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Xia R, Sun M, Balcázar JL, Yu P, Hu F, Alvarez PJJ. Benzo[a]pyrene stress impacts adaptive strategies and ecological functions of earthworm intestinal viromes. THE ISME JOURNAL 2023:10.1038/s41396-023-01408-x. [PMID: 37069233 DOI: 10.1038/s41396-023-01408-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2023] [Revised: 03/24/2023] [Accepted: 03/30/2023] [Indexed: 04/19/2023]
Abstract
The earthworm gut virome influences the structure and function of the gut microbiome, which in turn influences worm health and ecological functions. However, despite its ecological and soil quality implications, it remains elusive how earthworm intestinal phages respond to different environmental stress, such as soil pollution. Here we used metagenomics and metatranscriptomics to investigate interactions between the worm intestinal phages and their bacteria under different benzo[a]pyrene (BaP) concentrations. Low-level BaP (0.1 mg kg-1) stress stimulated microbial metabolism (1.74-fold to control), and enhanced the antiphage defense system (n = 75) against infection (8 phage-host pairs). Low-level BaP exposure resulted in the highest proportion of lysogenic phages (88%), and prophages expressed auxiliary metabolic genes (AMGs) associated with nutrient transformation (e.g., amino acid metabolism). In contrast, high-level BaP exposure (200 mg kg-1) disrupted microbial metabolism and suppressed the antiphage systems (n = 29), leading to the increase in phage-bacterium association (37 phage-host pairs) and conversion of lysogenic to lytic phages (lysogenic ratio declined to 43%). Despite fluctuating phage-bacterium interactions, phage-encoded AMGs related to microbial antioxidant and pollutant degradation were enriched, apparently to alleviate pollution stress. Overall, these findings expand our knowledge of complex phage-bacterium interactions in pollution-stressed worm guts, and deepen our understanding of the ecological and evolutionary roles of phages.
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Affiliation(s)
- Rong Xia
- Soil Ecology Lab, Key Laboratory of Plant Immunity, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization and Jiangsu Key Laboratory for Solid Organic Waste Utilization, Nanjing, 210095, China
| | - Mingming Sun
- Soil Ecology Lab, Key Laboratory of Plant Immunity, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization and Jiangsu Key Laboratory for Solid Organic Waste Utilization, Nanjing, 210095, China.
| | - José Luis Balcázar
- Catalan Institute for Water Research (ICRA), 17003, Girona, Spain
- University of Girona, 17004, Girona, Spain
| | - Pingfeng Yu
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou, 310085, China.
| | - Feng Hu
- Soil Ecology Lab, Key Laboratory of Plant Immunity, Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization and Jiangsu Key Laboratory for Solid Organic Waste Utilization, Nanjing, 210095, China
| | - Pedro J J Alvarez
- Civil and Environmental Engineering Department, Rice University, Houston, TX, 77005, USA
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Braeuer S, Van Helden T, Van Acker T, Leroux O, Van Der Straeten D, Verbeken A, Borovička J, Vanhaecke F. Quantitative mapping of mercury and selenium in mushroom fruit bodies with laser ablation-inductively coupled plasma-mass spectrometry. Anal Bioanal Chem 2022; 414:7517-7530. [PMID: 35927365 PMCID: PMC9482896 DOI: 10.1007/s00216-022-04240-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Revised: 06/26/2022] [Accepted: 07/19/2022] [Indexed: 11/19/2022]
Abstract
This work describes the development of a novel method for quantitative mapping of Hg and Se in mushroom fruit body tissues with laser ablation coupled to inductively coupled plasma-mass spectrometry (LA-ICP-MS). Different parameters of the protocol for preparation of the standards used for quantification via external calibration were assessed, e.g., the dissolution temperature of gelatin standards and the addition of chitosan and L-cysteine as additives to the gelatin-based calibration droplets to better match the sample matrix. While chitosan was not suited for this purpose, the presence of L-cysteine considerably improved the figures of merit of the calibration, leading to limits of detection of 0.006 and 0.3 µg g-1 for Hg and Se, respectively, at a pixel size of 20 × 20 µm. Further, an in-house reference material, ideally suited for the validation of the method for application to mushroom samples, was successfully prepared from a paste of Boletus edulis. The newly developed method was used to investigate the distribution of Hg and Se in tissue sections of five porcini mushroom individuals of three different species (Boletus edulis, Boletus aereus, and Boletus pinophilus) and one sample of a parasol mushroom (Macrolepiota procera). For one sample, additional areas were ablated at higher spatial resolution, with a laser spot size down to 5 µm, which allows a detailed investigation of the spatial distribution of Hg and Se in mushrooms.
