609. [PMID: 35051518 DOI: 10.1016/j.chemosphere.2022.133609] [Citation(s) in RCA: 55] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 01/09/2022] [Accepted: 01/11/2022] [Indexed: 06/14/2023]
Abstract
Biofilm-mediated bioremediation is an attractive approach for the elimination of environmental pollutants, because of its wide adaptability, biomass, and excellent capacity to absorb, immobilize, or degrade contaminants. Biofilms are assemblages of individual or mixed microbial cells adhering to a living or non-living surface in an aqueous environment. Biofilm-forming microorganisms have excellent survival under exposure to harsh environmental stressors, can compete for nutrients, exhibit greater tolerance to pollutants compared to free-floating planktonic cells, and provide a protective environment for cells. Biofilm communities are thus capable of sorption and metabolization of organic pollutants and heavy metals through a well-controlled expression pattern of genes governed by quorum sensing. The involvement of quorum sensing and chemotaxis in biofilms can enhance the bioremediation kinetics with the help of signaling molecules, the transfer of genetic material, and metabolites. This review provides in-depth knowledge of the process of biofilm formation in microorganisms, their regulatory mechanisms of interaction, and their importance and application as powerful bioremediation agents in the biodegradation of environmental pollutants, including hydrocarbons, pesticides, and heavy metals.
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Affiliation(s)
- Sandhya Mishra
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
| | - Yaohua Huang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
| | - Jiayi Li
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
| | - Xiaozhen Wu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
| | - Zhe Zhou
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
| | - Qiqi Lei
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
| | - Pankaj Bhatt
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
| | - Shaohua Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Provincial Key Laboratory of Agricultural & Rural Pollution Abatement and Environmental Safety, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China.
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8
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Ahmad S, Ahmad HW, Bhatt P. Microbial adaptation and impact into the pesticide's degradation. Arch Microbiol 2022; 204:288. [PMID: 35482163 DOI: 10.1007/s00203-022-02899-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Revised: 03/13/2022] [Accepted: 04/05/2022] [Indexed: 12/22/2022]
Abstract
The imprudent use of agrochemicals to control agriculture and household pests is unsafe for the environment. Hence, to protect the environment and diversity of living organisms, the degradation of pesticides has received widespread attention. There are different physical, chemical, and biological methods used to remediate pesticides in contaminated sites. Compared to other methods, biological approaches and their associated techniques are more effective, less expensive and eco-friendly. Microbes secrete several enzymes that can attach pesticides, break down organic compounds, and then convert toxic substances into carbon and water. Thus, there is a lack of knowledge regarding the functional genes and genomic potential of microbial species for the removal of emerging pollutants. Here we address the knowledge gaps by highlighting systematic biology and their role in adaptation of microbial species from agricultural soils with a history of pesticide usage and profiling shifts in functional genes and microbial taxa abundance. Moreover, by co-metabolism, the microbial species fulfill their nutritional requirements and perform more efficiently than single microbial-free cells. But in an open environment, free cells of microbes are not much prominent in the degradation process due to environmental conditions, incompatibilities with mechanical equipment and difficulties associated with evenly distributing inoculum through the agroecosystem. This review highlights emerging techniques involving the removal of pesticides in a field-scale environment like immobilization, biobed, biocomposites, biochar, biofilms, and bioreactors. In these techniques, different microbial cells, enzymes, natural fibers, and strains are used for the effective biodegradation of xenobiotic pesticides.
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Affiliation(s)
- Sajjad Ahmad
- Key Laboratory of Integrated Pest Management of Crop in South China, Ministry of Agriculture and Rural Affairs; Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou, 510642, People's Republic of China
| | - Hafiz Waqas Ahmad
- Department of Food Engineering, Faculty of Agricultural Engineering and Technology, University of Agriculture, Faisalabad, 38000, Pakistan
| | - Pankaj Bhatt
- Department of Agricultural and Biological Engineering, Purdue University, West Lafayette, IN, 47906, USA.
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9
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Jiang Z, Qu L, Song G, Liu J, Zhong G. The Potential Binding Interaction and Hydrolytic Mechanism of Carbaryl with the Novel Esterase PchA in Pseudomonas sp. PS21. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2022; 70:2136-2145. [PMID: 35147028 DOI: 10.1021/acs.jafc.1c06465] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Microbial bioremediation is a very potent and eco-friendly approach to alleviate pesticide pollution in agricultural ecosystems, and hydrolase is an effective element for contaminant degradation. In the present study, a novel Mn2+-dependent esterase, PchA, that efficiently hydrolyzes carbamate pesticides with aromatic structures was identified from Pseudomonas sp. PS21. The hydrolytic activity was confirmed to be related closely to the core catalytic domain, which consists of six residues. The crucial residues indirectly stabilized the position of carbaryl via chelating Mn2+ according to the binding model clarified by molecular simulations, and the additional hydrophobic interactions between carbaryl with several hydrophobic residues also stabilized the binding conformation. The residue Glu398, by serving as the general base, might activate a water molecule and facilitate PchA catalysis. This work offers valuable insights into the binding interaction and hydrolytic mechanism of carbaryl with the hydrolase PchA and will be crucial to designing strategies leading to the protein variants that are capable of degrading related contaminants.
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Affiliation(s)
- Zhiyan Jiang
- Key Laboratory of Integrated Pest Management of Crop in South China, Ministry of Agriculture and Rural Affairs, Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, P.R. China
| | - Liwen Qu
- Key Laboratory of Integrated Pest Management of Crop in South China, Ministry of Agriculture and Rural Affairs, Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, P.R. China
| | - Gaopeng Song
- College of Materials and Energy, South China Agricultural University, Guangzhou 510642, P.R. China
| | - Jie Liu
- Key Laboratory of Integrated Pest Management of Crop in South China, Ministry of Agriculture and Rural Affairs, Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, P.R. China
| | - Guohua Zhong
- Key Laboratory of Integrated Pest Management of Crop in South China, Ministry of Agriculture and Rural Affairs, Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, South China Agricultural University, Guangzhou 510642, P.R. China
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10
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Monga D, Kaur P, Singh B. Microbe mediated remediation of dyes, explosive waste and polyaromatic hydrocarbons, pesticides and pharmaceuticals. CURRENT RESEARCH IN MICROBIAL SCIENCES 2022; 3:100092. [PMID: 35005657 PMCID: PMC8717453 DOI: 10.1016/j.crmicr.2021.100092] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 11/16/2021] [Accepted: 12/08/2021] [Indexed: 01/30/2023] Open
Abstract
Environmental pollutants dyes, pesticides, pharmaceuticals, explosive waste and polyaromatic hydrocarbons. Environmental pollutants toxicity. Possible microbial biodegradation pathways of environmental pollutants.
Industrialization and human activities have led to serious effects on environment. With the progress taking place in the biodegradation field, it is important to summarize the latest advancement. In this review, we intend to provide insights on the recent progress on the biodegradation of environmental contaminants such as dyes, pesticides, pharmaceuticals, explosive waste and polyaromatic hydrocarbons by microorganisms. Along with the biodegradation of environmental contaminants, toxicity effects have also been discussed.
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Negrete-Bolagay D, Zamora-Ledezma C, Chuya-Sumba C, De Sousa FB, Whitehead D, Alexis F, Guerrero VH. Persistent organic pollutants: The trade-off between potential risks and sustainable remediation methods. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 300:113737. [PMID: 34536739 DOI: 10.1016/j.jenvman.2021.113737] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 09/08/2021] [Accepted: 09/09/2021] [Indexed: 06/13/2023]
Abstract
Persistent Organic Pollutants (POPs) have become a very serious issue for the environment because of their toxicity, resistance to conventional degradation mechanisms, and capacity to bioconcentrate, bioaccumulate and biomagnify. In this review article, the safety, regulatory, and remediation aspects of POPs including aromatic, chlorinated, pesticides, brominated, and fluorinated compounds, are discussed. Industrial and agricultural activities are identified as the main sources of these harmful chemicals, which are released to air, soil and water, impacting on social and economic development of society at a global scale. The main types of POPs are presented, illustrating their effects on wildlife and human beings, as well as the ways in which they contaminate the food chain. Some of the most promising and innovative technologies developed for the removal of POPs from water are discussed, contrasting their advantages and disadvantages with those of more conventional treatment processes. The promising methods presented in this work include bioremediation, advanced oxidation, ionizing radiation, and nanotechnology. Finally, some alternatives to define more efficient approaches to overcome the impacts that POPs cause in the hydric sources are pointed out. These alternatives include the formulation of policies, regulations and custom-made legislation for controlling the use of these pollutants.
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Affiliation(s)
- Daniela Negrete-Bolagay
- School of Biological Sciences and Engineering, Yachay Tech University, 100119, Urcuquí, Ecuador.
| | - Camilo Zamora-Ledezma
- Tissue Regeneration and Repair: Orthobiology, Biomaterials & Tissue Engineering Research Group, UCAM - Universidad Católica de Murcia, Avda. Los Jerónimos 135, Guadalupe, 30107, Murcia, Spain.
| | - Cristina Chuya-Sumba
- School of Biological Sciences and Engineering, Yachay Tech University, 100119, Urcuquí, Ecuador.
| | - Frederico B De Sousa
- Laboratório de Sistemas Poliméricos e Supramoleculares, Physics and Chemistry Institute, Federal University of Itajubá, 37500-903, Itajubá, Brazil.
| | - Daniel Whitehead
- Department of Chemistry, Clemson University, Clemson, SC, 29634, USA.
| | - Frank Alexis
- School of Biological Sciences and Engineering, Yachay Tech University, 100119, Urcuquí, Ecuador.
| | - Victor H Guerrero
- Department of Materials, Escuela Politécnica Nacional, Ladrón de Guevara E11-253, Quito, 170525, Ecuador.
