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Meyer L, Guyot S, Chalot M, Capelli N. The potential of microorganisms as biomonitoring and bioremediation tools for mercury-contaminated soils. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 262:115185. [PMID: 37385017 DOI: 10.1016/j.ecoenv.2023.115185] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 06/20/2023] [Accepted: 06/24/2023] [Indexed: 07/01/2023]
Abstract
Mercury (Hg) pollution is a global issue due to the high toxicity and wide dispersion of Hg around the world. Whether due to anthropogenic activities or natural processes, Hg emissions are steadily increasing, with very high levels in some regions, directly threatening human and ecosystem health. However, bacteria and fungi have evolved and adapted in response to Hg-induced stress and have developed tolerance mechanisms, notably based on the mer operon system that is involved in Hg uptake and biovolatilization via Hg reduction reactions. Other processes, such as bioaccumulation or extracellular sequestration, are involved in Hg resistance, and the study of contaminated soils has allowed the isolation of a number of microorganisms capable of these mechanisms, with strong potential for the implementation of bioremediation approaches. In addition to playing an important role in determining the fate of Hg in the biogeochemical cycle, these microorganisms can indeed be applied to reduce Hg concentrations or at least stabilize Hg for the remediation of polluted soils. Moreover, thanks to the development of biotechnological tools, bioremediation based on Hg-tolerant microorganisms can be optimized. Finally, these microorganisms are relevant candidates for biomonitoring, for example, through the engineering of biosensors, because the detection of Hg is a major issue in preserving the health of living beings.
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Affiliation(s)
- Lorraine Meyer
- Chrono-environnement UMR 6249, Université de Franche-Comté CNRS, F-25000 Besançon, France
| | - Stéphane Guyot
- Université de Bourgogne, Institut Agro, PAM UMR A 02.102, F-21000 Dijon, France
| | - Michel Chalot
- Chrono-environnement UMR 6249, Université de Franche-Comté CNRS, F-25000 Besançon, France; Université de Lorraine, F-54000 Nancy, France
| | - Nicolas Capelli
- Chrono-environnement UMR 6249, Université de Franche-Comté CNRS, F-25000 Besançon, France.
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2
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The Absorption and Distribution Characteristics of Willow Clones to Copper and Its Detoxification Mechanism. ADSORPT SCI TECHNOL 2022. [DOI: 10.1155/2022/3170046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Phytoremediation technology is a measure to purify pollutants in soil or water through the absorption, volatilization, root filtration, degradation, and stabilization of plants, and its core is to find plants with large biomass and high enrichment. The wild willow tree found in Tonglushan is a fast-growing Euphorbiaceae plant, which has strong tolerance to the heavy metal copper (Cu) and has the characteristics of developed root system, barren resistance, and high economic value. Taking willow as the research object, this paper studied the composition, copper enrichment sites, morphology, subcellular distribution characteristics and absorption, transportation, and enrichment mechanism of willow root exudates under copper stress through hydroponic and pot experiments. By adding phosphate fertilizers, inducers, and other agronomic control measures, the strengthening technology and mechanism of Cu-contaminated soil phytoremediation were studied. The main research contents and results are as follows: the results of hydroponics and pot experiments show that the willow tree has a certain tolerance to Cu, and Cu mainly accumulates in its roots. Oxalic acid, succinic acid, tartaric acid, citric acid, and malic acid are the main organic acids in willow root exudates. Root exudation activity acidified the rhizosphere soil, increased acid exchangeability, and reducible Cu content, while other forms of Cu content decreased. Root exudates affect the uptake and accumulation of copper by willow trees by altering the bioavailability of copper in soil.
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3
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Singh S, Kumar V, Gupta P, Singh A. Conjoint application of novel bacterial isolates on dynamic changes in oxidative stress responses of axenic Brassica juncea L. in Hg-stress soils. JOURNAL OF HAZARDOUS MATERIALS 2022; 434:128854. [PMID: 35429756 DOI: 10.1016/j.jhazmat.2022.128854] [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: 01/27/2022] [Revised: 03/24/2022] [Accepted: 04/01/2022] [Indexed: 06/14/2023]
Abstract
This experimental study explores the possible role of three Hg-resistant bacterial strains in the enhanced growth of the mustard plant (Brassica juncea) under Hg-stress conditions. Under different concentrations of Hg, a pot scale experiment with Brassica juncea L. was performed to investigate the potential of bacterial strains for phytoremediation under Hg stress conditions. The results showed that all three strains, as well as their consortium, were capable of stimulating plant growth, biomass, and anti-oxidative enzyme activities. In comparison to the individual strains, the consortiums of all three strains were more prominent in the intensification of Brassica juncea L. physiological activity. Under Hg-stress conditions, all three strains increased the level of antioxidative content in Brassica juncea, indicating an increase in enzyme activity to cope with oxidative stress. Among all the three strains, Citrobacter Freundii (IITISM25) showed the highest accumulation potential in B. juncea followed by Morganella morganii (IITISM23) and Brevundimonas Dimunta (IITISM22). Hence, the results suggest that the IITISM22, IITISM23, IITISM25 strains and their consortium are very effective in phytoremediation and promote Brassica juncea growth under Hg-stress conditions.
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Affiliation(s)
- Shalini Singh
- Laboratory of Applied Microbiology, Department of Environmental Science & Engineering, Indian Institute of Technology, Indian School of Mines, Dhanbad 826 004, Jharkhand, India
| | - Vipin Kumar
- Laboratory of Applied Microbiology, Department of Environmental Science & Engineering, Indian Institute of Technology, Indian School of Mines, Dhanbad 826 004, Jharkhand, India.
| | - Pratishtha Gupta
- Laboratory of Applied Microbiology, Department of Environmental Science & Engineering, Indian Institute of Technology, Indian School of Mines, Dhanbad 826 004, Jharkhand, India
| | - Ankur Singh
- Laboratory of Applied Microbiology, Department of Environmental Science & Engineering, Indian Institute of Technology, Indian School of Mines, Dhanbad 826 004, Jharkhand, India
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4
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Baragaño D, Forján R, Álvarez N, Gallego JR, González A. Zero valent iron nanoparticles and organic fertilizer assisted phytoremediation in a mining soil: Arsenic and mercury accumulation and effects on the antioxidative system of Medicago sativa L. JOURNAL OF HAZARDOUS MATERIALS 2022; 433:128748. [PMID: 35405586 DOI: 10.1016/j.jhazmat.2022.128748] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Revised: 03/05/2022] [Accepted: 03/18/2022] [Indexed: 06/14/2023]
Abstract
Zero valent iron nanoparticles (nZVI) attract interest given their effectiveness in soil remediation. However, little attention has been given to their impacts on plants. Likewise, although fertilizers are commonly used to enhance phytoremediation, their effects on As mobilization, resulting in potential toxic effects, require further study. In this context, we examined the impact of As and Hg accumulation on the antioxidative system of Medicago sativa grown in a soil amended with organic fertilizer and/or nZVI. The experiment consisted of 60 pots. Plants were pre-grown and transferred to pots, which were withdrawn along time for monitoring purposes. As and Hg were monitored in the soil-plant system, and parameters related to oxidative stress, photosynthetic pigments, and non-protein thiol compounds (NPTs) were measured. In general, the application of nZVI immobilized As in soil and increased Hg accumulation in the plant, although it surprisingly decreased oxidative stress. Plants in nZVI-treated soil also showed an increase in NPT content in roots. In contrast, the application of the fertilizer mobilized As, thereby improving bioaccumulation factors. However, when combining fertilizer with nZVI, the As accumulation is mitigated. This observation reveals that simultaneous amendments are a promising approach for soil stabilization and the phytomanagement of As/Hg-polluted soils.
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Affiliation(s)
- D Baragaño
- INDUROT and Environmental Biogeochemistry & Raw Materials Group, Campus of Mieres, University of Oviedo, 33600 Mieres, Spain.
| | - R Forján
- INDUROT and Environmental Biogeochemistry & Raw Materials Group, Campus of Mieres, University of Oviedo, 33600 Mieres, Spain
| | - N Álvarez
- Department of Organisms and Systems Biology, Area of Plant Physiology-IUBA, University of Oviedo, Catedrático Rodrigo Uría s/n, 33006 Oviedo, Spain
| | - J R Gallego
- INDUROT and Environmental Biogeochemistry & Raw Materials Group, Campus of Mieres, University of Oviedo, 33600 Mieres, Spain
| | - A González
- Department of Organisms and Systems Biology, Area of Plant Physiology-IUBA, University of Oviedo, Catedrático Rodrigo Uría s/n, 33006 Oviedo, Spain
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Kurniawan SB, Ramli NN, Said NSM, Alias J, Imron MF, Abdullah SRS, Othman AR, Purwanti IF, Hasan HA. Practical limitations of bioaugmentation in treating heavy metal contaminated soil and role of plant growth promoting bacteria in phytoremediation as a promising alternative approach. Heliyon 2022; 8:e08995. [PMID: 35399376 PMCID: PMC8983376 DOI: 10.1016/j.heliyon.2022.e08995] [Citation(s) in RCA: 22] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 01/12/2022] [Accepted: 02/17/2022] [Indexed: 12/30/2022] Open
Abstract
Bioaugmentation, the addition of cultured microorganisms to enhance the currently existing microbial community, is an option to remediate contaminated areas. Several studies reported the success of the bioaugmentation method in treating heavy metal contaminated soil, but concerns related to the applicability of this method in real-scale application were raised. A comprehensive analysis of the mechanisms of heavy metal treatment by microbes (especially bacteria) and the concerns related to the possible application in the real scale were juxtaposed to show the weakness of the claim. This review proposes the use of bioaugmentation-assisted phytoremediation in treating heavy metal contaminated soil. The performance of bioaugmentation-assisted phytoremediation in treating heavy metal contaminated soil as well as the mechanisms of removal and interactions between plants and microbes are also discussed in detail. Bioaugmentation-assisted phytoremediation shows greater efficiencies and performs complete metal removal from soil compared with only bioaugmentation. Research related to selection of hyperaccumulator species, potential microbial species, analysis of interaction mechanisms, and potential usage of treating plant biomass after treatment are suggested as future research directions to enhance this currently proposed topic.