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Affiliation(s)
- Simone Braeuer
- Atomic & Mass Spectrometry - A&MS research unit, Department of Chemistry, Ghent University, Campus Sterre, Krijgslaan 281 - S12, 9000, Ghent, Belgium.
- Institute of Chemistry, University of Graz, Universitaetsplatz 1, 8010, Graz, Austria.
| | - Tom Van Helden
- Atomic & Mass Spectrometry - A&MS research unit, Department of Chemistry, Ghent University, Campus Sterre, Krijgslaan 281 - S12, 9000, Ghent, Belgium
| | - Thibaut Van Acker
- Atomic & Mass Spectrometry - A&MS research unit, Department of Chemistry, Ghent University, Campus Sterre, Krijgslaan 281 - S12, 9000, Ghent, Belgium
| | - Olivier Leroux
- Laboratory of Functional Plant Biology, Department of Biology, Ghent University, K. L. Ledeganckstraat 35, 9000, Ghent, Belgium
| | - Dominique Van Der Straeten
- Laboratory of Functional Plant Biology, Department of Biology, Ghent University, K. L. Ledeganckstraat 35, 9000, Ghent, Belgium
| | - Annemieke Verbeken
- Research Group Mycology, Department of Biology, Ghent University, K. L. Ledeganckstraat 35, 9000, Ghent, Belgium
| | - Jan Borovička
- Nuclear Physics Institute of the Czech Academy of Sciences, Hlavní 130, 25068, Husinec-Řež, Czech Republic
- Institute of Geology of the Czech Academy of Sciences, Rozvojová 269, 16500, Prague 6, Czech Republic
| | - Frank Vanhaecke
- Atomic & Mass Spectrometry - A&MS research unit, Department of Chemistry, Ghent University, Campus Sterre, Krijgslaan 281 - S12, 9000, Ghent, Belgium
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Jiang W, Zhai W, Liu X, Wang F, Liu D, Yu X, Wang P. Co-exposure of Monensin Increased the Risks of Atrazine to Earthworms. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:7883-7894. [PMID: 35593893 DOI: 10.1021/acs.est.2c00226] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Antibiotics could enter farmlands through sewage irrigation or manure application, causing combined pollution with pesticides. Antibiotics may affect the environmental fate of pesticides and even increase their bioavailability. In this study, the influence of monensin on the degradation, toxicity, and availability of atrazine in soil-earthworm microcosms was investigated. Monensin inhibited the degradation of atrazine, changed the metabolite patterns in soil, and increased the bioavailability of atrazine in earthworms. Atrazine and monensin had a significant synergistic effect on earthworms in the acute toxic test. In long-term toxicity tests, co-exposure of atrazine and monensin also led to worse effects on earthworms including oxidative stress, energy metabolism disruption, and cocoon production compared to single exposure. The expression of tight junction proteins was down-regulated significantly by monensin, indicating that the intestinal barrier of earthworms was weakened, possibly causing the increased bioavailability of atrazine. The expressions of heat shock protein 70 (Hsp70) and reproductive and ontogenetic factors (ANN, TCTP) were all downregulated in binary exposure, indicating that the resilience and cocoon production of earthworms were further weakened under combined pollution. Monensin disturbed the energy metabolism and weakened the intestinal barrier of earthworms. These results showed that monensin increased the risks of atrazine in agricultural areas.