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Álvarez-Ruiz R, Hawker DW, Mueller JF, Gallen M, Kaserzon S, Picó Y, McLachlan MS. Postflood Monitoring in a Subtropical Estuary and Benchmarking with PFASs Allows Measurement of Chemical Persistence on the Scale of Months. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:14607-14616. [PMID: 34664504 DOI: 10.1021/acs.est.1c02263] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Measurements of chemical persistence in natural environments can provide insight into behavior not easily replicated in laboratory studies. However, it is difficult to find environmental situations suitable for such measurements, particularly for substances with half-lives exceeding several weeks. The objective of this study was to demonstrate that a strategic postflood monitoring campaign can be used to quantify transformation half-lives on the scale of months in a real aquatic system. Water samples were collected in the upper Brisbane River estuary on 36 occasions over 37 weeks and analyzed for 127 pharmaceuticals and personal care products (PPCPs), pesticides, and perfluoroalkyl substances (PFASs). High quality time trend data were obtained for 41 substances. For many of these, data on the input of a wastewater treatment plant to the upper estuary were also obtained. A mass balance model of the estuary stretch was formulated and parametrized using PFASs as persistent benchmarking chemicals. Transformation half-life estimates were obtained for 10 PPCPs and 7 pesticides ranging from 18 to 260 days. Furthermore, insight was obtained into dominant transformation processes as well as the magnitude of chemical inputs to the estuary and their sources. The approach developed shows that under certain conditions, estuaries can be used to quantify the persistence of organic contaminants with half-lives of the order of several months.
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Affiliation(s)
- Rodrigo Álvarez-Ruiz
- Food and Environmental Safety Research Group (SAMA-UV), Desertification Research Centre (CIDE-UV, GV, CSIC), Moncada-Naquera Road km 4.5, 46113 Moncada, Valencia Spain
- The University of Queensland, Queensland Alliance for Environmental Health Sciences (QAEHS), 20 Cornwall Street, Woolloongabba, QLD 4102, Australia
| | - Darryl W Hawker
- The University of Queensland, Queensland Alliance for Environmental Health Sciences (QAEHS), 20 Cornwall Street, Woolloongabba, QLD 4102, Australia
- Griffith School of Environment and Science, Griffith University, Nathan, QLD 4111, Australia
| | - Jochen F Mueller
- The University of Queensland, Queensland Alliance for Environmental Health Sciences (QAEHS), 20 Cornwall Street, Woolloongabba, QLD 4102, Australia
| | - Michael Gallen
- The University of Queensland, Queensland Alliance for Environmental Health Sciences (QAEHS), 20 Cornwall Street, Woolloongabba, QLD 4102, Australia
| | - Sarit Kaserzon
- The University of Queensland, Queensland Alliance for Environmental Health Sciences (QAEHS), 20 Cornwall Street, Woolloongabba, QLD 4102, Australia
| | - Yolanda Picó
- Food and Environmental Safety Research Group (SAMA-UV), Desertification Research Centre (CIDE-UV, GV, CSIC), Moncada-Naquera Road km 4.5, 46113 Moncada, Valencia Spain
| | - Michael S McLachlan
- Department of Environmental Science (ACES), Stockholm University, Stockholm SE-106 91, Sweden
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Rossi F, Carles L, Donnadieu F, Batisson I, Artigas J. Glyphosate-degrading behavior of five bacterial strains isolated from stream biofilms. JOURNAL OF HAZARDOUS MATERIALS 2021; 420:126651. [PMID: 34329075 DOI: 10.1016/j.jhazmat.2021.126651] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/28/2020] [Revised: 07/02/2021] [Accepted: 07/13/2021] [Indexed: 06/13/2023]
Abstract
The present study investigates the individual degrading behavior of bacterial strains isolated from glyphosate-degrading stream biofilms. In this aim, biofilms were subjected to enrichment experiments using glyphosate or its metabolite AMPA (aminomethyl phosphonic acid) as the sole phosphorus source. Five bacterial strains were isolated and taxonomically affiliated to Ensifer sp. CNII15, Acidovorax sp. CNI26, Agrobacterium tumefaciens CNI28, Novosphingobium sp. CNI35 and Ochrobactrum pituitosum CNI52. All strains were capable of completely dissipating glyphosate after 125-400 h and AMPA after 30-120 h, except for Ensifer sp. CNII15 that was not able to dissipate glyphosate but entirely dissipated AMPA after 200 h. AMPA dissipation was overall faster than glyphosate dissipation. The five strains degraded AMPA completely since formaldehyde and/or glycine accumulation was observed. During glyphosate degradation, the strain CNI26 used the C-P lyase degradation pathway since sarcosine was quantitatively produced, and C-P lyase gene expression was enhanced 30× compared to the control treatment. However, strains CNI28, CNI35 and CNI52 accumulated both formaldehyde and glycine after glyphosate transformation suggesting that both C-P lyase and/or glyphosate oxidase degradation pathways took place. Our study shows different and complementary glyphosate degradation pathways for bacteria co-existing in stream biofilms.
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Affiliation(s)
- Florent Rossi
- Université Clermont-Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement, F-63000 Clermont-Ferrand, France
| | - Louis Carles
- Department of Environmental Toxicology (Utox), Swiss Federal Institute of Aquatic Science and Technology (Eawag), Dübendorf, Switzerland
| | - Florence Donnadieu
- Université Clermont-Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement, F-63000 Clermont-Ferrand, France
| | - Isabelle Batisson
- Université Clermont-Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement, F-63000 Clermont-Ferrand, France
| | - Joan Artigas
- Université Clermont-Auvergne, CNRS, Laboratoire Microorganismes: Génome et Environnement, F-63000 Clermont-Ferrand, France.
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Improved quantification of N-methylcarbamates combining supramolecular post-column derivatization-fluorescence detection-high performance liquid chromatography and partial least squares analysis. Microchem J 2021. [DOI: 10.1016/j.microc.2021.106550] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Mishra S, Pang S, Zhang W, Lin Z, Bhatt P, Chen S. Insights into the microbial degradation and biochemical mechanisms of carbamates. CHEMOSPHERE 2021; 279:130500. [PMID: 33892453 DOI: 10.1016/j.chemosphere.2021.130500] [Citation(s) in RCA: 53] [Impact Index Per Article: 17.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2020] [Revised: 03/01/2021] [Accepted: 04/04/2021] [Indexed: 06/12/2023]
Abstract
Carbamate compounds are commonly applied in agricultural sectors as alternative options to the recalcitrant organochlorine pesticides due to their easier breakdown and less persistent nature. However, the large-scale use of carbamates also leads to toxic environmental residues, causing severe toxicity in various living systems. The toxic effects of carbamates are due to their inhibitor activity against the acetylchlolinesterase enzyme. This enzyme is crucial for neurotransmission signaling in living beings. Hence, from the environmental point of view, the elimination of carbamates is a worldwide concern and priority. Microbial technology can be deliberated as a potential tool that can work efficiently and as an ecofriendly option for the dissipation of carbamate insecticides from contaminated environments by improving biodegradation processes via metabolic activities of microorganisms. A variety of bacterial and fungal species have been isolated and characterized and are capable of degrading a broad range of carbamates in soil and water environments. In addition, microbial carbamate hydrolase genes (mcd, cehA, cahA, cfdJ, and mcbA) were strongly implicated in the evolution of new metabolic functions and carbamate hydrolase enzymes. However, the accurate localization and appropriate functions of carbamate hydrolase enzymes/genes are very limited. To explore the information on the degradation routes of carbamates and promote the application of biodegradation, a study of molecular techniques is required to unlock insights regarding the degradation specific genes and enzymes. Hence, this review discusses the deep understanding of carbamate degradation mechanisms with microbial strains, metabolic pathways, molecular mechanisms, and their genetic basis in degradation.
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Affiliation(s)
- Sandhya Mishra
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
| | - Shimei Pang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
| | - Wenping Zhang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
| | - Ziqiu Lin
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
| | - Pankaj Bhatt
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China
| | - Shaohua Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, 510642, China; Guangdong Laboratory for Lingnan Modern Agriculture, Guangzhou, 510642, China.
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Malhotra H, Kaur S, Phale PS. Conserved Metabolic and Evolutionary Themes in Microbial Degradation of Carbamate Pesticides. Front Microbiol 2021; 12:648868. [PMID: 34305823 PMCID: PMC8292978 DOI: 10.3389/fmicb.2021.648868] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2021] [Accepted: 06/14/2021] [Indexed: 12/22/2022] Open
Abstract
Carbamate pesticides are widely used as insecticides, nematicides, acaricides, herbicides and fungicides in the agriculture, food and public health sector. However, only a minor fraction of the applied quantity reaches the target organisms. The majority of it persists in the environment, impacting the non-target biota, leading to ecological disturbance. The toxicity of these compounds to biota is mediated through cholinergic and non-cholinergic routes, thereby making their clean-up cardinal. Microbes, specifically bacteria, have adapted to the presence of these compounds by evolving degradation pathways and thus play a major role in their removal from the biosphere. Over the past few decades, various genetic, metabolic and biochemical analyses exploring carbamate degradation in bacteria have revealed certain conserved themes in metabolic pathways like the enzymatic hydrolysis of the carbamate ester or amide linkage, funnelling of aryl carbamates into respective dihydroxy aromatic intermediates, C1 metabolism and nitrogen assimilation. Further, genomic and functional analyses have provided insights on mechanisms like horizontal gene transfer and enzyme promiscuity, which drive the evolution of degradation phenotype. Compartmentalisation of metabolic pathway enzymes serves as an additional strategy that further aids in optimising the degradation efficiency. This review highlights and discusses the conclusions drawn from various analyses over the past few decades; and provides a comprehensive view of the environmental fate, toxicity, metabolic routes, related genes and enzymes as well as evolutionary mechanisms associated with the degradation of widely employed carbamate pesticides. Additionally, various strategies like application of consortia for efficient degradation, metabolic engineering and adaptive laboratory evolution, which aid in improvising remediation efficiency and overcoming the challenges associated with in situ bioremediation are discussed.