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Affiliation(s)
- Setyo Budi Kurniawan
- Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, UKM, Bangi, Selangor, Malaysia
| | - Nur Nadhirah Ramli
- Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, UKM, Bangi, Selangor, Malaysia
| | - Nor Sakinah Mohd Said
- Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, UKM, Bangi, Selangor, Malaysia
| | - Jahira Alias
- Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, UKM, Bangi, Selangor, Malaysia
| | - Muhammad Fauzul Imron
- Study Program of Environmental Engineering, Department of Biology, Faculty of Science and Technology, Universitas Airlangga, Kampus C UNAIR, Jalan Mulyorejo, Surabaya, 60115, Indonesia
- Corresponding author.
| | - Siti Rozaimah Sheikh Abdullah
- Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, UKM, Bangi, Selangor, Malaysia
- Corresponding author.
| | - Ahmad Razi Othman
- Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, UKM, Bangi, Selangor, Malaysia
| | - Ipung Fitri Purwanti
- Department of Environmental Engineering, Faculty of Civil, Planning, and Geo Engineering, Institut Teknologi Sepuluh Nopember, Kampus ITS Sukolilo, Surabaya, 60111, Indonesia
| | - Hassimi Abu Hasan
- Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, UKM, Bangi, Selangor, Malaysia
- Research Centre for Sustainable Process Technology (CESPRO), Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, 43600, UKM, Bangi, Selangor, Malaysia
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Chang J, Yan Z, Dong J, Wu X, Meng Z, Shi Y, Chen J. Mechanisms controlling the transformation of and resistance to mercury(II) for a plant-associated Pseudomonas sp. strain, AN-B15. JOURNAL OF HAZARDOUS MATERIALS 2022; 425:127948. [PMID: 34915295 DOI: 10.1016/j.jhazmat.2021.127948] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 11/16/2021] [Accepted: 11/26/2021] [Indexed: 05/09/2023]
Abstract
Bioremediation using mercury (Hg)-volatilizing and immobilizing bacteria is an eco-friendly and cost-effective strategy for Hg-polluted farmland. However, the mechanisms controlling the transformation of and resistance to Hg(II) by these bacteria remain unknown. In this study, a plant-associated Pseudomonas sp. strain, AN-B15 was isolated and determined to effectively remove Hg(II) under both nutrient-poor and nutrient-rich conditions via volatilization by transforming Hg(II) to Hg(0) and immobilization by transforming Hg(II) to mercury sulfide and Hg-sulfhydryl. Genome and transcriptome analyses revealed that the molecular mechanisms involved in Hg(II) resistance in AN-B15 were a collaborative process involving multiple metabolic systems at the transcriptional level. Under Hg(II) stress, AN-B15 upregulated genes involved in the mer operon and producing the reducing power to rapidly volatilize Hg(II), thereby decreasing its toxicity. Hydroponic culture experiments also revealed that inoculation with strain AN-B15 alleviated Hg-induced toxicity and reduced the uptake of Hg(II) in the roots of wheat seedlings, as explained by the volatilization and immobilization of Hg(II) and plant growth-promoting traits of AN-B15. Overall, the results from the in vitro assays provided vital information that are essential for understanding the mechanism of Hg(II) resistance in plant-associated bacteria, which can also be applied for the bioremediation of Hg-contamination in future.
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Affiliation(s)
- Junjun Chang
- Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, School of Ecology and Environmental Science, Yunnan University, Kunming 650091, China
| | - Zhengjian Yan
- Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, School of Ecology and Environmental Science, Yunnan University, Kunming 650091, China
| | - Jia Dong
- Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, School of Ecology and Environmental Science, Yunnan University, Kunming 650091, China
| | - Xinni Wu
- Institute of International Rivers and Eco-security, Yunnan University, Kunming 650091, China
| | - Zhuang Meng
- School of Agriculture, Yunnan University, Kunming 650091, China
| | - Yu Shi
- Institute of International Rivers and Eco-security, Yunnan University, Kunming 650091, China
| | - Jinquan Chen
- Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, School of Ecology and Environmental Science, Yunnan University, Kunming 650091, China.
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7
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Zanganeh F, Heidari A, Sepehr A, Rohani A. Bioaugmentation and bioaugmentation-assisted phytoremediation of heavy metal contaminated soil by a synergistic effect of cyanobacteria inoculation, biochar, and purslane (Portulaca oleracea L.). ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:6040-6059. [PMID: 34432211 DOI: 10.1007/s11356-021-16061-0] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 08/16/2021] [Indexed: 06/13/2023]
Abstract
In recent decades, soil contamination with heavy metals has become an environmental crisis due to their long-term stability and adverse biological effects. Therefore, bioremediation is an eco-friendly technology to remediate contaminated soil, which the efficiency requires further research. This study was designed to comparatively investigate two strategies: bioaugmentation by using a cyanobacterial species (Oscillatoria sp.) and bioaugmentation-assisted phytoremediation by using Oscillatoria sp. and purslane (Portulaca oleracea L.) for the bioremediation of soil contaminated by heavy metals (Cr (III), Cr (VI), Fe, Al, and Zn). Various quantities of biochar (0.5, 2, and 5% (w/w)) were used as an amendment in the experiments to facilitate the remediation process. The results of the bioaugmentation test showed that applying biochar and cyanobacteria into contaminated soil significantly increased the chlorophyll a, nitrogen, and organic carbon contents. In contrast, the extractable fractions of Cr (III), Cr (VI), Zn, Al, and Fe declined compared with those of the control treatment. The highest reduction content (up to 87 %) in the extractable portion was obtained for Cr (VI). The development of longer root and hypocotyl lengths and vigour index from lettuces and radish seeds grown in the remediated soil confirmed the success of remediation treatments. Moreover, the findings of the bioaugmentation-assisted phytoremediation test displayed a reduction in the bioavailable fraction of Cr (III), Cr (VI), Zn, Al, and Fe. Cr (III) presented the highest reduction (up to 90 %) in metal bioavailability. With cyanobacteria inoculation and biochar addition, the shoot and root lengths of purslane grew 4.6 and 3-fold while the heavy metal accumulation decreased significantly. Besides, these treatments enhanced the tolerance index (TI) quantities of purslane whereas diminished its bioaccumulation coefficient (BAC) and bioconcentration factor (BCF) values. For all heavy metals (except Zn), translocation factor (TF) and BAC values were found to be less than 1.0 at all treatments, indicating the successful phytoextraction by the purslane. These results suggest that the purslane can be considered an excellent phytoextracting agent for soils contaminated with heavy metals.
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Affiliation(s)
- Fahimeh Zanganeh
- Department of Environmental Science, Faculty of Natural Resources and Environment, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Ava Heidari
- Department of Environmental Science, Faculty of Natural Resources and Environment, Ferdowsi University of Mashhad, Mashhad, Iran.
| | - Adel Sepehr
- Department of Desert and Arid Zones Management, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Abbas Rohani
- Department of Biosystems Engineering, Faculty of Agriculture, Ferdowsi University of Mashhad, Mashhad, Iran
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Fang Q, Huang T, Wang N, Ding Z, Sun Q. Effects of Herbaspirillum sp. p5-19 assisted with alien soil improvement on the phytoremediation of copper tailings by Vetiveria zizanioides L. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:64757-64768. [PMID: 34318414 DOI: 10.1007/s11356-021-15091-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Accepted: 06/19/2021] [Indexed: 06/13/2023]
Abstract
Microbial assisted phytoremediation and reclamation are both potential contaminated soil remediation technologies, but little is known about the combined application of the two technologies on real contaminated soils. This study investigated the potential of Herbaspirillum sp. p5-19 (p5-19) assisted with alien soil improvement on improving stress tolerance and enhancing the accumulation of Mn, Cu, Zn, and Cd by Vetiveria zizanioides L. in copper tailings. Phytoremediation potential was evaluated by plant biomass and the ability of plants to absorb and transfer heavy metals. Results showed that the biomass was increased by 19.64-173.81% in p5-19 inoculation treatments with and without alien soil improvement compared with control. Meanwhile, photosynthetic pigment contents were enhanced in co-inoculation treatment (p5-19 with alien soil improvement). In addition, the malondialdehyde (MDA) content was decreased, and the activities of antioxidant enzymes such as ascorbate peroxidase (APX), superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were increased in p5-19 treatment, thereby alleviating the oxidative stress. Moreover, co-inoculation significantly (p < 0.05) increased the concentrations of Mn, Cu, Zn, and Cd in the roots and shoots of V. zizanioides. In particular, the highest concentrations of Mn, Zn, and Cd in the shoots (roots) were obtained in covering 10 cm combined with p5-19 inoculation treatment, which were 4.44- (2.71-), 4.73- (3.87-), and 5.93- (4.35-) fold as that of the controls, respectively. These results provided basis for the change of phytoremediation ability of V. zizanioides after inoculation. We concluded that p5-19 assisted with alien soil improvement was a potential strategy for enhancing phytoremediation ability in tailings.