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Affiliation(s)
- Wenqi Jiang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Department of Applied Chemistry, China Agricultural University, Beijing 100193, P.R. China
- Institute of Agricultural Resources & Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P.R. China
| | - Wangjing Zhai
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Department of Applied Chemistry, China Agricultural University, Beijing 100193, P.R. China
| | - Xueke Liu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Department of Applied Chemistry, China Agricultural University, Beijing 100193, P.R. China
| | - Fang Wang
- School of Ecology and Environment, Beijing Technology and Business University, Beijing 100048, China
| | - Donghui Liu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Department of Applied Chemistry, China Agricultural University, Beijing 100193, P.R. China
| | - Xiangyang Yu
- Institute of Agricultural Resources & Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, P.R. China
| | - Peng Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Department of Applied Chemistry, China Agricultural University, Beijing 100193, P.R. China
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Li M, Liu Y, Xu G, Wang Y, Yu Y. Impacts of polyethylene microplastics on bioavailability and toxicity of metals in soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 760:144037. [PMID: 33348149 DOI: 10.1016/j.scitotenv.2020.144037] [Citation(s) in RCA: 67] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Revised: 11/15/2020] [Accepted: 11/18/2020] [Indexed: 06/12/2023]
Abstract
In this study, we investigated the bioavailability and toxicity of metals (Cu and Ni) in the soil containing polyethylene microplastics (PE-MPs). The bioavailability of the metals determined by the five-step chemical sequential extraction method increased with the addition of MPs (0.1%, 1%, 10%) in the soil, which was confirmed by the adsorption-desorption characteristics. To further examine the bioavailability and toxicity of metals, earthworms (Eisenia fetida) were exposed to soil containing Cu2+ (100 mg/kg) or Ni2+ (40 mg/kg) with different amounts (0.01%, 0.05%, and 0.1%) of PE-MPs for 21 days. The highest concentrations of Cu2+ and Ni2+ in earthworms reached to 73.3 and 36.3 mg/kg, respectively. Moreover, metal concentrations in earthworms increased with MP contents in the soil, which was consistent with the bioavailability measured by the sequential extraction method. Furthermore, changes in biomarkers including peroxidase (POD), catalase (CAT) and superoxide dismutase (SOD) activity, malondialdehyde (MDA) contents, and related gene expression levels in earthworms suggested that the pollutants caused toxicity to earthworms. Overall, MPs increased the bioavailability of metals in the soil and the toxic effects to earthworms. These findings provide insights regarding the impacts of MPs on the bioavailability of metals and the combined toxic effects of these two kinds of pollutants on terrestrial animals.
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Affiliation(s)
- Ming Li
- Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; College of Forestry, Northeast Forestry University, Harbin 150040, China
| | - Yang Liu
- Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Guanghui Xu
- Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yang Wang
- Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China
| | - Yong Yu
- Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
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Hamzić Gregorčič S, Strojnik L, Potočnik D, Vogel-Mikuš K, Jagodic M, Camin F, Zuliani T, Ogrinc N. Can We Discover Truffle's True Identity? Molecules 2020; 25:E2217. [PMID: 32397327 PMCID: PMC7248893 DOI: 10.3390/molecules25092217] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Revised: 05/04/2020] [Accepted: 05/07/2020] [Indexed: 01/20/2023] Open
Abstract
This study used elemental and stable isotope composition to characterize Slovenian truffles and used multi-variate statistical analysis to classify truffles according to species and geographical origin. Despite the fact that the Slovenian truffles shared some similar characteristics with the samples originating from other countries, differences in the element concentrations suggest that respective truffle species may respond selectively to nutrients from a certain soil type under environmental and soil conditions. Cross-validation resulted in a 77% correct classification rate for determining the geographical origin and a 74% correct classification rate to discriminate between species. The critical parameters for geographical origin discriminations were Sr, Ba, V, Pb, Ni, Cr, Ba/Ca and Sr/Ca ratios, while from stable isotopes δ18O and δ13C values are the most important. The key variables that distinguish T.magnatum from other species are the levels of V and Zn and δ15N values. Tuber aestivum can be separated based on the levels of Ni, Cr, Mn, Mg, As, and Cu. This preliminary study indicates the possibility to differentiate truffles according to their variety and geographical origin and suggests widening the scope to include stable strontium isotopes.
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Affiliation(s)
- Staša Hamzić Gregorčič
- Department of Environmental Sciences, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (S.H.G.); (L.S.); (D.P.); (M.J.); (T.Z.)
- Jožef Stefan International Postgraduate School, Jamova 39, 1000 Ljubljana, Slovenia
| | - Lidija Strojnik
- Department of Environmental Sciences, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (S.H.G.); (L.S.); (D.P.); (M.J.); (T.Z.)