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Affiliation(s)
- Harshit Malhotra
- Department of Biosciences and Bioengineering, Indian Institute of Technology-Bombay, Mumbai, India
| | - Sukhjeet Kaur
- Department of Biosciences and Bioengineering, Indian Institute of Technology-Bombay, Mumbai, India
| | - Prashant S Phale
- Department of Biosciences and Bioengineering, Indian Institute of Technology-Bombay, Mumbai, India
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Desiante WL, Minas NS, Fenner K. Micropollutant biotransformation and bioaccumulation in natural stream biofilms. WATER RESEARCH 2021; 193:116846. [PMID: 33540344 DOI: 10.1016/j.watres.2021.116846] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 01/13/2021] [Accepted: 01/15/2021] [Indexed: 05/27/2023]
Abstract
Micropollutants are ubiquitously found in natural surface waters and pose a potential risk to aquatic organisms. Stream biofilms, consisting of bacteria, algae and other microorganisms potentially contribute to bioremediating aquatic environments by biotransforming xenobiotic substances. When investigating the potential of stream biofilms to remove micropollutants from the water column, it is important to distinguish between different fate processes, such as biotransformation, passive sorption and active bioaccumulation. However, due to the complex nature of the biofilm community and its extracellular matrix, this task is often difficult. In this study, we combined biotransformation experiments involving natural stream biofilms collected up- and downstream of wastewater treatment plant outfalls with the QuEChERS extraction method to distinguish between the different fate processes. The QuEChERS extraction proved to be a suitable method for a broad range of micropollutants (> 80% of the investigated compounds). We found that 31 out of 63 compounds were biotransformed by the biofilms, with the majority being substitution-type biotransformations, and that downstream biofilms have an increased biotransformation potential towards specific wastewater-relevant micropollutants. Overall, using the experimental and analytical strategy developed, stream biofilms were demonstrated to have a broad inherent micropollutant biotransformation potential, and to thus contribute to bioremediation and improving ecosystem health.
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Affiliation(s)
- Werner L Desiante
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland; Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, 8092 Zürich, Switzerland
| | - Nora S Minas
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland; Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, 8092 Zürich, Switzerland
| | - Kathrin Fenner
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf, Switzerland; Institute of Biogeochemistry and Pollutant Dynamics, ETH Zürich, 8092 Zürich, Switzerland; Department of Chemistry, University of Zürich, 8057 Zürich, Switzerland.
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18
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Bighiu MA, Goedkoop W. Interactions with freshwater biofilms cause rapid removal of common herbicides through degradation - evidence from microcosm studies. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2021; 23:66-72. [PMID: 33325941 DOI: 10.1039/d0em00394h] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
We investigated the role of periphyton biofilms for the fate of three common herbicides, i.e. bentazone, metazachlor and metribuzin, at low, environmental levels and 100 times higher, during a 16 days laboratory experiment. We found that herbicide water concentrations were stable during the first 8 days, whereas substantial declines (>78%) occurred between days 8-16 for all three herbicides. These rapid declines were explained only to a small extent (<8% of the total herbicide loss) by biofilm sorption. As herbicide concentrations in light and dark treatments without biofilms were similar, and the applied light regimen did not cover the UV-spectrum, herbicide photolysis was ruled out as a possible explanation for the observed declines. Furthermore, based on the compounds' characteristics, also volatilization was judged negligible. Therefore, we conjecture that the observed declines in herbicides were due to biodegradation and subsequent evasion of 14CO2 that was driven by enzymatic action from heterotrophic microbes. We reason that heterotrophic microbes used herbicide molecules as labile organic C-sources during C-limitation. Future studies should identify the microbial communities and genes involved in biodegradation in order to understand better the role of biofilms for the self-purification of surface waters.
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Affiliation(s)
- Maria Alexandra Bighiu
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden.
| | - Willem Goedkoop
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Uppsala, Sweden.
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Wang Y, Wang SL, Xie T, Cao J. Activated carbon derived from waste tangerine seed for the high-performance adsorption of carbamate pesticides from water and plant. BIORESOURCE TECHNOLOGY 2020; 316:123929. [PMID: 32763805 DOI: 10.1016/j.biortech.2020.123929] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 07/21/2020] [Accepted: 07/25/2020] [Indexed: 06/11/2023]
Abstract
This research presents the tangerine seed activated carbon (TSAC), obtained from food waste (tangerine seed) by one-step pyrolysis method and applied to remove carbamate pesticides (CMs) from complex solutions. The effects of carbonization temperature and time on adsorption performance were studied. Structural properties of TSAC were determined by Fourier Transform Infrared Spectrometer, X-ray diffraction analysis, Raman spectroscopy, scanning electron microscope and nitrogen adsorption/desorption methods and compared with that of tangerine seed. The TSAC exhibited a specific surface area of 659.62 m2/g, a total pore volume of 0.6203 cc/g and a pore diameter of 1.410 nm. The influences of initial pesticide concentration, adsorption temperature and contact time were investigated through batch experiments. Pseudo-second-order kinetic model and Langmuir isotherm model were more suitable for CMs adsorption process onto TSAC. Furthermore, the thermodynamic research indicated that this adsorption process was spontaneous and exothermic.
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Affiliation(s)
- Yue Wang
- College of Pharmaceutical Sciences, Medical College, Hangzhou Normal University, Hangzhou 311121, PR China
| | - Shu-Ling Wang
- College of Pharmaceutical Sciences, Medical College, Hangzhou Normal University, Hangzhou 311121, PR China
| | - Tian Xie
- College of Pharmaceutical Sciences, Medical College, Hangzhou Normal University, Hangzhou 311121, PR China
| | - Jun Cao
- College of Pharmaceutical Sciences, Medical College, Hangzhou Normal University, Hangzhou 311121, PR China; College of Material Chemistry and Chemical Engineering, Hangzhou Normal University, Hangzhou 311121, PR China.
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Alexandrino DAM, Mucha AP, Almeida CMR, Carvalho MF. Microbial degradation of two highly persistent fluorinated fungicides - epoxiconazole and fludioxonil. JOURNAL OF HAZARDOUS MATERIALS 2020; 394:122545. [PMID: 32213384 DOI: 10.1016/j.jhazmat.2020.122545] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 03/10/2020] [Accepted: 03/14/2020] [Indexed: 06/10/2023]
Abstract
Biodegradation of two highly persistent fluorinated fungicides, epoxiconazole (EPO) and fludioxonil (FLU), by microbial consortia enriched from estuarine sediment and agricultural soil is reported. After an enrichment period of 6 months, four microbial consortia were able to completely remove and defluorinate the fungicides in co-metabolic conditions. Defluorination was biologically mediated and results suggest it is not a primary catabolic step, as fungicide removal was always faster than its defluorination. Three of the four enriched consortia had similar biodegradation performances in the absence of a co-substrate. Biodegradation kinetics revealed that microbial degradation followed a first-order kinetics, with cultures being capable of biodegrading concentrations up to 10 mg L-1 of EPO or FLU, in a maximum of 21 days. Estimated half-life values for these compounds were significantly lower than those reported in literature, highlighting the unique metabolic performance of the obtained consortia. Analysis of their microbial composition revealed that they integrate several bacterial species belonging to the Proteobacteria phylum, with the most common genera being Pseudomonas, Ochrobactrum and Comamonas. This is the first study providing clear evidence on the biodegradation of EPO and FLU, opening doors for the design of bioremediation technologies for the recovery of ecosystems polluted with such recalcitrant compounds.
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Affiliation(s)
- Diogo A M Alexandrino
- CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos s/n, 4450-208, Matosinhos, Portugal; Institute of Biomedical Sciences Abel Salazar, University of Porto, Rua de Jorge Viterbo Ferreira 228, 4050-313, Porto, Portugal.
| | - Ana P Mucha
- CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos s/n, 4450-208, Matosinhos, Portugal; Faculty of Sciences, University of Porto, Rua do Campo Alegre 790, 4150-171, Porto, Portugal
| | - C Marisa R Almeida
- CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos s/n, 4450-208, Matosinhos, Portugal
| | - Maria F Carvalho
- CIIMAR - Interdisciplinary Centre of Marine and Environmental Research, University of Porto, Terminal de Cruzeiros do Porto de Leixões, Avenida General Norton de Matos s/n, 4450-208, Matosinhos, Portugal
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Zhang L, Fang W, Li X, Gao G, Jiang J. Linking bacterial community shifts with changes in the dissolved organic matter pool in a eutrophic lake. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 719:137387. [PMID: 32114229 DOI: 10.1016/j.scitotenv.2020.137387] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2020] [Revised: 02/14/2020] [Accepted: 02/16/2020] [Indexed: 06/10/2023]
Abstract
Aquatic bacterial communities play crucial roles in the circulation of nutrients in watershed ecosystems. However, the interaction between bacterial communities and chromophoric dissolved organic matter (CDOM) in freshwater ecosystems has not been studied in depth. In our study, we examined the constitution and interactions of CDOM with the bacterial community in Lake Chaohu and its inflow rivers under the influence of different exogenous pollutants. The results revealed that the bacterial community diversity in the inflow rivers was significantly lower than that in the lake sites. Clustering of different types of polluted inflow rivers integrated with the most abundant genera observed in specific areas indicated that environmentally guided species selection had a large impact on the composition of aquatic bacterial communities. Moreover, our study suggests that communities in lake environments may be more susceptible to interference through a variety of physiologies or via functional redundancy, allowing them to preserve their community structure. Through linear discriminant analysis effect size (Lefse) methods, we revealed that some taxa (from phylum to genus) were consistently enriched in the lake sites. Based on correlation network analysis results, the supersession niches of bacterial community members related to different CDOM in the biogeochemical process was determined. This study provides an ecological basis for the control of external pollution and the protection of the water environment in watershed ecosystems.