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Affiliation(s)
- Qing Fang
- College of Resources and Environmental Engineering, Anhui University, Hefei, 230601, China
- Key Laboratory of Wetland Ecological Protection and Restoration, Hefei, China
- Mining Environmental Restoration and Wetland Ecological Security Collaborative Innovation Center, Hefei, China
| | - Tao Huang
- College of Resources and Environmental Engineering, Anhui University, Hefei, 230601, China
- Key Laboratory of Wetland Ecological Protection and Restoration, Hefei, China
- Mining Environmental Restoration and Wetland Ecological Security Collaborative Innovation Center, Hefei, China
| | - Ning Wang
- College of Resources and Environmental Engineering, Anhui University, Hefei, 230601, China
- Key Laboratory of Wetland Ecological Protection and Restoration, Hefei, China
- Mining Environmental Restoration and Wetland Ecological Security Collaborative Innovation Center, Hefei, China
| | - Ziwei Ding
- College of Resources and Environmental Engineering, Anhui University, Hefei, 230601, China
- Key Laboratory of Wetland Ecological Protection and Restoration, Hefei, China
- Mining Environmental Restoration and Wetland Ecological Security Collaborative Innovation Center, Hefei, China
| | - Qingye Sun
- College of Resources and Environmental Engineering, Anhui University, Hefei, 230601, China.
- Key Laboratory of Wetland Ecological Protection and Restoration, Hefei, China.
- Mining Environmental Restoration and Wetland Ecological Security Collaborative Innovation Center, Hefei, China.
- Academy of Resources and Environmental Engineering, Anhui University, 111 JiuLong Road, 523, Hefei, 230601, Anhui, People's Republic of China.
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9
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Guo Q, Ji J, Ling Z, Zhang K, Xu R, Leng X, Mao C, Zhou T, Wang H, Liu P, Li X. Bioaugmentation improves the anaerobic co-digestion of cadmium-containing plant residues and cow manure. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 289:117885. [PMID: 34388552 DOI: 10.1016/j.envpol.2021.117885] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2021] [Revised: 07/26/2021] [Accepted: 07/30/2021] [Indexed: 06/13/2023]
Abstract
Phytoremediation causes a large quantity of phytoremediation residues rich in heavy metals (HMs). This kind of plant residue can be used as a substrate for anaerobic digestion (AD) to reduce the content of HM-containing biomass, but high concentrations of HMs will inhibit the digestion efficiency and reduce the conversion efficiency of plant residues. Bioaugmentation may be an effective method to improve the degradation efficiency and methane yield of plant residues rich in HMs. In this study, a cellulose-degrading anaerobic bacteria Paracoccus sp. Termed strain LZ-G1 was isolated from cow dung, which can degrade cellulose and simultaneously adsorb Cd2+. The Cd2+ (10 mg/L)-adsorbtion efficiency and cellulose (463.12 g/kg)-degradation rate were 65.1 % and 60.59 %, respectively. In addition, using the strain LZ-G1 bioaugmented Cd2+-containing plant residues and cow manure mixed AD system, the system's biogas and methane production significantly increased (98.97 % and 142.03 %, respectively). During the AD process, the strain LZ-G1 was successfully colonized in the digestion system. Furthermore, the microbial community analysis revealed that LZ-G1 bioaugmentation alleviates the toxicity of free Cd2+ to the microbial community in the AD system, regulates and restores the archaea genus dominant in the methanogenesis stage, and restores the relative abundance of dominant bacteria associated with biomass hydrolysis. The restoration of the microbial community increased the biogas yield and methane production rate. Thus, bioaugmentation provides an easy and a feasible method for the actual on-site treatment of HM-rich phytoremediation residues.
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Affiliation(s)
- Qian Guo
- MOE Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, PR China
| | - Jing Ji
- MOE Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, PR China
| | - Zhenmin Ling
- MOE Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, PR China
| | - Kai Zhang
- MOE Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, PR China
| | - Rong Xu
- MOE Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, PR China
| | - Xiaoyun Leng
- MOE Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, PR China; Key Laboratory for Resources Utilization Technology of Unconventional Water of Gansu Province, Gansu Academy of Membrane Science and Technology, Duanjiatanlu #1272, Lanzhou, 730020, PR China
| | - Chunlan Mao
- MOE Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, PR China
| | - Tuoyu Zhou
- MOE Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, PR China
| | - Haoyang Wang
- McMaster University, 303-2, 1100 Main Street West, Hamilton, Ontario, Canada
| | - Pu Liu
- MOE Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, PR China
| | - Xiangkai Li
- MOE Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, Gansu, 730000, PR China; Key Laboratory for Resources Utilization Technology of Unconventional Water of Gansu Province, Gansu Academy of Membrane Science and Technology, Duanjiatanlu #1272, Lanzhou, 730020, PR China.
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10
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Sharma R, Jasrotia T, Kumar R, Kumar R, Alothman AA, Al-Anazy MM, Alqahtani KN, Umar A. Multi-biological combined system: A mechanistic approach for removal of multiple heavy metals. CHEMOSPHERE 2021; 276:130018. [PMID: 33714881 DOI: 10.1016/j.chemosphere.2021.130018] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 01/01/2021] [Accepted: 02/13/2021] [Indexed: 06/12/2023]
Abstract
In this work, interactions of diverse fungal species by the manipulation of cell concentrations has been utilized as the driving feature for the removal of hazardous multi-metals from the aqueous solutions. This study is focused on the exploitation of internal structures of microbes as a repository of lead (Pb(II)) and nickel (Ni(II)). For the concerned purpose 24 heavy metal resistant fungi are isolated from different industrial waste sites to form different microbial combinations as a single unit 'consortia' for achieving highest possible removal rates. Polymerase chain reaction and DNA sequencing are involved for the biochemical characterization and phylogenetic analysis of the screened isolates. The identification and screening studies reveal isolated strains as two Pb resistant fungi viz. K1SF-Pb15 (Aspergillus terreus) and SEF-Pb (Talaromyces islandicus) which have shown metal removal up to 93% and two Ni(II) tolerant fungal isolates namely, MEF-Ni-11 (Neurospora crassa) and Ni-1 (Aspergillus flavus) with removal efficiency of more than 91%. Relationship has been validated between the biosorption capacity and efficiency of the novel consortium under the influence of variable pH, time duration, initial concentration of Pb(II) and Ni(II), and inoculum size which has led to the foundation of effective and economical parameters for its exploitation in practical fields. The fungal consortia when applied on various industrial effluents has exhibited more than 95% of removal for both Pb(II) and Ni(II) simultaneously. The detailed mechanistic insight has shown the involvement of physical, chemical and ionic forces for the removal of heavy metals. So the designed novel multi-biological combined system acted as a repository for Pb(II) and Ni(II) ions with a greater potential which can be guided by the mechanistic methodology for the retrieval and remediation of multiple heavy metals from the real waste water samples.
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Affiliation(s)
- Rohit Sharma
- Department of Biotechnology, Maharishi Markandeshwar Deemed to Be University, Mullana (Ambala), 133207, Haryana, India
| | - Teenu Jasrotia
- Department of Environment Studies, Panjab University, Chandigarh, 160014, India; Department of Chemistry and Centre of Advanced Studies, Panjab University, Chandigarh, 160014, India
| | - Rajeev Kumar
- Department of Environment Studies, Panjab University, Chandigarh, 160014, India
| | - Raman Kumar
- Department of Biotechnology, Maharishi Markandeshwar Deemed to Be University, Mullana (Ambala), 133207, Haryana, India.
| | - Asma A Alothman
- Chemistry Department, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Murefah Mana Al-Anazy
- Department of Chemistry, College of Science, Princess Nourah Bint Abdulrahman University, Riyadh, 11671, Saudi Arabia
| | - Khadraa N Alqahtani
- Chemistry Department, College of Science, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Ahmad Umar
- Department of Chemistry, Faculty of Science and Arts and Promising Centre for Sensors and Electronic Devices (PCSED), Najran University, Najran, 11001, Saudi Arabia.