- Jožef Stefan International Postgraduate School, Jamova 39, 1000 Ljubljana, Slovenia
| | - Doris Potočnik
- Department of Environmental Sciences, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (S.H.G.); (L.S.); (D.P.); (M.J.); (T.Z.)
- Jožef Stefan International Postgraduate School, Jamova 39, 1000 Ljubljana, Slovenia
| | - Katarina Vogel-Mikuš
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, 1000 Ljubljana, Slovenia;
| | - Marta Jagodic
- Department of Environmental Sciences, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (S.H.G.); (L.S.); (D.P.); (M.J.); (T.Z.)
- Jožef Stefan International Postgraduate School, Jamova 39, 1000 Ljubljana, Slovenia
| | - Federica Camin
- Department of Food Quality and Nutrition, Research and Innovation Centre, Fondazione Edmund Mach, 38010 San Michele all’Adige, Italy;
- Center Agriculture Food Environment (C3A), University of Trento, via Mach 1, 38010 San Michele all’Adige (TN), Italy
| | - Tea Zuliani
- Department of Environmental Sciences, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (S.H.G.); (L.S.); (D.P.); (M.J.); (T.Z.)
- Jožef Stefan International Postgraduate School, Jamova 39, 1000 Ljubljana, Slovenia
| | - Nives Ogrinc
- Department of Environmental Sciences, Jožef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia; (S.H.G.); (L.S.); (D.P.); (M.J.); (T.Z.)
- Jožef Stefan International Postgraduate School, Jamova 39, 1000 Ljubljana, Slovenia
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Kavčič A, Mikuš K, Debeljak M, Teun van Elteren J, Arčon I, Kodre A, Kump P, Karydas AG, Migliori A, Czyzycki M, Vogel-Mikuš K. Localization, ligand environment, bioavailability and toxicity of mercury in Boletus spp. and Scutiger pes-caprae mushrooms. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 184:109623. [PMID: 31518823 DOI: 10.1016/j.ecoenv.2019.109623] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Revised: 08/16/2019] [Accepted: 08/28/2019] [Indexed: 05/22/2023]
Abstract
This study provides information on mercury (Hg) localization, speciation and ligand environment in edible mushrooms: Boletus edulis, B. aereus and Scutiger pes-caprae collected at non-polluted and Hg polluted sites, by LA-ICP-MS, SR-μ-XRF and Hg L3-edge XANES and EXAFS. Mushrooms (especially young ones) collected at Hg polluted sites can contain more than 100 μg Hg g-1 of dry mass. Imaging of the element distribution shows that Hg accumulates mainly in the spore-forming part (hymenium) of the cap. Removal of hymenium before consumption can eliminate more than 50% of accumulated Hg. Mercury is mainly coordinated to di-thiols (43-82%), followed by di-selenols (13-35%) and tetra-thiols (12-20%). Mercury bioavailability, as determined by feeding the mushrooms to Spanish slugs (known metal bioindicators owing to accumulation of metals in their digestive gland), ranged from 4% (S. pes-caprae) to 30% (B. aereus), and decreased with increasing selenium (Se) levels in the mushrooms. Elevated Hg levels in mushrooms fed to the slugs induced toxic effects, but these effects were counteracted with increasing Se concentrations in the mushrooms, pointing to a protective role of Se against Hg toxicity through HgSe complexation. Nevertheless, consumption of the studied mushroom species from Hg polluted sites should be avoided.