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Affiliation(s)
- Lei Zhang
- School of Civil Engineering and Architecture, Chuzhou University, Chuzhou 239000, China; State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China.
| | - Wangkai Fang
- School of Civil Engineering and Architecture, Chuzhou University, Chuzhou 239000, China
| | - Xingchen Li
- School of Civil Engineering and Architecture, Chuzhou University, Chuzhou 239000, China
| | - Guang Gao
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
| | - Jiahu Jiang
- State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
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Rheinheimer Dos Santos D, Monteiro de Castro Lima JA, Paranhos Rosa de Vargas J, Camotti Bastos M, Santanna Dos Santos MA, Mondamert L, Labanowski J. Pesticide bioaccumulation in epilithic biofilms as a biomarker of agricultural activities in a representative watershed. ENVIRONMENTAL MONITORING AND ASSESSMENT 2020; 192:381. [PMID: 32430726 DOI: 10.1007/s10661-020-08264-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Accepted: 03/31/2020] [Indexed: 05/23/2023]
Abstract
Brazil is one of the largest consumers of pesticides in the world. The high rainfall rate and inadequate soil use and management promote the transfer of these compounds to the aquatic system. The aim of this study was to identify and quantify pesticides present in epilithic biofilms in order to evaluate the effectiveness of this matrix as a bioindicator able to discriminate areas and periods with different inputs of pesticides. Among the 25 pesticides analyzed in the biofilms, 20 compounds were detected. The epilithic biofilms picked up pesticides independent of their polarities, even in the period of lower use. The frequency and median concentration of five herbicides (2,4-D, atrazine, desethyl-atrazine, simazine, nicosulfuron), three fungicides (carbendazim, epoxiconazole, tebuconazole), and one insecticide (imidacloprid) were highest in biofilms sampled in summer crops during the growing period. Biofilms collected in the upper region of the catchment, where genetically modified soybean and corn cultivated in a no-tillage system prevail, the highest frequency and median concentration of three herbicides (2,4-D, thifensulfuron, isoproturon), four fungicides (carbendazim, epoxiconazole, tebuconazole, metconazole), and one insecticide (imidacloprid) were observed. Despite the excessive amounts of pesticides used in the catchment, the median values of all pesticides in the epilithic biofilm were considered low. The lower diversity and concentration of pesticides observed in the autumn/winter season is representative of lower use of pesticides, barriers to pesticide transfer from soil to water, and the biofilm's resilience capacity to decompose pesticides.
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Affiliation(s)
- Danilo Rheinheimer Dos Santos
- Universidade Federal de Santa Maria. Av. Roraima nº 1000. Cidade Universitária, Bairro Camobi. Centro de Ciências Rurais, Prédio 42, Departamento de Solos, Santa Maria, Rio Grande do Sul, Brazil
| | - José Augusto Monteiro de Castro Lima
- Universidade Federal de Santa Maria. Av. Roraima nº 1000. Cidade Universitária, Bairro Camobi. Centro de Ciências Rurais, Prédio 42, Departamento de Solos, Santa Maria, Rio Grande do Sul, Brazil
- Instituto Federal de Educação Ciência e Tecnologia - Alagoas, Campus Maragogi, Rodovia Arnon de Melo, AL 101 Norte, S/N Atemar de Barros, 56304205, Maragogi, AL, Brazil
- Université de Poitiers, IC2MP UMR 7285 ENSI Poitiers Bâtiment B16 7, rue Marcel Doré TSA, 41105 86073, Poitiers Cedex 9, France
| | - Jocelina Paranhos Rosa de Vargas
- Universidade Federal de Santa Maria. Av. Roraima nº 1000. Cidade Universitária, Bairro Camobi. Centro de Ciências Rurais, Prédio 42, Departamento de Solos, Santa Maria, Rio Grande do Sul, Brazil.
- Université de Poitiers, IC2MP UMR 7285 ENSI Poitiers Bâtiment B16 7, rue Marcel Doré TSA, 41105 86073, Poitiers Cedex 9, France.
| | - Marilia Camotti Bastos
- Universidade Federal de Santa Maria. Av. Roraima nº 1000. Cidade Universitária, Bairro Camobi. Centro de Ciências Rurais, Prédio 42, Departamento de Solos, Santa Maria, Rio Grande do Sul, Brazil
- Université de Poitiers, IC2MP UMR 7285 ENSI Poitiers Bâtiment B16 7, rue Marcel Doré TSA, 41105 86073, Poitiers Cedex 9, France
| | - Maria Alice Santanna Dos Santos
- Universidade Federal de Santa Maria. Av. Roraima nº 1000. Cidade Universitária, Bairro Camobi. Centro de Ciências Rurais, Prédio 42, Departamento de Solos, Santa Maria, Rio Grande do Sul, Brazil
| | - Leslie Mondamert
- Université de Poitiers, IC2MP UMR 7285 ENSI Poitiers Bâtiment B16 7, rue Marcel Doré TSA, 41105 86073, Poitiers Cedex 9, France
| | - Jérôme Labanowski
- Université de Poitiers, IC2MP UMR 7285 ENSI Poitiers Bâtiment B16 7, rue Marcel Doré TSA, 41105 86073, Poitiers Cedex 9, France
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Mahler BJ, Schmidt TS, Nowell LH, Qi SL, Van Metre PC, Hladik ML, Carlisle DM, Munn MD, May J. Biofilms Provide New Insight into Pesticide Occurrence in Streams and Links to Aquatic Ecological Communities. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:5509-5519. [PMID: 32309929 DOI: 10.1021/acs.est.9b07430] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Streambed sediment is commonly analyzed to assess occurrence of hydrophobic pesticides and risks to aquatic communities. However, stream biofilms also have the potential to accumulate pesticides and may be consumed by aquatic organisms. To better characterize risks to aquatic life, the U.S. Geological Survey Regional Stream Quality Assessment measured 93 current-use and 3 legacy pesticides in bed sediment and biofilm from 54 small streams in California across a range of land-use settings. On average, 4 times as many current-use pesticides were detected in biofilm at a site (median of 2) as in sediment (median of 0.5). Of 31 current-use pesticides detected, 20 were detected more frequently in biofilm than in sediment and 10 with equal frequency. Pyrethroids as a class were the most potentially toxic to benthic invertebrates, and of the 9 pyrethroids detected, 7 occurred more frequently in biofilm than sediment. We constructed general additive models to investigate relations between pesticides and 6 metrics of benthic community structure. Pesticides in biofilm improved fit in 4 of the 6 models, and pesticides in sediment improved fit in 2. The results indicate that the sampling of stream biofilms can complement bed-sediment sampling by identification of more current-use pesticides present and better estimation of ecological risks.
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Affiliation(s)
- Barbara J Mahler
- U.S. Geological Survey, Oklahoma-Texas Science Center Austin, Texas 78751, United States
| | - Travis S Schmidt
- U.S. Geological Survey, Colorado Water Science Center Lakewood, Colorado 80225, United States
| | - Lisa H Nowell
- U.S. Geological Survey, California Water Science Center Sacramento, California 95819, United States
| | - Sharon L Qi
- U.S. Geological Survey, Colorado Water Science Center Lakewood, Colorado 80225, United States
| | - Peter C Van Metre
- U.S. Geological Survey, Headquarters Reston, Virginia 20192, United States
| | - Michelle L Hladik
- U.S. Geological Survey, California Water Science Center Sacramento, California 95819, United States
| | - Daren M Carlisle
- U.S. Geological Survey, Headquarters Reston, Virginia 20192, United States
| | - Mark D Munn
- U.S. Geological Survey, Washington Water Science Center Tacoma, Washington 98402, United States
| | - Jason May
- U.S. Geological Survey, California Water Science Center Sacramento, California 95819, United States
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Lin Z, Zhang W, Pang S, Huang Y, Mishra S, Bhatt P, Chen S. Current Approaches to and Future Perspectives on Methomyl Degradation in Contaminated Soil/Water Environments. Molecules 2020; 25:E738. [PMID: 32046287 PMCID: PMC7036768 DOI: 10.3390/molecules25030738] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2019] [Revised: 02/03/2020] [Accepted: 02/07/2020] [Indexed: 01/10/2023] Open
Abstract
Methomyl is a broad-spectrum oxime carbamate commonly used to control arthropods, nematodes, flies, and crop pests. However, extensive use of this pesticide in agricultural practices has led to environmental toxicity and human health issues. Oxidation, incineration, adsorption, and microbial degradation methods have been developed to remove insecticidal residues from soil/water environments. Compared with physicochemical methods, biodegradation is considered to be a cost-effective and ecofriendly approach to the removal of pesticide residues. Therefore, micro-organisms have become a key component of the degradation and detoxification of methomyl through catabolic pathways and genetic determinants. Several species of methomyl-degrading bacteria have been isolated and characterized, including Paracoccus, Pseudomonas, Aminobacter, Flavobacterium, Alcaligenes, Bacillus, Serratia, Novosphingobium, and Trametes. The degradation pathways of methomyl and the fate of several metabolites have been investigated. Further in-depth studies based on molecular biology and genetics are needed to elaborate their role in the evolution of novel catabolic pathways and the microbial degradation of methomyl. In this review, we highlight the mechanism of microbial degradation of methomyl along with metabolic pathways and genes/enzymes of different genera.
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Affiliation(s)
- Ziqiu Lin
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China; (Z.L.); (W.Z.); (S.P.); (Y.H.); (S.M.); (P.B.)
- Guangdong Laboratory of Lingnan Modern Agriculture, Guangzhou 510642, China
| | - Wenping Zhang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China; (Z.L.); (W.Z.); (S.P.); (Y.H.); (S.M.); (P.B.)
- Guangdong Laboratory of Lingnan Modern Agriculture, Guangzhou 510642, China
| | - Shimei Pang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China; (Z.L.); (W.Z.); (S.P.); (Y.H.); (S.M.); (P.B.)
- Guangdong Laboratory of Lingnan Modern Agriculture, Guangzhou 510642, China
| | - Yaohua Huang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China; (Z.L.); (W.Z.); (S.P.); (Y.H.); (S.M.); (P.B.)
- Guangdong Laboratory of Lingnan Modern Agriculture, Guangzhou 510642, China
| | - Sandhya Mishra
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China; (Z.L.); (W.Z.); (S.P.); (Y.H.); (S.M.); (P.B.)
- Guangdong Laboratory of Lingnan Modern Agriculture, Guangzhou 510642, China
| | - Pankaj Bhatt
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China; (Z.L.); (W.Z.); (S.P.); (Y.H.); (S.M.); (P.B.)
- Guangdong Laboratory of Lingnan Modern Agriculture, Guangzhou 510642, China
| | - Shaohua Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou 510642, China; (Z.L.); (W.Z.); (S.P.); (Y.H.); (S.M.); (P.B.)