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11
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Han H, Wu X, Yao L, Chen Z. Heavy metal-immobilizing bacteria combined with calcium polypeptides reduced the uptake of Cd in wheat and shifted the rhizosphere bacterial communities. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 267:115432. [PMID: 32841909 DOI: 10.1016/j.envpol.2020.115432] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 08/12/2020] [Accepted: 08/12/2020] [Indexed: 06/11/2023]
Abstract
In situ stabilization techniques for the "remediation" of heavy metal-contaminated soil are a novel and inexpensive technology. However, the mechanisms underlying the interaction of exogenous passivators with the bacterial community in wheat rhizosphere soil remain unclear. Soil static culture and pot experiments were conducted to evaluate the effects and mechanisms of the heavy metal-immobilizing bacterium Enterobacter bugandensis TJ6 and calcium polypeptides (CPPs) and their association with Cd uptake in wheat, soil quality and the rhizobacterial community structure. The results showed that compared with the control treatment (CK), the TJ6, CPP, and TJ6+CPP treatments significantly decreased the diethylenetriaminepentaacetic acid (DTPA)-extractable Cd (25.2%-60.1%) content and increased the pH, organic matter content and urease activity in the wheat rhizosphere soil, which resulted in decreases in the Cd (21.5%-77.8%) content in wheat tissues (grain, straw, and roots). In particular, the TJ6+CPP treatment was more effective at decreasing Cd accumulation in grains. Furthermore, the TJ6+CPP treatment improved the diversity of the soil bacterial community in the wheat rhizosphere, and the relative abundances of Proteobacteria, Firmicutes, Arthrobacter, Microvirga, Ensifer, Brevundimonas, Devosia and Pedobacter were enriched. These results suggest that the TJ6+CPP treatment decreased the uptake of Cd in wheat by i) providing essential elements (N and C sources), ii) increasing the pH and reducing the bioavailable Cd content in wheat rhizosphere soil, iii) allowing colonization to promote plant growth and Cd-resistant bacteria, and iv) increasing the abundance of genes associated with ABC transporters, carbon metabolism and oxidative phosphorylation in the rhizosphere bacterial community. Our results showed that the heavy metal-immobilizing bacterium TJ6 combined with CPPs decreased the Cd content and increased the bacterial community diversity of wheat rhizosphere soil. Our results also highlight the potential of using heavy metal-immobilizing bacteria and CPPs to ensure the safe production of crops growing on heavy metal-polluted soils.
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Affiliation(s)
- Hui Han
- Collaborative Innovation of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang, 473061, PR China
| | - Xuejiao Wu
- Collaborative Innovation of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang, 473061, PR China
| | - Lunguang Yao
- Collaborative Innovation of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang, 473061, PR China
| | - Zhaojin Chen
- Collaborative Innovation of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang, 473061, PR China.
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12
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Chang J, Shi Y, Si G, Yang Q, Dong J, Chen J. The bioremediation potentials and mercury(II)-resistant mechanisms of a novel fungus Penicillium spp. DC-F11 isolated from contaminated soil. JOURNAL OF HAZARDOUS MATERIALS 2020; 396:122638. [PMID: 32361297 DOI: 10.1016/j.jhazmat.2020.122638] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2020] [Revised: 03/29/2020] [Accepted: 04/01/2020] [Indexed: 05/20/2023]
Abstract
Bioremediation of Hg-contaminated soil using microbe-based strategies is a promising and efficient method as it is inexpensive and not harmful to the environment. In this study, a novel Hg(II)-volatilizing fungus Penicillium spp., DC-F11 was isolated and showed bioremediation potential for reducing Hg(II) phytotoxicity, total Hg, and exchangeable Hg in Hg(II)-polluted soil. Subsequently, the mechanisms of Hg(II) volatilization and resistance involved were investigated using multiple complementary techniques. The fungal cells could detoxify Hg(II) by extracellular sequestration via adsorption and precipitation. Moreover, a comparative transcriptome analysis uncovered the primary intracellular adaptive responses of the DC-F11 to Hg(II) stress, including mer-mediated detoxification system, thiol compound metabolism, and oxidative stress defense and damage repair metabolism. These results showed that the resistance of DC-F11 to Hg(II) was generally a multisystem collaborative process. Here, we report, for the first time, that the mer-mediated detoxification system was responsible for Hg(II) volatilization in fungus. These findings provide a better understanding of the mechanisms involved in Hg(II) volatilization and resistance that occur in fungi and also provide a strong theoretical basis for the future application of fungi in the bioremediation of Hg-polluted environments.
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Affiliation(s)
- Junjun Chang
- Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming, 650091, China; Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming, 650091, China; International Cooperative Center of Plateau Lake Ecological Restoration and Watershed Management of Yunnan, Kunming, 650091, China
| | - Yu Shi
- Institute of International Rivers and Eco-security, Yunnan University, Kunming, 650091, China
| | - Guangzheng Si
- Institute of International Rivers and Eco-security, Yunnan University, Kunming, 650091, China
| | - Qingchen Yang
- Institute of International Rivers and Eco-security, Yunnan University, Kunming, 650091, China
| | - Jia Dong
- Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming, 650091, China
| | - Jinquan Chen
- Institute for Ecological Research and Pollution Control of Plateau Lakes, School of Ecology and Environmental Science, Yunnan University, Kunming, 650091, China; Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming, 650091, China; International Cooperative Center of Plateau Lake Ecological Restoration and Watershed Management of Yunnan, Kunming, 650091, China.
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13
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Rahman Z, Singh VP. Bioremediation of toxic heavy metals (THMs) contaminated sites: concepts, applications and challenges. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:27563-27581. [PMID: 32418096 DOI: 10.1007/s11356-020-08903-0] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 04/15/2020] [Indexed: 06/11/2023]
Abstract
Heavy metal contamination is a global issue, where the prevalent contaminants are arsenic (As), cadmium (Cd), chromium (Cr)(VI), mercury (Hg), and lead (Pb). More often, they are collectively known as "most problematic heavy metals" and "toxic heavy metals" (THMs). Their treatment through a variety of biological processes is one of the prime interests in remediation studies, where heavy metal-microbe interaction approaches receive high interest for their cost effective and ecofriendly solutions. In this review, we provide an up to date information on different microbial processes (bioremediation) for the removal of THMs. For the same, emphasis is put on oxidation-reduction, biomineralization, bioprecipitation, bioleaching, biosurfactant technology, biovolatilization, biosorption, bioaccumulation, and microbe-assisted phytoremediation with their selective advantages and disadvantages. Further, the literature briefly discusses about the various setups of cleaning processes of THMs in environment under ex situ and in situ applications. Lately, the study sheds light on the manipulation of microorganisms through genetic engineering and nanotechnology for their advanced treatment approaches.
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Affiliation(s)
- Zeeshanur Rahman
- Department of Botany, Zakir Husain Delhi College, University of Delhi, Delhi, India.
- Department of Botany, University of Delhi, Delhi, India.
| | - Ved Pal Singh
- Department of Botany, University of Delhi, Delhi, India
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14
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Liu H, Xie Y, Li J, Zeng G, Li H, Xu F, Feng S, Xu H. Effect of Serratia sp. K3 combined with organic materials on cadmium migration in soil-vetiveria zizanioides L. system and bacterial community in contaminated soil. CHEMOSPHERE 2020; 242:125164. [PMID: 31669989 DOI: 10.1016/j.chemosphere.2019.125164] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 10/10/2019] [Accepted: 10/20/2019] [Indexed: 06/10/2023]
Abstract
Phytoremediation is an economical strategy to harvest cadmium (Cd) from contaminated soil, but the efficiency of phytoremediation was affected by many factors. This study investigated the potential of Serratia sp. K3 (K3) assisted with straw biogas residue (SBR) or leavening fertilizer (LF) on improving the Cd migration efficiency and micro-environment in soil-vetiveria zizanioides L. system. The results showed that the acid soluble Cd in soil was increased by 2.83-29.79% in treatments compared with control (CK). In addition, Cd accumulation in the roots and shoots of vetiveria zizanioides were significantly enhanced by the combination of K3 and SBR/LF. Especially, the translocation factor of Cd increased by 21.53-62.37% in groups with K3 compared with the groups without K3, correspondingly. Furthermore, SBR/LF effectively changed bacterial community structure, and improved bacterial abundance. Relative abundance of functional genes related with carbohydrate/energy/amino acid metabolism were increased in groups of SBRB/LFB rhizosphere compared with CK. These results provide insight into the change of phytoremediation efficiency and soil bacterial communities in the vetiveria zizanioides rhizosphere after inoculation. This study may provide a promising method for improving phytoremediation in Cd contaminated soil.
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Affiliation(s)
- Huakang Liu
- Key Laboratory of Bio-resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610065, Sichuan, China
| | - Yanluo Xie
- Key Laboratory of Bio-resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610065, Sichuan, China
| | - Junjie Li
- Key Laboratory of Bio-resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610065, Sichuan, China
| | - Guoquan Zeng
- Key Laboratory of Bio-resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610065, Sichuan, China
| | - Hao Li
- Key Laboratory of Bio-resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610065, Sichuan, China
| | - Fei Xu
- Key Laboratory of Bio-resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610065, Sichuan, China
| | - Su Feng
- Key Laboratory of Bio-resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610065, Sichuan, China.
| | - Heng Xu
- Key Laboratory of Bio-resource and Eco-Environment of Ministry of Education, College of Life Sciences, Sichuan University, Chengdu, 610065, Sichuan, China.