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Affiliation(s)
- Anja Kavčič
- University of Ljubljana, Biotechnical Faculty, Department of Biology, Jamnikarjeva 101, SI-1000, Ljubljana, Slovenia
| | - Klemen Mikuš
- Biotechnical Educational Centre Ljubljana, Cesta V Mestni Log 47, SI-1000, Ljubljana, Slovenia
| | - Marta Debeljak
- National Institute of Chemistry, Hajdrihova 19, SI-1000, Ljubljana, Slovenia
| | | | - Iztok Arčon
- Jozef Stefan Institute, Jamova 39, SI-1000, Ljubljana, Slovenia; University of Nova Gorica, Vipavska 13, SI-5000, Nova Gorica, Slovenia
| | - Alojz Kodre
- Jozef Stefan Institute, Jamova 39, SI-1000, Ljubljana, Slovenia; University of Ljubljana, Faculty for Mathematics and Physics, Jadranska 19, SI-1000, Ljubljana, Slovenia
| | - Peter Kump
- Jozef Stefan Institute, Jamova 39, SI-1000, Ljubljana, Slovenia
| | - Andreas Germanos Karydas
- Institute of Nuclear and Particle Physics, National Centre for Scientific Research 'Demokritos', Patr. Grigoriou E' & 27 Neapoleos St, 153 41, Agia Paraskevi, Greece
| | - Alessandro Migliori
- Nuclear Science and Instrumentation Laboratory, International Atomic Energy Agency (IAEA) Laboratories, A-2444, Seibersdorf, Austria
| | - Mateusz Czyzycki
- Karlsruhe Institute of Technology, Institute for Photon Science and Synchrotron Radiation, Laboratory for Applications of Synchrotron Radiation, Kaiserstrasse 12, 76131, Karlsruhe, Germany; AGH University of Science and Technology, Faculty of Physics and Applied Computer Science, Al. Mickiewicza 30, 30-059, Krakow, Poland
| | - Katarina Vogel-Mikuš
- University of Ljubljana, Biotechnical Faculty, Department of Biology, Jamnikarjeva 101, SI-1000, Ljubljana, Slovenia; Jozef Stefan Institute, Jamova 39, SI-1000, Ljubljana, Slovenia.
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Debeljak M, van Elteren JT, Špruk A, Izmer A, Vanhaecke F, Vogel-Mikuš K. The role of arbuscular mycorrhiza in mercury and mineral nutrient uptake in maize. CHEMOSPHERE 2018; 212:1076-1084. [PMID: 30286537 DOI: 10.1016/j.chemosphere.2018.08.147] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 08/22/2018] [Accepted: 08/28/2018] [Indexed: 06/08/2023]
Abstract
This work aimed to study the role of arbuscular mycorrhizal fungi (AMF) in Hg and major mineral nutrient uptake and tissue localization of these elements in the roots of maize plants. Maize plants were grown in pots filled with non- and Hg-contaminated substrate (50 μg Hg g-1 as HgCl2) and inoculated with two types of AMF inocula: a) Glomus sp. originating from Hg-polluted soil of a former Hg smelting site in Idrija, Slovenia, and b) commercial AM inoculum Symbivit. Controls were inoculated by corresponding bacterial extracts only. Tissue localization of Hg and major mineral nutrients was performed by laser ablation-inductively coupled plasma-mass spectroscopy (LA-ICP-MS) on cryofixed and freeze-dried root cross-sections. AMF colonization increased plant biomass in non-contaminated substrate, while this effect was not seen in Hg-contaminated substrate. Hg increased total plant biomass more than AMF inoculation, possibly through hormetic effects. AMF increased Hg uptake into the roots, as well as Hg transfer to the shoots. AMF affected plant mineral nutrient uptake, depending on the type of AMF inoculum and the presence of Hg. In the roots, Hg was mainly localized in rhizodermis and endodermis, followed by the cortex and the central cylinder. Higher Hg concentrations were detected in the central cylinder of AM plants than in that of the controls, pointing to a higher Hg mobility and potential bioavailability in AMF inoculated plants.
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Affiliation(s)
- Marta Debeljak
- Department of Analytical Chemistry, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia
| | - Johannes T van Elteren
- Department of Analytical Chemistry, National Institute of Chemistry, Hajdrihova 19, SI-1000 Ljubljana, Slovenia
| | - Ana Špruk
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia
| | - Andrei Izmer
- Department of Chemistry, Atomic & Mass Spectrometry A&MS Research Unit, Ghent University, Campus Sterre, Krijgslaan 281-S12, BE-9000 Ghent, Belgium
| | - Frank Vanhaecke
- Department of Chemistry, Atomic & Mass Spectrometry A&MS Research Unit, Ghent University, Campus Sterre, Krijgslaan 281-S12, BE-9000 Ghent, Belgium
| | - Katarina Vogel-Mikuš
- Department of Biology, Biotechnical Faculty, University of Ljubljana, Jamnikarjeva 101, SI-1000 Ljubljana, Slovenia; Jožef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.
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