- Guangdong Laboratory of Lingnan Modern Agriculture, Guangzhou 510642, China
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25
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Rooney RC, Davy C, Gilbert J, Prosser R, Robichaud C, Sheedy C. Periphyton bioconcentrates pesticides downstream of catchment dominated by agricultural land use. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 702:134472. [PMID: 31731130 DOI: 10.1016/j.scitotenv.2019.134472] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Revised: 09/04/2019] [Accepted: 09/13/2019] [Indexed: 06/10/2023]
Abstract
Periphyton provides important ecosystem services in aquatic environments, including supporting diverse consumers. We studied pesticide bioconcentration in periphyton in a coastal marsh on Lake Erie. The marsh is within a protected area (Rondeau Provincial Park) but receives discharge from tributaries draining intensively farmed land. Periphyton bioconcentrated 20 pesticide chemicals above levels observed in adjacent water or sediment. Average bioconcentration factors ranged from 12 times for the herbicide dicamba to 6864 times for the fungicide boscalid on a dry-weight basis. Bioconcentration factors were not linearly related to pesticides' log Kow, log Koc, or water solubility (simple linear regressions, p > 0.43). The removal of pesticides from ambient water represents another valuable ecosystem service provided by periphyton. However, we caution that bioconcentration of pesticides in periphyton provides a mechanism through which contemporary and legacy pesticides may enter wetland food webs.
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Affiliation(s)
- R C Rooney
- Department of Biology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada.
| | - C Davy
- Wildlife Research and Monitoring Section, Ontario Ministry of Natural Resources and Forestry, Peterborough, Ontario K9L 1Z8, Canada; Environmental and Life Sciences Graduate Program, Trent University, Peterborough, Ontario K9L 0G2, Canada
| | - J Gilbert
- Department of Biology, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
| | - R Prosser
- School of Environmental Sciences, University of Guelph, Room 2226 Bovey Bldg., Guelph, Ontario N1G 2W1, Canada
| | - C Robichaud
- Department of Biology, University of Waterloo, Room B2-251, Waterloo, Ontario N2L 3G1, Canada
| | - C Sheedy
- Agriculture and Agri-Food Canada, Lethbridge Research and Development Centre, 5403 1(st) Avenue South, Lethbridge, Alberta T1J 4B1, Canada
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26
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Wang L, Hua X, Zhang L, Song N, Dong D, Guo Z. Influence of organic carbon fractions of freshwater biofilms on the sorption for phenanthrene and ofloxacin: The important role of aliphatic carbons. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 685:818-826. [PMID: 31238285 DOI: 10.1016/j.scitotenv.2019.06.203] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2019] [Revised: 06/13/2019] [Accepted: 06/13/2019] [Indexed: 06/09/2023]
Abstract
Sorption to biofilms is thought to be a crucial process controlling the fate of trace organic contaminants in aquatic systems. The organic composition of biofilms is regarded as the determining factor in the sorption mechanism of biofilm organic carbon fractions; however, its role is not well known. Here, the sorption of phenanthrene and ofloxacin was modeled with classic and emerging organic contaminants, respectively, by comparatively investigating nine type of freshwater biofilms cultured in a river, lake, and reservoir in spring, summer, and autumn. The chemical features of the nine biofilms were analyzed using elemental analysis, infrared spectroscopy, X-ray photoelectron spectroscopy, and carbon-13 nuclear magnetic resonance. Results showed that the freshwater biofilms were aliphatic-rich natural amorphous solid substances with O-containing functional groups, and their surface polarity was significantly lower than their bulk polarity. All the isotherms of phenanthrene and ofloxacin sorption by the biofilms were linear. The organic carbon-normalized partition coefficient values for phenanthrene and ofloxacin on the nine biofilms ranged from 91.9 to 364.2 L g-1 and 3.2 to 43.2 L g-1, respectively. The van der Waals interaction between a majority of aliphatic carbon (73.4%-83.9%) in biofilms and the two sorbates was much stronger than π-π interactions between a minority of aromatic carbon (12.7%-21.7%) and sorbates. The surface polarity of the biofilms regulated polar interactions including the hydrogen bonding and electron donor-acceptor interactions. Both the aliphatic carbon and surface polarity in the biofilms enhanced the sorption of phenanthrene and ofloxacin. The sorption characteristics and mechanisms of polycyclic aromatic hydrocarbons and antibiotics on biofilms shown in our present and previous studies are different from those of other ubiquitous natural solid materials such as soils and sediments. This study provides insight into the importance of aliphatic carbon fractions of freshwater biofilms for the sorption of classic and emerging organic contaminants.
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Affiliation(s)
- Liting Wang
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun 130012, China
| | - Xiuyi Hua
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun 130012, China
| | - Liwen Zhang
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun 130012, China
| | - Na Song
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun 130012, China
| | - Deming Dong
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun 130012, China
| | - Zhiyong Guo
- Key Laboratory of Groundwater Resources and Environment, Ministry of Education, Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun 130012, China.
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27
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Liu J, Yang M, Wang Y, Qu L, Zhong G. Enhanced diuron remediation by microorganism-immobilized silkworm excrement composites and their impact on soil microbial communities. JOURNAL OF HAZARDOUS MATERIALS 2019; 376:29-36. [PMID: 31103596 DOI: 10.1016/j.jhazmat.2019.05.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2018] [Revised: 04/25/2019] [Accepted: 05/08/2019] [Indexed: 06/09/2023]
Abstract
In response to the potential threats stemming from the constantly increasing consumption of herbicides, bioremediation offers a beneficial technology for reducing the widespread herbicide contamination. In order to facilitate the in-situ degradation of diuron, Arthrobacter globiformis D47 is captured onto a biocompatible carrier to assemble the microorganism-immobilized silkworm excrement (MSE) composites. By characterization, bacterial cells are intensively entrapped in/onto the carriers, showing high survival and stable catalytic degradation of target pollutants. Meanwhile, MES composites display excellent adaptiveness and feasibility under different conditions, and the average half-life of diuron is shortened to 7.69 d in sugarcane field where diuron is regularly sprayed for weed management. Importantly, we assess that the use of MSE may generally boost the overall xenobiotic-degrading ability, likely due to the slight alternation of the diversity and composition of soil microbial communities. Taking together, the presented MSE provides an attractive in situ approach for the efficient diuron removal as well as for the more feasible utilization of various pollutant-degrading microorganisms.
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Affiliation(s)
- Jie Liu
- Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, Key Laboratory of Integrated Pest Management of Crop in South China, Ministry of Agriculture, South China Agricultural University, Guangzhou 510642, PR China
| | - Menrang Yang
- Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, Key Laboratory of Integrated Pest Management of Crop in South China, Ministry of Agriculture, South China Agricultural University, Guangzhou 510642, PR China
| | - Yutai Wang
- Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, Key Laboratory of Integrated Pest Management of Crop in South China, Ministry of Agriculture, South China Agricultural University, Guangzhou 510642, PR China
| | - Liwen Qu
- Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, Key Laboratory of Integrated Pest Management of Crop in South China, Ministry of Agriculture, South China Agricultural University, Guangzhou 510642, PR China
| | - Guohua Zhong
- Key Laboratory of Natural Pesticide and Chemical Biology, Ministry of Education, Key Laboratory of Integrated Pest Management of Crop in South China, Ministry of Agriculture, South China Agricultural University, Guangzhou 510642, PR China.
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28
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Liao K, Bai Y, Huo Y, Jian Z, Hu W, Zhao C, Qu J. Use of convertible flow cells to simulate the impacts of anthropogenic activities on river biofilm bacterial communities. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 653:148-156. [PMID: 30408663 DOI: 10.1016/j.scitotenv.2018.10.363] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 10/24/2018] [Accepted: 10/27/2018] [Indexed: 06/08/2023]
Abstract
Bacterial attachment to surfaces and the development of biofilms are crucial processes during the self-purification of polluted rivers. Biofilm bacterial communities also are a potential indicator of the human impact on an aquatic system. Here, we used indoor reactors with 7.7cm3 transparent convertible flow cells to observe the formation of biofilms in river water from different land-use areas (i.e., an undisturbed mountainous area, a wastewater-discharge urban area, and a pesticide-fertilizer applied agricultural area). We then compared the bacterial biomass, composition, and function among the formed biofilms and explored whether the biofilm bacterial communities formed in polluted river water (urban area) could shift to those formed in unpolluted water (mountainous area) after simulating water-body remediation. After 60d of indoor biofilm cultivation, the biofilms formed with the three types of influent were markedly different. Anthropogenic activities (e.g., wastewater discharge and pesticide-fertilizer use) facilitated biofilm bacterial production and the metabolic rate and altered the composition and metabolic patterns of the biofilm bacterial communities. After switching from an urban water to mountainous water influent in the same reactor, the biofilm bacterial communities that initially formed in the polluted discharge did not shift to that formed in unpolluted water. This result indicated that even after water remediation, the composition of the river biofilm bacterial community would not recover to a community like that observed under non-polluted conditions. Our study highlights possible issues related to current pollution-remediation routines and emphasizes the importance of sustainable anthropogenic activities within river basins.
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Affiliation(s)
- Kailingli Liao
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China; Foreign Economic Cooperation Office, Ministry of Ecology and Environment, Beijing 100035, China
| | - Yaohui Bai
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Yang Huo
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhiyu Jian
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Wanchao Hu
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Chen Zhao
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Jiuhui Qu
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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29
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Sharma P, Rohilla D, Chaudhary S, Kumar R, Singh AN. Nanosorbent of hydroxyapatite for atrazine: A new approach for combating agricultural runoffs. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 653:264-273. [PMID: 30412871 DOI: 10.1016/j.scitotenv.2018.10.352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 10/05/2018] [Accepted: 10/26/2018] [Indexed: 06/08/2023]
Abstract
The attention of current work was on the fabrication of effective nanoadsorbent of hydroxyapatite (HAp) for the controlled release of atrazine (ATZ) formulation. The ATZ-HAp complex (ATZ@HAp) was able to inhibit the growth of Brassica sp. under in situ conditions. This developed methodology aspires to cease the agricultural runoffs of ATZ applied with the HAp adjuvant and ensure their effective functioning. The efficacy of the protocol was mainly accomplished by adsorbing ATZ over the surface of HAp NPs that restricted its premature runoff and promoted the prolonged herbicidal efficiency. The influence of fundamental parameters i.e., HAp dose, ATZ dose and initial pH on the adsorption process was investigated systematically. The suitability of ATZ@HAp complex for real world application was adjudged after proofing its toxicological behaviour and its role in Zea mays plantations. The complex was found to be non-toxic and nurturing due to its phosphate rich nature. Further investigations of ATZ@HAp complex and its effect on the non-target species will help in establishing an effective framework for their commercial use in agricultural practices.