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15
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Pogrzeba M, Rusinowski S, Krzyżak J, Szada-Borzyszkowska A, McCalmont JP, Zieleźnik-Rusinowska P, Słaboń N, Sas-Nowosielska A. Dactylis glomerata L. cultivation on mercury contaminated soil and its physiological response to granular sulphur aided phytostabilization. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 255:113271. [PMID: 31550655 DOI: 10.1016/j.envpol.2019.113271] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 08/27/2019] [Accepted: 09/17/2019] [Indexed: 06/10/2023]
Abstract
Most mercury (Hg) deposition in the environment results from anthropogenic inputs, Chlor-Alkali Plants (CAPs) particularly had a significant Hg impact on the environment at a regional scale. Exposure to mercury compounds resulting in various toxic effects for living organisms. The aim of this study was to investigate the capacity of granular sulphur (S) soil amendment and cultivation of Dactylis glomerata to decrease gaseous mercury emission to the atmosphere and mercury mobility in soils affected by CAP activity in the past. The effect of this approach on D. glomerata physiological status was also assessed (Hg concentration in biomass, chlorophyll a fluorescence, pigment contents and oxidative stress). Stabilization of mercury in soil and reduction of root and shoot concentration did not influence biomass production. Despite similar yields, photosynthetic efficiency was higher for plants grown in sulphur amended soil compared to unamended soil, particularly observed in phenomenological energy fluxes. Relative chlorophyll content was 30% lower for amended soil plants, however based on chlorophyll fluorescence data those were in high portion ineffective. Oxidative stress products and catalase activity did not differ significantly between experimental treatments. Sulphur amendment was a key factor for reduction of Hg mobility in soil (reduced by about 30%) while plant cover was significant for the reduction of Hg atmospheric emission (emissions were 2-times higher in sulphur amended soil without plant cover). Due to the very high concentration of Hg in soil (798.2 ± 7.3 mg kg-1), growth inhibition was consistent regardless of treatment, demonstrated in the overload Reactive Oxygen Species scavenging mechanism and similar biomass yields. This leads to the conclusion that Hg may have greater impact on Calvin-Benson cycle associated enzymes than on the light-dependent photosynthesis phase. Despite these limitations this approach may still decrease environmental risks by reducing Hg emission to the atmosphere and reducing groundwater contamination.
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Affiliation(s)
- Marta Pogrzeba
- Institute for Ecology of Industrial Areas, 6 Kossutha St., 40-844, Katowice, Poland.
| | - Szymon Rusinowski
- Institute for Ecology of Industrial Areas, 6 Kossutha St., 40-844, Katowice, Poland
| | - Jacek Krzyżak
- Institute for Ecology of Industrial Areas, 6 Kossutha St., 40-844, Katowice, Poland
| | | | - Jon Paul McCalmont
- College of Life and Environmental Sciences, Exeter University, United Kingdom
| | - Paulina Zieleźnik-Rusinowska
- Department of Plant Physiology, Faculty of Biology and Environmental Protection, University of Silesia in Katowice, 28 Jagiellońska Street, 40-032, Katowice, Poland
| | - Norbert Słaboń
- Institute for Ecology of Industrial Areas, 6 Kossutha St., 40-844, Katowice, Poland
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16
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Chang J, Yang Q, Dong J, Ji B, Si G, He F, Li B, Chen J. Reduction in Hg phytoavailability in soil using Hg-volatilizing bacteria and biochar and the response of the native bacterial community. Microb Biotechnol 2019; 12:1014-1023. [PMID: 31241863 PMCID: PMC6681405 DOI: 10.1111/1751-7915.13457] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2018] [Revised: 04/23/2019] [Accepted: 06/14/2019] [Indexed: 01/02/2023] Open
Abstract
Biological approaches are considered promising and eco-friendly strategies to remediate Hg contamination in soil. This study investigated the potential of two 'green' additives, Hg-volatilizing bacteria (Pseudomonas sp. DC-B1 and Bacillus sp. DC-B2) and sawdust biochar, and their combination to reduce Hg(II) phytoavailability in soil and the effect of the additives on the soil bacterial community. The results showed that the Hg(II) contents in soils and lettuce shoots and roots were all reduced with these additives, achieving more declines of 12.3-27.4%, 24.8-57.8% and 2.0-48.6%, respectively, within 56 days of incubation compared to the control with no additive. The combination of DC-B2 and 4% biochar performed best in reducing Hg(II) contents in lettuce shoots, achieving a decrease of 57.8% compared with the control. Pyrosequencing analysis showed that the overall bacterial community compositions in the soil samples were similar under different treatments, despite the fact that the relative abundance of dominant genera altered with the additives, suggesting a relatively weak impact of the additives on the soil microbial ecosystem. The low relative abundances of Pseudomonas and Bacillus, close to the background levels, at the end of the experiment indicated a small biological disturbance of the local microbial niche by the exogenous bacteria.
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Affiliation(s)
- Junjun Chang
- School of Ecology and Environmental Science and Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded EnvironmentsYunnan UniversityKunming 650091China
| | - Qingchen Yang
- Institute of International Rivers and Eco‐securityYunnan UniversityKunmingYunnan 650091China
| | - Jia Dong
- School of Ecology and Environmental Science and Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded EnvironmentsYunnan UniversityKunming 650091China
| | - Bohua Ji
- Institute of International Rivers and Eco‐securityYunnan UniversityKunmingYunnan 650091China
| | - Guangzheng Si
- Institute of International Rivers and Eco‐securityYunnan UniversityKunmingYunnan 650091China
| | - Fang He
- Institute of International Rivers and Eco‐securityYunnan UniversityKunmingYunnan 650091China
| | - Benyan Li
- School of Ecology and Environmental Science and Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded EnvironmentsYunnan UniversityKunming 650091China
| | - Jinquan Chen
- School of Ecology and Environmental Science and Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded EnvironmentsYunnan UniversityKunming 650091China
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17
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Chang J, Duan Y, Dong J, Shen S, Si G, He F, Yang Q, Chen J. Bioremediation of Hg-contaminated soil by combining a novel Hg-volatilizing Lecythophora sp. fungus, DC-F1, with biochar: Performance and the response of soil fungal community. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 671:676-684. [PMID: 30939320 DOI: 10.1016/j.scitotenv.2019.03.409] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 03/21/2019] [Accepted: 03/26/2019] [Indexed: 06/09/2023]
Abstract
Reducing Hg contamination in soil using eco-friendly approaches has attracted increasing attention in recent years. In this study, a novel multi-metal-resistant Hg-volatilizing fungus belonging to Lecythophora sp., DC-F1, was isolated from multi-metal-polluted mining-area soil, and its performance in reducing Hg bioavailability in soil when used in combination with biochar was investigated. The isolate displayed a minimum inhibitory concentration of 84.5mg·L-1 for Hg(II) and volatilized >86% of Hg(II) from LB liquid medium with an initial concentration of 7.0mg·L-1 within 16h. Hg(II) contents in soils and grown lettuce shoots decreased by 13.3-26.1% and 49.5-67.7%, respectively, with DC-F1 and/or biochar addition compared with a control over 56days of incubation. Moreover, treatment with both bioagents achieved the lowest Hg content in lettuce shoots. Hg presence and DC-F1 addition significantly decreased the number of fungal ITS gene copies in soils. High-throughput sequencing showed that the soil fungal community compositions were more largely influenced by DC-F1 addition than by biochar addition, with the proportion of Mortierella increasing and those of Penicillium and Thielavia decreasing with DC-F1 addition. Developing the coupling of Lecythophora sp. DC-F1 with biochar into a feasible approach for the recovery of Hg-contaminated soils is promising.
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Affiliation(s)
- Junjun Chang
- School of Ecology and Environmental Science, Yunnan University, Kunming 650091, PR China
| | - Yijun Duan
- Yunnan Institute of Environmental Science (Kunming China International Research Center for Plateau Lakes), Kunming 650034, PR China
| | - Jia Dong
- School of Ecology and Environmental Science, Yunnan University, Kunming 650091, PR China
| | - Shili Shen
- School of Ecology and Environmental Science, Yunnan University, Kunming 650091, PR China
| | - Guangzheng Si
- School of Ecology and Environmental Science, Yunnan University, Kunming 650091, PR China; Institute of International Rivers and Eco-security, Yunnan University, Kunming, Yunnan 650091, PR China
| | - Fang He
- School of Ecology and Environmental Science, Yunnan University, Kunming 650091, PR China; Institute of International Rivers and Eco-security, Yunnan University, Kunming, Yunnan 650091, PR China
| | - Qingchen Yang
- School of Ecology and Environmental Science, Yunnan University, Kunming 650091, PR China; Institute of International Rivers and Eco-security, Yunnan University, Kunming, Yunnan 650091, PR China
| | - Jinquan Chen
- School of Ecology and Environmental Science, Yunnan University, Kunming 650091, PR China.
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18
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O'Connor D, Hou D, Ok YS, Mulder J, Duan L, Wu Q, Wang S, Tack FMG, Rinklebe J. Mercury speciation, transformation, and transportation in soils, atmospheric flux, and implications for risk management: A critical review. ENVIRONMENT INTERNATIONAL 2019; 126:747-761. [PMID: 30878870 DOI: 10.1016/j.envint.2019.03.019] [Citation(s) in RCA: 170] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2018] [Revised: 02/13/2019] [Accepted: 03/08/2019] [Indexed: 05/24/2023]
Abstract
Mercury (Hg) is a potentially harmful trace element in the environment and one of the World Health Organization's foremost chemicals of concern. The threat posed by Hg contaminated soils to humans is pervasive, with an estimated 86 Gg of anthropogenic Hg pollution accumulated in surface soils worldwide. This review critically examines both recent advances and remaining knowledge gaps with respect to cycling of mercury in the soil environment, to aid the assessment and management of risks caused by Hg contamination. Included in this review are factors affecting Hg release from soil to the atmosphere, including how rainfall events drive gaseous elemental mercury (GEM) flux from soils of low Hg content, and how ambient conditions such as atmospheric O3 concentration play a significant role. Mercury contaminated soils constitute complex systems where many interdependent factors, including the amount and composition of soil organic matter and clays, oxidized minerals (e.g. Fe oxides), reduced elements (e.g. S2-), as well as soil pH and redox conditions affect Hg forms and transformation. Speciation influences the extent and rate of Hg subsurface transportation, which has often been assumed insignificant. Nano-sized Hg particles as well as soluble Hg complexes play important roles in soil Hg mobility, availability, and methylation. Finally, implications for human health and suggested research directions are put forward, where there is significant potential to improve remedial actions by accounting for Hg speciation and transportation factors.
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Affiliation(s)
- David O'Connor
- School of Environment, and State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing 100084, China; National Engineering Laboratory for Site Remediation Technologies, China
| | - Deyi Hou
- School of Environment, and State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing 100084, China; National Engineering Laboratory for Site Remediation Technologies, China.
| | - Yong Sik Ok
- Korea Biochar Research Center, OJeong Eco-Resilience Institute & Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Republic of Korea
| | - Jan Mulder
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, P.O. Box 5003, 1432 Ås, Norway
| | - Lei Duan
- School of Environment, and State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing 100084, China
| | - Qingru Wu
- School of Environment, and State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing 100084, China
| | - Shuxiao Wang
- School of Environment, and State Key Joint Laboratory of Environmental Simulation and Pollution Control, Tsinghua University, Beijing 100084, China
| | - Filip M G Tack
- Department of Green Chemistry and Technology, Ghent University, Coupure Links 653, 9000 Ghent, Belgium
| | - Jörg Rinklebe
- University of Wuppertal, School of Architecture and Civil Engineering, Institute of Foundation Engineering, Water- and Waste-Management, Laboratory of Soil- and Groundwater-Management, Pauluskirchstraße 7, Wuppertal 42285, Germany; Department of Environment, Energy and Geoinformatics, Sejong University, 98 Gunja-Dong, Seoul, Republic of Korea
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19
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de Araújo LCA, da Purificação-Júnior AF, da Silva SM, Lopes ACS, Veras DL, Alves LC, Dos Santos FB, Napoleão TH, Dos Santos Correia MT, da Silva MV, Oliva MLV, de Oliveira MBM. In vitro evaluation of mercury (Hg 2+) effects on biofilm formation by clinical and environmental isolates of Klebsiella pneumoniae. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 169:669-677. [PMID: 30500736 DOI: 10.1016/j.ecoenv.2018.11.036] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 11/05/2018] [Accepted: 11/09/2018] [Indexed: 06/09/2023]
Abstract
The increase in urbanization and industrialization has contributed to the contamination of different environments by means of xenobiotic compounds, such as heavy metals, causing changes in microbial communities. Among these metals, the Mercury (Hg2+) is one the most prevalent toxic metals for the environment The present study aimed to evaluate the effect of mercury on the formation of biofilm by environmental (collected from urban stream water) and clinical isolates of Klebsiella pneumoniae. In addition, antibiotic resistance, virulence factors, and genetic diversity were investigated. Taxonomic identity of eight isolates (one reference, two clinical, and five environmental isolates) was performed by MALDI-TOF-MS, while the antibiotic susceptibility profile was assessed by the disc diffusion method. The ability to form biofilms was evaluated by culture on Congo red agar and by crystal violet staining. Biofilm structure was analyzed by scanning electron microscopy. The hydrophobicity profile and the presence of the virulence genes cps, fimH, and mrkD was investigated. The presence of merA and its relationship with antimicrobial resistance were also assessed. The identity of all isolates was confirmed by MALDI-TOF-MS, and different profiles of resistance to mercury and antibiotics as well as of biofilm formation were identified for the clinical and environmental isolates. All isolates were hydrophilic and positive for the virulence genes cps, fimH, and mrkD; only the clinical isolate K36-A2 was positive for merA. The diversity of the isolates was confirmed by ERIC-PCR, which revealed high heterogeneity among the isolates. In conclusion, the data demonstrate that the investigated isolates present different responses to exposure to Hg2+ and correspond to distinct populations of K. pneumoniae disseminated in the investigated environment. The data obtained in this work will aid in understanding the mechanisms of survival of this pathogen under adverse conditions.
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Affiliation(s)
| | | | - Sivoneide Maria da Silva
- Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, Pernambuco, Brazil
| | - Ana Catarina Souza Lopes
- Departamento de Medicina Tropical, Centro de Ciências da Saúde, Universidade Federal de Pernambuco, Pernambuco, Brazil
| | - Dyana Leal Veras
- Departamento de Parasitologia, Centro de Pesquisas Aggeu Magalhães, Fundação Oswaldo Cruz, Pernambuco, Brazil
| | - Luiz Carlos Alves
- Departamento de Parasitologia, Centro de Pesquisas Aggeu Magalhães, Fundação Oswaldo Cruz, Pernambuco, Brazil
| | - Fábio Brayner Dos Santos
- Departamento de Parasitologia, Centro de Pesquisas Aggeu Magalhães, Fundação Oswaldo Cruz, Pernambuco, Brazil
| | - Thiago Henrique Napoleão
- Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, Pernambuco, Brazil
| | | | - Márcia Vanusa da Silva
- Departamento de Bioquímica, Centro de Biociências, Universidade Federal de Pernambuco, Pernambuco, Brazil
| | - Maria Luiza Vilela Oliva
- Departamento de Bioquímica, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, Brazil
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Oladipo OG, Burt AF, Maboeta MS. Effect of Bacillus cereus on the ecotoxicity of metal-based fungicide spiked soils: Earthworm bioassay. ECOTOXICOLOGY (LONDON, ENGLAND) 2019; 28:37-47. [PMID: 30430303 DOI: 10.1007/s10646-018-1997-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 10/26/2018] [Indexed: 06/09/2023]
Abstract
Soil microorganisms exhibit varying levels of metal tolerance across a diverse range of environmental conditions. The use of metal-based fungicides such as mancozeb and copper oxychloride could potentially result in increased levels of manganese, zinc and copper which may adversely affect soil mesofauna. Under standardized earthworm bioassay conditions (temperature, pH, soil type and water content), we investigated the effect of Bacillus cereus on mancozeb and copper oxychloride ecotoxicity towards Eisenia andrei. A metal-tolerant Bacillus cereus strain previously isolated from a gold mining site was introduced into fungicide spiked soils. Earthworms were exposed to bacterial inoculated and non-inoculated substrates of mancozeb (8, 44, 800 and 1250 mg kg-1) and copper oxychloride (200, 450, 675 and 1000 mg kg-1). Experimental trials assessed avoidance-behavior, growth and reproduction utilizing standardized protocols (ISO and OECD). In the avoidance-behavior, E. andrei showed significant (p< 0.05) preference for inoculated substrates. Further, significant (p< 0.05) increases in biomass, survival, cocoons, juveniles and lower soil and tissue Mn, Cu and Zn contents were recorded at 8 and 44 mg kg-1 mancozeb and copper oxychloride 200 and 450 mg kg-1 inoculated soils compared to non-inoculated. However, at 800 and 1250 mg kg-1 mancozeb and 675 and 1000 mg kg-1 copper oxychloride concentrations, reproductive success in both inoculated and non-inoculated treatments was negatively (p< 0.05) affected. In conclusion, Bacillus cereus decreased the ecotoxicity of metal-based fungicides towards Eisenia andrei at 8 and 44 mg kg-1 mancozeb and 200 and 450 mg kg-1 copper oxychloride concentrations. The outcome observed with the inoculated substrates at elevated fungicides concentrations maybe as a result of the environmental conditions (pH and temperature).