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Affiliation(s)
- Priyanka Sharma
- Department of Environment Studies, Panjab University, Chandigarh 160014, India
| | - Deepak Rohilla
- Department of Chemistry and Centre of Advanced Studies in Chemistry, Panjab University, Chandigarh 160014, India
| | - Savita Chaudhary
- Department of Chemistry and Centre of Advanced Studies in Chemistry, Panjab University, Chandigarh 160014, India.
| | - Rajeev Kumar
- Department of Environment Studies, Panjab University, Chandigarh 160014, India
| | - A N Singh
- Department of Botany, Panjab University, Chandigarh 160014, India
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30
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Branchet P, Cadot E, Fenet H, Sebag D, Ngatcha BN, Borrell-Estupina V, Ngoupayou JRN, Kengne I, Braun JJ, Gonzalez C. Polar pesticide contamination of an urban and peri-urban tropical watershed affected by agricultural activities (Yaoundé, Center Region, Cameroon). ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:17690-17715. [PMID: 29671229 DOI: 10.1007/s11356-018-1798-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2017] [Accepted: 03/19/2018] [Indexed: 06/08/2023]
Abstract
Urban agriculture is crucial to local populations, but the risk of it contaminating water has rarely been documented. The aim of this study was to assess pesticide contamination of surface waters from the Méfou watershed (Yaoundé, Cameroon) by 32 selected herbicides, fungicides, and insecticides (mainly polar) according to their local application, using both grab sampling and polar organic compounds integrative samplers (POCIS). Three sampling campaigns were conducted in the March/April and October/November 2015 and June/July 2016 rainy seasons in urban and peri-urban areas. The majority of the targeted compounds were detected. The quantification frequencies of eight pesticides were more than 20% with both POCIS and grab sampling, and that of diuron and atrazine reached 100%. Spatial differences in contamination were evidenced with higher contamination in urban than peri-urban rivers. In particular, diuron was identified as an urban contaminant of concern because its concentrations frequently exceeded the European water quality guideline of 0.200 μg/L in freshwater and may thus represent an ecological risk due to a risk quotient > 1 for algae observed in 94% of grab samples. This study raises concerns about the impacts of urban agriculture on the quality of water resources and to a larger extent on the health of the inhabitants of cities in developing countries. Graphical abstract ᅟ.
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Affiliation(s)
- Perrine Branchet
- Laboratoire de Génie de l'Environnement Industriel (LGEI), IMT Mines Alès, University of Montpellier, 6, Avenue de Clavières, 30100, Ales, France.
| | - Emmanuelle Cadot
- HydroSciences Montpellier, IRD, CNRS, University of Montpellier, CC 057-163, rue Auguste Broussonnet, 34090, Montpellier, France
| | - Hélène Fenet
- HydroSciences Montpellier, IRD, CNRS, University of Montpellier, CC 057-163, rue Auguste Broussonnet, 34090, Montpellier, France
| | - David Sebag
- HydroSciences Montpellier, IRD, CNRS, University of Montpellier, CC 057-163, rue Auguste Broussonnet, 34090, Montpellier, France
- Normandie Univ, UNIROUEN, UNICAEN, CNRS, M2C, Rouen, France
| | - Benjamin Ngounou Ngatcha
- Department of Earth Sciences, Faculty of Sciences, University of Ngaoundéré, Ngaoundere, Cameroon
| | - Valérie Borrell-Estupina
- HydroSciences Montpellier, IRD, CNRS, University of Montpellier, CC 057-163, rue Auguste Broussonnet, 34090, Montpellier, France
| | | | - Ives Kengne
- Wastewater Research Unit, Faculty of Sciences, University of Yaoundé I, Yaounde, Cameroon
| | - Jean-Jacques Braun
- Géosciences Environnement Toulouse, CNRS, IRD, CNAP, CNES, University of Toulouse III, Toulouse, France
| | - Catherine Gonzalez
- Laboratoire de Génie de l'Environnement Industriel (LGEI), IMT Mines Alès, University of Montpellier, 6, Avenue de Clavières, 30100, Ales, France
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Ćwieląg-Piasecka I, Witwicki M, Jerzykiewicz M, Jezierska J. Can Carbamates Undergo Radical Oxidation in the Soil Environment? A Case Study on Carbaryl and Carbofuran. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:14124-14134. [PMID: 29171253 DOI: 10.1021/acs.est.7b03386] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Radical oxidation of carbamate insecticides, namely carbaryl and carbofuran, was investigated with spectroscopic (electron paramagnetic resonance [EPR] and UV-vis) and theoretical (density functional theory [DFT] and ab initio orbital-optimized spin-component scaled MP2 [OO-SCS-MP2]) methods. The two carbamates were subjected to reaction with •OH, persistent DPPH• and galvinoxyl radical, as well as indigenous radicals of humic acids. The influence of fulvic acids on carbamate oxidation was also tested. The results obtained with EPR and UV-vis spectroscopy indicate that carbamates can undergo direct reactions with various radical species, oxidizing themselves into radicals in the process. Hence, they are prone to participate in the prolongation step of the radical chain reactions occurring in the soil environment. Theoretical calculations revealed that from the thermodynamic point of view hydrogen atom transfer is the preferred mechanism in the reactions of the two carbamates with the radicals. The activity of carbofuran was determined experimentally (using pseudo-first-order kinetics) and theoretically to be noticeably higher in comparison with carbaryl and comparable with gallic acid. The findings of this study suggest that the radicals present in soil can play an important role in natural remediation mechanisms of carbamates.
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Affiliation(s)
- Irmina Ćwieląg-Piasecka
- Institute of Soil Science and Environmental Protection, Wroclaw University of Environmental and Life Sciences , Grunwaldzka 53 St., Wroclaw, Poland
| | - Maciej Witwicki
- Faculty of Chemistry, Wroclaw University , 14 F. Joliot-Curie St., 50-383 Wroclaw, Poland
| | - Maria Jerzykiewicz
- Faculty of Chemistry, Wroclaw University , 14 F. Joliot-Curie St., 50-383 Wroclaw, Poland
| | - Julia Jezierska
- Faculty of Chemistry, Wroclaw University , 14 F. Joliot-Curie St., 50-383 Wroclaw, Poland
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García-Mancha N, Monsalvo VM, Puyol D, Rodriguez JJ, Mohedano AF. Enhanced anaerobic degradability of highly polluted pesticides-bearing wastewater under thermophilic conditions. JOURNAL OF HAZARDOUS MATERIALS 2017; 339:320-329. [PMID: 28658641 DOI: 10.1016/j.jhazmat.2017.06.032] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Revised: 06/14/2017] [Accepted: 06/15/2017] [Indexed: 06/07/2023]
Abstract
This work presents a sustainable and cost-competitive solution for hardly biodegradable pesticides-bearing wastewater treatment in an anaerobic expanded granular sludge bed (EGSB) reactor at mesophilic (35°C) and thermophilic (55°C). The reactor was operated in continuous mode during 160days, achieving an average COD removal of 33 and 44% under mesophilic and thermophilic conditions, respectively. The increase of temperature improved the biomass activity and the production of methane by 35%. Around 96% of pesticides identified in raw wastewater were not detected in both mesophilic and thermophilic effluents. A dramatic selection of the microbial population in anaerobic granules was caused by the presence of pesticides, which also changed significantly when the temperature was increased. Pesticides caused a significant inhibition on methanogenesis, especially over acetoclastic methanogens. Aerobic biodegradability tests of the resulting anaerobic effluents revealed that aerobic post-treatment is also a feasible and effective option, yielding more than 60% COD reduction.
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Affiliation(s)
- N García-Mancha
- Chemical Engineering Section, University Autonoma de Madrid, Francisco Tomas y Valiente 7, 28049 Madrid, Spain.
| | - V M Monsalvo
- Innovation and Technology Department, FCC Aqualia, Av. del Camino de Santiago, 40, 28050 Madrid, Spain.
| | - D Puyol
- Department of Chemical and Energy Tech., Chemical and Environmental Tech., Mechanical Tech. and Analytical Chemistry ESCET, Rey Juan Carlos University, 28933 Madrid, Spain.
| | - J J Rodriguez
- Chemical Engineering Section, University Autonoma de Madrid, Francisco Tomas y Valiente 7, 28049 Madrid, Spain.
| | - A F Mohedano
- Chemical Engineering Section, University Autonoma de Madrid, Francisco Tomas y Valiente 7, 28049 Madrid, Spain.
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Lerch TZ, Chenu C, Dignac MF, Barriuso E, Mariotti A. Biofilm vs. Planktonic Lifestyle: Consequences for Pesticide 2,4-D Metabolism by Cupriavidus necator JMP134. Front Microbiol 2017; 8:904. [PMID: 28588567 PMCID: PMC5440565 DOI: 10.3389/fmicb.2017.00904] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Accepted: 05/03/2017] [Indexed: 01/01/2023] Open
Abstract
The development of bacterial biofilms in natural environments may alter important functions, such as pollutant bioremediation by modifying both the degraders' physiology and/or interactions within the matrix. The present study focuses on the influence of biofilm formation on the metabolism of a pesticide, 2,4-dichlorophenoxyacetic acid (2,4-D), by Cupriavidus necator JMP134. Pure cultures were established in a liquid medium with 2,4-D as a sole carbon source with or without sand grains for 10 days. Bacterial numbers and 2,4-D concentrations in solution were followed by spectrophotometry, the respiration rate by gas chromatography and the surface colonization by electron microscopy. In addition, isotopic techniques coupled with Fatty Acid Methyl Ester (FAME) profiling were used to determine possible metabolic changes. After only 3 days, approximately 80% of the cells were attached to the sand grains and microscopy images showed that the porous medium was totally clogged by the development of a biofilm. After 10 days, there was 25% less 2,4-D in the solution in samples with sand than in control samples. This difference was due to (1) a higher (+8%) mineralization of 2,4-D by sessile bacteria and (2) a retention (15%) of 2,4-D in the biofilm matrix. Besides, the amount of carbohydrates, presumably constituting the biofilm polysaccharides, increased by 63%. Compound-specific isotope analysis revealed that the FAME isotopic signature was less affected by the biofilm lifestyle than was the FAME composition. These results suggest that sessile bacteria differ more in their anabolism than in their catabolism compared to their planktonic counterparts. This study stresses the importance of considering interactions between microorganisms and their habitat when studying pollutant dynamics in porous media.
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Affiliation(s)
- Thomas Z Lerch
- UMR IEES-Paris, Institute of Ecology and Environmental Sciences of Paris, (Centre National de la Recherche Scientifique, UPMC, Institut National de la Recherche Agronomique, UPEC, IRD, Université Paris Diderot)Créteil, France
| | - Claire Chenu
- UMR ECOSYS, Écologie Fonctionnelle et Écotoxicologie des Agroécosystèmes (Institut National de la Recherche Agronomique, AgroParisTech, Université Paris-Saclay)Thiverval-Grignon, France
| | - Marie F Dignac
- UMR ECOSYS, Écologie Fonctionnelle et Écotoxicologie des Agroécosystèmes (Institut National de la Recherche Agronomique, AgroParisTech, Université Paris-Saclay)Thiverval-Grignon, France
| | - Enrique Barriuso
- UMR ECOSYS, Écologie Fonctionnelle et Écotoxicologie des Agroécosystèmes (Institut National de la Recherche Agronomique, AgroParisTech, Université Paris-Saclay)Thiverval-Grignon, France
| | - André Mariotti
- UMR IEES-Paris, Institute of Ecology and Environmental Sciences of Paris, (Centre National de la Recherche Scientifique, UPMC, Institut National de la Recherche Agronomique, UPEC, IRD, Université Paris Diderot)Créteil, France
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Song C, Hu H, Ao H, Wu Y, Wu C. Removal of parabens and their chlorinated by-products by periphyton: influence of light and temperature. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:5566-5575. [PMID: 28032288 DOI: 10.1007/s11356-016-8301-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2016] [Accepted: 12/19/2016] [Indexed: 06/06/2023]
Abstract
The extensive use of parabens as preservatives in food and pharmaceuticals and personal care products results in frequent detection of their residuals in aquatic environment. In this work, the adsorption and removal of four parabens (methyl-, ethyl-, propyl-, and butyl-paraben) and two chlorinated methyl-parabens (CMPs) by periphyton were studied. Characteristics of the periphyton were identified to explore the possible relationship between paraben removal and periphyton properties. Results showed that linear adsorption coefficients (K d) vary from 554.4 to 808.6 L kg-1 for the adsorption parabens and CMPs to autoclaved periphyton. The adsorption strength is positively related to the hydrophobicity of these compounds. Removal of parabens from water by periphyton was efficient with half-life (t 1/2) values estimated using first-order kinetic model ranging from 0.49 to 3.29 days, but CMPs were more persistent with t 1/2 ranging from 1.15 to 25.57 days, and t 1/2 increased with the chlorination degree. Higher incubation temperature accelerated the removal of all tested compounds, while a better removal of CMPs was observed in dark condition. Analysis of periphyton properties suggests that bacteria played a more important role in the removal of CMPs, but no specific relationship between periphyton properties and paraben removal ability can be established.
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Affiliation(s)
- Chaofeng Song
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Donghu South Road No. 7, Wuhan, 430072, People's Republic of China
- Yangtze River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Wuhan, 430223, China
| | - Hongjuan Hu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Donghu South Road No. 7, Wuhan, 430072, People's Republic of China
| | - Hongyi Ao
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Donghu South Road No. 7, Wuhan, 430072, People's Republic of China
| | - Yonghong Wu
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Sciences, Chinese Academy of Sciences, Nanjing, 210008, China
| | - Chenxi Wu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Donghu South Road No. 7, Wuhan, 430072, People's Republic of China.
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The Multiple Roles of Diatoms in Environmental Applications: Prospects for Sol-Gel Modified Diatoms. ADVANCES IN SOL-GEL DERIVED MATERIALS AND TECHNOLOGIES 2017. [DOI: 10.1007/978-3-319-50144-4_4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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36
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Yu Z, He Z, Tao X, Zhou J, Yang Y, Zhao M, Zhang X, Zheng Z, Yuan T, Liu P, Chen Y, Nolan V, Li X. The shifts of sediment microbial community phylogenetic and functional structures during chromium (VI) reduction. ECOTOXICOLOGY (LONDON, ENGLAND) 2016; 25:1759-1770. [PMID: 27637513 DOI: 10.1007/s10646-016-1719-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 08/29/2016] [Indexed: 05/13/2023]
Abstract
The Lanzhou reach of the Yellow River, located at the upstream of Lanzhou, has been contaminated by heavy metals and polycyclic aromatic hydrocarbons over a long-time. We hypothesized that indigenous microbial communities would remediate those contaminants and some unique populations could play an important role in this process. In this study, we investigated the sediment microbial community structure and function from the Lanzhou reach. Sediment samples were collected from two nearby sites (site A and site B) in the Lanzhou reach along the Yellow River. Sediment geochemical property data showed that site A sediment samples contained significantly (p < 0.05) higher heavy metals than site B, such as chromium (Cr), manganese (Mn), and copper (Cu). Both site A and B samples were incubated with or without hexavalent chromium (Cr (VI)) for 30 days in the laboratory, and Cr (VI) reduction was only observed in site A sediment samples. After incubation, MiSeq sequencing of 16S rRNA gene amplicons revealed that the phylogenetic composition and structure of microbial communities changed in both samples, and especially Proteobacteria, as the most abundant phylum increased from 45.1 % to 68.2 % in site A, and 50.1 % to 71.3 % in site B, respectively. Some unique OTUs and populations affiliated with Geobacter, Clostridium, Desulfosporosinus and Desulfosporosinus might be involved in Cr (VI) reduction in site A. Furthermore, GeoChip 4.0 (a comprehensive functional gene array) data showed that genes involved in carbon and nitrogen cycling and metal resistance significantly (p < 0.05) increased in site A sediment samples. All the results indicated that indigenous sediment microbial communities might be able to remediate contaminants like Cr (VI), and this information provides possible strategies for future bioremediation of the Lanzhou reach.
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Affiliation(s)
- Zhengsheng Yu
- Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, China
| | - Zhili He
- Department of Microbiology and Plant Biology and Institute for Environmental Genomics, University of Oklahoma, Norman, OK, 73019, USA
| | - Xuanyu Tao
- Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, China
| | - Jizhong Zhou
- Department of Microbiology and Plant Biology and Institute for Environmental Genomics, University of Oklahoma, Norman, OK, 73019, USA
| | - Yunfeng Yang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Mengxin Zhao
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Xiaowei Zhang
- Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, China
| | - Zhe Zheng
- Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, China
| | - Tong Yuan
- Department of Microbiology and Plant Biology and Institute for Environmental Genomics, University of Oklahoma, Norman, OK, 73019, USA
| | - Pu Liu
- Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, China
| | - Yong Chen
- Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, China
| | - Virgo Nolan
- Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, China
| | - Xiangkai Li
- Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, China.
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Katagi T. Pesticide behavior in modified water-sediment systems. JOURNAL OF PESTICIDE SCIENCE 2016; 41:121-132. [PMID: 30363119 PMCID: PMC6140654 DOI: 10.1584/jpestics.d16-060] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 08/10/2016] [Indexed: 05/29/2023]
Abstract
The standardized laboratory water-sediment study in darkness is utilized as primary information on pesticide behavior to assess its ecotoxicological impacts in the edge-of-field water bodies. The half-lives of pesticide in water and sediment are key parameters to predict its environmental concentration, and its metabolic profiles help to avoid overlooking unexpected toxicological impacts from metabolites. However, no consideration of environmental factors such as sunlight and aquatic macrophytes is included, and this may lead to a conservative assessment. We review the experimental factors in the existing standardized design and then the effects of illumination and aquatic macrophytes introduced to the water-sediment system. The effects of temperature and the water-sediment ratio should be investigated in more detail and the pesticide behavior is possibly modified by illumination via photodegradation and/or metabolism in phototrophic microorganisms. Aquatic macrophytes play a major role as an additional sorption site and in further pesticide metabolism.
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Affiliation(s)
- Toshiyuki Katagi
- Environmental Health Science Laboratory, Sumitomo Chemical Co., Ltd., 3–1–98 Kasugadenaka, Konohana-Ku, Osaka 554–8558, Japan
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38
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Lessons from rhizosphere and gastrointestinal ecosystems for inventive design of sustainable wastes recycling bioreactors. Biochem Eng J 2016. [DOI: 10.1016/j.bej.2015.08.016] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Huerta B, Rodriguez-Mozaz S, Nannou C, Nakis L, Ruhí A, Acuña V, Sabater S, Barcelo D. Determination of a broad spectrum of pharmaceuticals and endocrine disruptors in biofilm from a waste water treatment plant-impacted river. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 540:241-9. [PMID: 26087856 DOI: 10.1016/j.scitotenv.2015.05.049] [Citation(s) in RCA: 101] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2015] [Revised: 05/13/2015] [Accepted: 05/13/2015] [Indexed: 05/25/2023]
Abstract
Wastewater treatment plants (WWTPs) are one of the main sources of pharmaceuticals and endocrine disrupting compounds in freshwater ecosystems, and several studies have reported bioaccumulation of these compounds in different organisms in those ecosystems. River biofilms are exceptional indicators of pollution, but very few studies have focused on the accumulation of these emerging contaminants. The objectives of this study were first to develop an efficient analytical methodology for the simultaneous analysis of 44 pharmaceuticals and 13 endocrine disrupting compounds in biofilm, and second, to assess persistence, distribution, and bioaccumulation of these contaminants in natural biofilms inhabiting a WWTP-impacted river. The method is based on pressurized liquid extraction, purification by solid-phase extraction, and analysis by ultra performance liquid chromatography coupled to a mass spectrometer (UPLC-MS/MS) in tandem. Recoveries for pharmaceuticals were 31-137%, and for endocrine disruptors 32-93%. Method detection limits for endocrine disruptors were in the range of 0.2-2.4 ng g(-1), and for pharmaceuticals, 0.07-6.7 ng g(-1). A total of five endocrine disruptors and seven pharmaceuticals were detected in field samples at concentrations up to 100 ng g(-1).