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Affiliation(s)
- Oluwatosin G Oladipo
- Unit for Environmental Sciences and Management, North West University, Potchefstroom, Private Bag X6001, Potchefstroom, 2520, South Africa
| | - Adam F Burt
- Unit for Environmental Sciences and Management, North West University, Potchefstroom, Private Bag X6001, Potchefstroom, 2520, South Africa
| | - Mark S Maboeta
- Unit for Environmental Sciences and Management, North West University, Potchefstroom, Private Bag X6001, Potchefstroom, 2520, South Africa.
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21
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Ji H, Zhang Y, Bararunyeretse P, Li H. Characterization of microbial communities of soils from gold mine tailings and identification of mercury-resistant strain. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 165:182-193. [PMID: 30196000 DOI: 10.1016/j.ecoenv.2018.09.011] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 08/26/2018] [Accepted: 09/01/2018] [Indexed: 05/27/2023]
Abstract
To enrich the understanding of the complex environmental system of soil and microorganisms in gold tailings, we studied the effects of environmental factors on the microbial community diversity in gold mine tailing soil in Beijing, and the strains screened from the soil with serious mercury (Hg) pollution. The results showed that microbial diversity and community composition varied among sites, and at varying depths, soil microbes were significantly affected by soil environmental factors such as lead (Pb), Hg, pH, and total organic carbon (TOC). Pb and Hg negatively affected soil microbial diversity, and less-polluted soil showed increased microbial diversities and complex community structure. Community composition analysis showed that Firmicutes, Proteobacteria and Actinobacteria were the dominant microorganisms. Moreover, Hg-resistant bacterial species isolated from soil samples were identified as Pseudomonas plecoglossicida with a high Hg tolerance efficiency. This study is important in understanding the microbial diversity and function in gold mine tailing soils and can widen the application for bioremediation process.
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Affiliation(s)
- Hongbing Ji
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China; Beijing Municipal Key Laboratory of Resource Environment and GIS, College of Resource Environment and Tourism, Capital Normal University, Beijing 100048, China.
| | - Yan Zhang
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Prudence Bararunyeretse
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
| | - Hongxia Li
- Beijing Key Laboratory of Resource-oriented Treatment of Industrial Pollutants, School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China
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Chen J, Dong J, Chang J, Guo T, Yang Q, Jia W, Shen S. Characterization of an Hg(II)-volatilizing Pseudomonas sp. strain, DC-B1, and its potential for soil remediation when combined with biochar amendment. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 163:172-179. [PMID: 30053587 DOI: 10.1016/j.ecoenv.2018.07.071] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2018] [Revised: 07/12/2018] [Accepted: 07/19/2018] [Indexed: 06/08/2023]
Abstract
Hg contamination is a critical environmental problem, and its remediation using cost-effective and environmentally friendly methods is highly desirable. In this study, a multi-metal-resistant bacterium showing strong Hg(II) volatilization ability, Pseudomonas sp. DC-B1, was isolated from heavy metal-contaminated soils. DC-B1 volatilized 81.1%, 79.2% and 74.3% of the initial Hg2+ from culture solutions with initial Hg2+ concentrations of 5.1, 10.4, and 15.7 mg/L, respectively, within 24 h. Microcosm experiments were performed to investigate the remediation of Hg(II)-spiked soils inoculated with DC-B1 coupled with sawdust biochar amendment. The efficiency of Hg removal from two types of soil samples with different properties and an initial Hg(II) content of approximately 100 mg/kg was enhanced 5.7-13.1% by bio-augmentation with inoculation of the bacterial strain DC-B1, 5.4-10.7% by amendment of 4% (w/w) biochar, and 10.7-23.2% by the combination of DC-B1 and biochar amendments over an incubation period of 24 d over the efficiency in the control treatment under flooded conditions. Longer root lengths were observed in lettuce grown in the treated soils than in lettuce from the control soil, confirming the bioremediation efficacy of the two bioagents for soil Hg contamination.
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Affiliation(s)
- Jinquan Chen
- School of Ecology and Environmental Science & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming 650091, China
| | - Jia Dong
- School of Ecology and Environmental Science & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming 650091, China
| | - Junjun Chang
- School of Ecology and Environmental Science & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming 650091, China.
| | - Tongtong Guo
- Institute of International Rivers and Eco-security, Yunnan University, Kunming, Yunnan 650091, China
| | - Qingchen Yang
- Institute of International Rivers and Eco-security, Yunnan University, Kunming, Yunnan 650091, China
| | - Wei Jia
- School of Architecture and Planning, Yunnan University, Kunming 650091, China
| | - Shili Shen
- School of Ecology and Environmental Science & Yunnan Key Laboratory for Plateau Mountain Ecology and Restoration of Degraded Environments, Yunnan University, Kunming 650091, China.
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O'Connor D, Peng T, Li G, Wang S, Duan L, Mulder J, Cornelissen G, Cheng Z, Yang S, Hou D. Sulfur-modified rice husk biochar: A green method for the remediation of mercury contaminated soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 621:819-826. [PMID: 29202293 DOI: 10.1016/j.scitotenv.2017.11.213] [Citation(s) in RCA: 121] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 09/05/2017] [Accepted: 11/18/2017] [Indexed: 05/28/2023]
Abstract
Mercury (Hg) contamination of surface soils has increased by ~86Giga grams due to anthropogenic activities. There is an urgent need to find new, effective and preferably 'green' remediation technologies to protect human health and the environment. Sulfur-modification of sorbents can greatly enhance Hg sorption capacity - by forming low solubility HgS (cinnabar). However, S-modified sorbents are not considered suitable for soil remediation due to the economic cost and secondary environmental impacts of sorbents such as granulated activated carbon (GAC), and the toxicity of S-modifiers such as thiol compounds. It was previously found that if biochar is used as an alternative to GAC then the overall environmental impact can be significantly reduced. However, due to a lack of experimental evidence, the practicality of S-modified biochar remains uncertain. The present study was undertaken to provide a proof-of-concept for the 'green' remediation of Hg contaminated soils with rice husk biochar modified with non-toxic elemental S. It was found that the S modification process increased the biochar S content from 0.2% to 13.04% via surface deposition or volume pore filling. This increased the biochar's Hg2+ adsorptive capacity (Qmax) by ~73%, to 67.11mg/g. To assess the performance of S-modified rice husk biochar for soil remediation it was applied to a high 1000mg/kg Hg2+ contaminated soil. Treatment dosages of 1%, 2% and 5% (dry wt.) were found to reduce freely available Hg in TCLP (toxicity characterization leaching procedure) leachates by 95.4%, 97.4% and 99.3%, respectively, compared to untreated soil. In comparison, unmodified rice husk biochar reduced Hg concentrations by 94.9%, 94.9% and 95.2% when applied at the same treatment dosage rates, respectively. This study has revealed that S-modified rice husk biochar has potential to stabilize Hg as a 'green' method for the remediation of contaminated soils.
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Affiliation(s)
- David O'Connor
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Tianyue Peng
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Guanghe Li
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Shuxiao Wang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China; State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex, Beijing 100084, China
| | - Lei Duan
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Jan Mulder
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, 1432 Aas, Norway
| | - Gerard Cornelissen
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, 1432 Aas, Norway; Norwegian Geotechnical Institute, N-0855 Oslo, Norway
| | - Zhenglin Cheng
- School of Environment, Tsinghua University, Beijing 100084, China
| | - Shengmao Yang
- Engineering Research Center of Biochar of Zhejiang Province, Hangzhou 310021, China; Institute of Environment, Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Deyi Hou
- School of Environment, Tsinghua University, Beijing 100084, China.
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Sheng H, Harir M, Boughner LA, Jiang X, Schmitt-Kopplin P, Schroll R, Wang F. N-acyl-homoserine lactone dynamics during biofilm formation of a 1,2,4-trichlorobenzene mineralizing community on clay. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 605-606:1031-1038. [PMID: 28697551 DOI: 10.1016/j.scitotenv.2017.06.233] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Revised: 06/25/2017] [Accepted: 06/26/2017] [Indexed: 06/07/2023]
Abstract
In Gram-negative bacteria, quorum sensing systems are based on the N-acyl-homoserine lactone (AHL) molecule. The objective of this study was to investigate the role of quorum sensing systems during biofilm formation by a microbial community while degrading the pollutant. Our model system included 1,2,4-trichlorobenzene (1,2,4-TCB) and its mineralizing Gram-negative bacterial community to investigate the relationships between AHL dynamics, cell growth and pollutant degradation. Biomineralization of 1,2,4-TCB was monitored for both the planktonic bacterial community with and without sterile clay particles in liquid cultures. The bacterial growth and production of AHLs were quantified by fluorescent in situ hybridization and immunoassay analysis, respectively. A rapid production of AHLs which occurred coincided with the biofilm formation and the increase of mineralization rate of 1,2,4-TCB in liquid cultures. There is a positive correlation between the cell density of Bodertella on the clay particles and mineralization rate of 1,2,4-TCB. 3-oxo-C12:1-HSL appears to be the dominant AHL with the highest intensity and rapidly degraded by the bacterial community via two main consecutive reactions (lactone hydrolysis and decarboxylic reaction). These findings suggest that the integrated AHLs and their degraded products play a crucial role in biofilm formation and biomineralization of 1,2,4-TCB in culture.