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Affiliation(s)
- B Huerta
- Catalan Institute for Water Research (ICRA), Carrer Emili Grahit 101, 17003 Girona, Spain
| | - S Rodriguez-Mozaz
- Catalan Institute for Water Research (ICRA), Carrer Emili Grahit 101, 17003 Girona, Spain.
| | - C Nannou
- Catalan Institute for Water Research (ICRA), Carrer Emili Grahit 101, 17003 Girona, Spain
| | - L Nakis
- Catalan Institute for Water Research (ICRA), Carrer Emili Grahit 101, 17003 Girona, Spain
| | - A Ruhí
- Catalan Institute for Water Research (ICRA), Carrer Emili Grahit 101, 17003 Girona, Spain; Julie Ann Wrigley Global Institute of Sustainability, Arizona State University, Tempe AZ 85287, USA
| | - V Acuña
- Catalan Institute for Water Research (ICRA), Carrer Emili Grahit 101, 17003 Girona, Spain
| | - S Sabater
- Catalan Institute for Water Research (ICRA), Carrer Emili Grahit 101, 17003 Girona, Spain; Institute of Aquatic Ecology, University of Girona, Campus de Montivili, 17071 Girona, Spain
| | - D Barcelo
- Catalan Institute for Water Research (ICRA), Carrer Emili Grahit 101, 17003 Girona, Spain; Water and Soil Quality Research Group, Department of Environmental Chemistry, IDAEA, CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain
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Salem FB, Said OB, Aissa P, Mahmoudi E, Monperrus M, Grunberger O, Duran R. Pesticides in Ichkeul Lake-Bizerta Lagoon Watershed in Tunisia: use, occurrence, and effects on bacteria and free-living marine nematodes. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:36-48. [PMID: 26165992 DOI: 10.1007/s11356-015-4991-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Accepted: 06/30/2015] [Indexed: 06/04/2023]
Abstract
This study aimed to identify the most commonly used agricultural pesticides around Ichkeul Lake-Bizerta Lagoon watershed. First survey of pesticide use on agricultural watershed was performed with farmers, Regional Commissioner for Agricultural Development, and pesticide dealers. Then, sediment contamination by pesticides and response of benthic communities (bacteria and free-living marine nematode) were investigated. The analysis of 22 active organochlorine pesticides in sediments was performed according to quick, easy, cheap, effective, rugged, and safe (QuEChERS) method, biodiversity of indigenous bacterial community sediment was determined by terminal restriction fragment length polymorphism (T-RFLP), and free-living marine nematodes were counted. The results of the field survey showed that iodosulfuron, mesosulfuron, 2,4-dichlorophenoxyacetic acid (2,4 D), glyphosate, and fenoxaprops were the most used herbicides, tebuconazole and epoxiconazole the most used fungicides, and deltamethrin the most used insecticide. Sixteen organochlorine pesticide compounds among the 22 examined were detected in sediments up to 2 ppm in Ichkeul Lake, endrin, dieldrin, and hexachlorocyclohexane being the most detected molecules. The most pesticide-contaminated site in the lake presented the higher density of nematode, but when considering all sites, no clear correlation with organochlorine pesticide (OCP) content could be established. The bacterial community structure in the most contaminated site in the lake was characterized by the terminal restriction fragments (T-RFs) 97, 146, 258, 285, and 335 while the most contaminated site in the lagoon was characterized by the T-RFs 54, 263, 315, 403, and 428. Interestingly, T-RFs 38 and 143 were found in the most contaminated sites of both lake and lagoon ecosystems, indicating that they were resistant to OCPs and able to cope with environmental fluctuation of salinity. In contrast, the T-RFs 63, 100, 118, and 381 in the lake and the T-RFs 40, 60, 80, 158, 300, 321, and 357 in the lagoon were sensitive to OCPs. This study highlighted that the intensive use of pesticides in agriculture, through transfer to aquatic ecosystem, may disturb the benthic ecosystem functioning of the protected area. The free-living marine nematodes and bacterial communities represent useful proxy to follow the ecosystem health and its capacity of resilience.
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Affiliation(s)
- Fida Ben Salem
- Laboratory of Environment Biomonitoring, Faculty of Sciences of Bizerta, University of Carthage, 7021, Zarzouna, Tunisia.
- Equipe Environnement et Microbiologie, MELODY Group, UMR CNRS IPREM 5254-IBEAS, Université de Pau et des Pays de l'Adour, Pau cedex, France.
- Laboratoire de Chimie Analytique Bio-Inorganique et Environnement, IPREM UMR 5254 CNRS, Université de Pau et des Pays de l'Adour, Pau cedex, France.
| | - Olfa Ben Said
- Laboratory of Environment Biomonitoring, Faculty of Sciences of Bizerta, University of Carthage, 7021, Zarzouna, Tunisia
| | - Patricia Aissa
- Laboratory of Environment Biomonitoring, Faculty of Sciences of Bizerta, University of Carthage, 7021, Zarzouna, Tunisia
| | - Ezzeddine Mahmoudi
- Laboratory of Environment Biomonitoring, Faculty of Sciences of Bizerta, University of Carthage, 7021, Zarzouna, Tunisia
| | - Mathilde Monperrus
- Laboratoire de Chimie Analytique Bio-Inorganique et Environnement, IPREM UMR 5254 CNRS, Université de Pau et des Pays de l'Adour, Pau cedex, France
| | - Olivier Grunberger
- IRD, UMR-LISAH (IRD-INRA-SupAgro), Bat 24, 2 place Viala, 34060, Montpellier cedex 01, France
| | - Robert Duran
- Equipe Environnement et Microbiologie, MELODY Group, UMR CNRS IPREM 5254-IBEAS, Université de Pau et des Pays de l'Adour, Pau cedex, France
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Maouati H, Sanhoury MAK, Merlet D, Chehidi I. Bis(thiocarbamates): Synthesis and Substituent Effects on the Barrier to N-CO Rotation. HETEROATOM CHEMISTRY 2015. [DOI: 10.1002/hc.21272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hamida Maouati
- Laboratory of Structural Organic Chemistry; Department of Chemistry; Faculty of Sciences of Tunis; University of Tunis El Manar; Tunis 2092 Tunisia
| | - M. A. K. Sanhoury
- Laboratory of Structural Organic Chemistry; Department of Chemistry; Faculty of Sciences of Tunis; University of Tunis El Manar; Tunis 2092 Tunisia
| | - D. Merlet
- Equipe de RMN en Milieu Orienté; ICMMO UMR CNRS 8182; Université Paris-Sud; ORSAY Cedex 91405 France
| | - I. Chehidi
- Laboratory of Structural Organic Chemistry; Department of Chemistry; Faculty of Sciences of Tunis; University of Tunis El Manar; Tunis 2092 Tunisia
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Kolmakova OV, Gladyshev MI, Rozanov AS, Peltek SE, Trusova MY. Spatial biodiversity of bacteria along the largest Arctic river determined by next-generation sequencing. FEMS Microbiol Ecol 2014; 89:442-50. [PMID: 24848736 DOI: 10.1111/1574-6941.12355] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 04/29/2014] [Accepted: 05/11/2014] [Indexed: 11/28/2022] Open
Abstract
The biodiversity of bacterial communities along the Yenisei River at section c. 1800 km was studied using next-generation sequencing of 16S rRNA genes and common biodiversity indices. Overall, 3022 unique operational taxonomic units were identified. Actinobacteria and Proteobacteria were the dominant phyla at all sampling sites. The highest alpha-diversity values were found in the middle section of the studied river. The beta-diversity of bacterial assemblages in the river was related to the surrounding landscape (biome): three distinctly different bacterial assemblages occurred in sections of the river, situated in mountain taiga, plain taiga and in a region of permafrost, covered by forest-tundra and tundra. Tributaries arising from these different landscapes likely contributed substantially to the variations of Yenisei bacterial communities. In contrast to a prediction of the river continuum concept, the proportion of photoautotrophic Cyanobacteria in bacterial assemblages did not increase downstream, but peaked at the middle section.
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Affiliation(s)
- Olesya V Kolmakova
- Siberian Federal University, Krasnoyarsk, Russia; Institute of Biophysics of Siberian Branch of Russian Academy of Sciences, Krasnoyarsk, Russia
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Marques JM, da Silva TF, Vollu RE, Blank AF, Ding GC, Seldin L, Smalla K. Plant age and genotype affect the bacterial community composition in the tuber rhizosphere of field-grown sweet potato plants. FEMS Microbiol Ecol 2014; 88:424-35. [PMID: 24597529 DOI: 10.1111/1574-6941.12313] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Revised: 02/21/2014] [Accepted: 02/23/2014] [Indexed: 11/30/2022] Open
Abstract
The hypothesis that sweet potato genotypes containing different starch yields in their tuberous roots can affect the bacterial communities present in the rhizosphere (soil adhering to tubers) was tested in this study. Tuberous roots of field-grown sweet potato of genotypes IPB-149 (commercial genotype), IPB-052, and IPB-137 were sampled three and six months after planting and analyzed by denaturing gradient gel electrophoresis (DGGE) and pyrosequencing analysis of 16S rRNA genes PCR-amplified from total community DNA. The statistical analysis of the DGGE fingerprints showed that both plant age and genotypes influenced the bacterial community structure in the tuber rhizosphere. Pyrosequencing analysis showed that the IPB-149 and IPB-052 (both with high starch content) displayed similar bacterial composition in the tuber rhizosphere, while IPB-137 with the lowest starch content was distinct. In comparison with bulk soil, higher 16S rRNA gene copy numbers (qPCR) and numerous genera with significantly increased abundance in the tuber rhizosphere of IPB-137 (Sphingobium, Pseudomonas, Acinetobacter, Stenotrophomonas, Chryseobacterium) indicated a stronger rhizosphere effect. The genus Bacillus was strongly enriched in the tuber rhizosphere samples of all sweet potato genotypes studied, while other genera showed a plant genotype-dependent abundance. This is the first report on the molecular identification of bacteria being associated with the tuber rhizosphere of different sweet potato genotypes.
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Affiliation(s)
- Joana M Marques
- Laboratório de Genética Microbiana, Instituto de Microbiologia Paulo de Góes, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brazil
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