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Affiliation(s)
- Hongjie Sheng
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Mourad Harir
- Helmholtz Zentrum München, German Research Center for Environmental Health, Research Unit Analytical BioGeoChemistry, Ingolstaedter Landstrasse 1, D-85764 Neuherberg, Germany; Chair of Analytical Food Chemistry, Technische Universität München, D-85354 Freising-Weihenstephan, Germany
| | - Lisa A Boughner
- Department of Plant, Soil and Microbial Sciences, Michigan State University, East Lansing, MI 48824, United States
| | - Xin Jiang
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Philippe Schmitt-Kopplin
- Helmholtz Zentrum München, German Research Center for Environmental Health, Research Unit Analytical BioGeoChemistry, Ingolstaedter Landstrasse 1, D-85764 Neuherberg, Germany; Chair of Analytical Food Chemistry, Technische Universität München, D-85354 Freising-Weihenstephan, Germany
| | - Reiner Schroll
- Department of Microbe Plant Interactions, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany
| | - Fang Wang
- Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China; Department of Microbe Plant Interactions, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg 85764, Germany; University of the Chinese Academy of Sciences, Beijing 100049, China.
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Nielsen TK, Carstens AB, Browne P, Lametsch R, Neve H, Kot W, Hansen LH. The first characterized phage against a member of the ecologically important sphingomonads reveals high dissimilarity against all other known phages. Sci Rep 2017; 7:13566. [PMID: 29051555 PMCID: PMC5648845 DOI: 10.1038/s41598-017-13911-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2017] [Accepted: 09/29/2017] [Indexed: 01/26/2023] Open
Abstract
This study describes the first molecular characterization of a bacteriophage infecting a member of the environmentally important Sphingomonadaceae family. Both bacteriophage Lacusarx and its host Sphingobium sp. IP1 were isolated from activated sludge from a wastewater treatment plant. Genome sequencing revealed that the phage genes display little similarity to other known phages, despite a remarkable conservation of the synteny in which the functional genes occur among distantly related phages. Phylogenetic analyses confirmed that Lacusarx represents a hitherto undescribed genus of phages. A classical lysis cassette could not be identified in Lacusarx, suggesting that the genes encoding endolysin, holin, and spanin are host-specific and not found in phages infecting other bacteria. The virus harbors 24 tRNA genes corresponding to 18 different amino acids and furthermore has a significantly different codon usage than its host. Proteomic analysis of Lacusarx revealed the protein components of the phage particle. A lysogeny test indicated that Lacusarx is not a temperate phage.
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Affiliation(s)
- Tue Kjærgaard Nielsen
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399C, 4000, Roskilde, Denmark
| | - Alexander Byth Carstens
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399C, 4000, Roskilde, Denmark
| | - Patrick Browne
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399C, 4000, Roskilde, Denmark
| | - René Lametsch
- Department of Food Science, Faculty of Science, University of Copenhagen, Rolighedsvej 26, 1958, Frederiksberg C, Denmark
| | - Horst Neve
- Department of Microbiology and Biotechnology, Max Rubner-Institut, Hermann-Weigmann-Straße 1, 24103, Kiel, Germany
| | - Witold Kot
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399C, 4000, Roskilde, Denmark
| | - Lars Hestbjerg Hansen
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399C, 4000, Roskilde, Denmark.
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Rojjanateeranaj P, Sangthong C, Prapagdee B. Enhanced cadmium phytoremediation of Glycine max L. through bioaugmentation of cadmium-resistant bacteria assisted by biostimulation. CHEMOSPHERE 2017; 185:764-771. [PMID: 28734213 DOI: 10.1016/j.chemosphere.2017.07.074] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 06/12/2017] [Accepted: 07/15/2017] [Indexed: 06/07/2023]
Abstract
This study examined the potential of three strains of cadmium-resistant bacteria, including Micrococcus sp., Pseudomonas sp. and Arthrobacter sp., to promote root elongation of Glycine max L. seedlings, soil cadmium solubility and cadmium phytoremediation in G. max L. planted in soil highly polluted with cadmium with and without nutrient biostimulation. Micrococcus sp. promoted root length in G. max L. seedlings under toxic cadmium conditions. Soil inoculation with Arthrobacter sp. increased the bioavailable fraction of soil cadmium, particularly in soil amended with a C:N ratio of 20:1. Pot culture experiments observed that the highest plant growth was in Micrococcus sp.-inoculated plants with nutrient biostimulation. Cadmium accumulation in the roots, stems and leaves of G. max L. was significantly enhanced by Arthrobacter sp. with nutrient biostimulation. A combined use of G. max L. and Arthrobacter sp. with nutrient biostimulation accelerated cadmium phytoremediation. In addition, cadmium was retained in roots more than in stems and leaves and G. max L. had the lowest translocation factor at all growth stages, suggesting that G. max L. is a phytostabilizing plant. We concluded that biostimulation-assisted bioaugmentation is an important strategy for improving cadmium phytoremediation efficiency.
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Affiliation(s)
- Pongsarun Rojjanateeranaj
- Laboratory of Environmental Biotechnology, Faculty of Environment and Resource Studies, Mahidol University, Salaya, Nakhonpathom 73170, Thailand
| | - Chirawee Sangthong
- Laboratory of Environmental Biotechnology, Faculty of Environment and Resource Studies, Mahidol University, Salaya, Nakhonpathom 73170, Thailand
| | - Benjaphorn Prapagdee
- Laboratory of Environmental Biotechnology, Faculty of Environment and Resource Studies, Mahidol University, Salaya, Nakhonpathom 73170, Thailand.
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Giovanella P, Cabral L, Costa AP, de Oliveira Camargo FA, Gianello C, Bento FM. Metal resistance mechanisms in Gram-negative bacteria and their potential to remove Hg in the presence of other metals. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2017; 140:162-169. [PMID: 28259060 DOI: 10.1016/j.ecoenv.2017.02.010] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Revised: 02/06/2017] [Accepted: 02/08/2017] [Indexed: 06/06/2023]
Abstract
Contamination of the environment by heavy metals has been increasing in recent years due to industrial activities. Thus research involving microorganisms capable of surviving in multi-contaminated environments is extremely important. The objectives of the present study were to evaluate the removal of mercury alone and in the presence of cadmium, nickel and lead by four mercury-resistant microorganisms; estimate the removal of Cd, Ni and Pb; understand the mechanisms involved (reduction, siderophores, biofilms, biosorption and bioaccumulation) in the metal resistance of the isolate Pseudomonas sp. B50D; and determine the capacity of Pseudomonas sp. B50D in removing Hg, Cd, Ni and Pb from an industrial effluent. It was shown that the four isolates evaluated were capable of removing from 62% to 95% of mercury from a culture medium with no addition of other metals. The isolate Pseudomonas sp. B50D showed the best performance in the removal of mercury when evaluated concomitantly with other metals. This isolate was capable of removing 75% of Hg in the presence of Cd and 91% in the presence of Ni and Pb. With respect to the other metals it removed 60%, 15% and 85% of Cd, Ni and Pb, respectively. In tests with effluent, the isolate Pseudomonas sp. B50D removed 85% of Hg but did not remove the other metals. This isolate presented reduction, biosorption, biofilm production and siderophore production as its metal resistance mechanisms. Pseudomonas sp. B50D was thus a candidate with potential for application in the bioremediation of effluents with complex metal contaminations.
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Affiliation(s)
- Patricia Giovanella
- Fuels and Biofuels Biodeterioration Laboratory (LAB-BIO), Departament of Microbiology, Immunology and Parasitology - Institute of Health Science, Federal University of Rio Grande do Sul, 500 Sarmento Leite St, 90050-170 Porto Alegre, RS, Brazil.
| | - Lucélia Cabral
- Research Center for Chemistry, Biology and Agriculture (CPQBA), University of Campinas (UNICAMP), 999 Alexandre Cazelatto St, Caixa Postal: 6171 Betel, 13081-970 Paulínia, SP, Brazil
| | - Alexandre Pereira Costa
- Fuels and Biofuels Biodeterioration Laboratory (LAB-BIO), Departament of Microbiology, Immunology and Parasitology - Institute of Health Science, Federal University of Rio Grande do Sul, 500 Sarmento Leite St, 90050-170 Porto Alegre, RS, Brazil
| | | | - Clesio Gianello
- Departament of Soil Science, Federal University of Rio Grande do Sul, 7712 Bento Gonçalves Ave, 91540-000 Porto Alegre RS, Brazil
| | - Fátima Menezes Bento
- Fuels and Biofuels Biodeterioration Laboratory (LAB-BIO), Departament of Microbiology, Immunology and Parasitology - Institute of Health Science, Federal University of Rio Grande do Sul, 500 Sarmento Leite St, 90050-170 Porto Alegre, RS, Brazil
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28
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Mahbub KR, Bahar MM, Labbate M, Krishnan K, Andrews S, Naidu R, Megharaj M. Bioremediation of mercury: not properly exploited in contaminated soils! Appl Microbiol Biotechnol 2017; 101:963-976. [DOI: 10.1007/s00253-016-8079-2] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 12/14/2016] [Indexed: 12/18/2022]
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