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Mathur M, Rawat N, Saxena T, Khandelwal R, Jain N, Sharma MK, Mohan MK, Bhatnagar P, Flora SJS, Kaushik P. Effect of Arsenic on Fluoride Tolerance in Microbacterium paraoxydans Strain IR-1. TOXICS 2023; 11:945. [PMID: 37999597 PMCID: PMC10675054 DOI: 10.3390/toxics11110945] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 10/30/2023] [Accepted: 11/09/2023] [Indexed: 11/25/2023]
Abstract
Fluoride (F) and arsenic (As) are two major contaminants of water and soil systems around the globe, causing potential toxicity to humans, plants, animals, and microbes. These contaminated soil systems can be restored by microorganisms that can tolerate toxic stress and provide rapid mineralization of soil, organic matter, and contaminants, using various tolerance mechanisms. Thus, the present study was undertaken with the arsenic hyper-tolerant bacterium Microbacterium paraoxydans strain IR-1 to determine its tolerance and toxicity to increasing doses of fluoride, either individually or in combination with arsenic, in terms of growth inhibition using a toxicity unit model. The minimum inhibitory concentration (MIC)and half maximal inhibitory concentration (IC50) values for fluoride increased, from 9 g/L to 11 g/L and from 5.91 ± 0.1 g/L to 6.32 ± 0.028 g/L, respectively, in the combination (F + As) group. The statistical comparison of observed and expected additive toxicities, with respect to toxicity unit (TU difference), using Student's t-test, was found to be highly significant (p < 0.001). This suggests the antagonistic effect of arsenic on fluoride toxicity to the strain IR-1. The unique stress tolerance of IR-1 ensures its survival as well as preponderance in fluoride and arsenic co-contaminated sites, thus paving the way for its possible application in the natural or artificial remediation of toxicant-exposed degraded soil systems.
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Affiliation(s)
- Megha Mathur
- Applied Microbiology Laboratory, Centre for Rural Development and Technology, Indian Institute of Technology, Delhi 110016, India;
| | - Neha Rawat
- Department of Life Sciences, IIS University, Mansarovar, Jaipur 302020, India (P.B.)
| | - Tanushree Saxena
- Department of Life Sciences, IIS University, Mansarovar, Jaipur 302020, India (P.B.)
| | - Renu Khandelwal
- Centre for Advanced Studies, Department of Zoology, University of Rajasthan, Jaipur 302004, India
| | - Neha Jain
- Centre for Advanced Studies, Department of Zoology, University of Rajasthan, Jaipur 302004, India
| | - Mukesh K. Sharma
- Department of Zoology, S.P.C., Government College, Ajmer 305001, India
| | - Medicherla K. Mohan
- Department of Biotechnology and Bioinformatics, Birla Institute of Scientific Research, C Scheme, Jaipur 302001, India;
| | - Pradeep Bhatnagar
- Department of Life Sciences, IIS University, Mansarovar, Jaipur 302020, India (P.B.)
| | - Swaran J. S. Flora
- National Institute of Pharmaceutical Education and Research-Raebareli, Lucknow 226002, India
| | - Pallavi Kaushik
- Centre for Advanced Studies, Department of Zoology, University of Rajasthan, Jaipur 302004, India
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Yang R, Sun W, Guo L, Li B, Wang Q, Huang D, Gao W, Xu R, Li Y. Response of soil protists to antimony and arsenic contamination. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2022; 315:120387. [PMID: 36223853 DOI: 10.1016/j.envpol.2022.120387] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Revised: 09/07/2022] [Accepted: 10/05/2022] [Indexed: 06/16/2023]
Abstract
Microorganisms can mediate antimony (Sb) and arsenic (As) transformation and thus change their mobility and toxicity. Having similar geochemical behavior, Sb and As are generally considered to exert similar environmental pressure on microbiome. However, it needs further validation, especially for protists. In this study, the responses of protistan communities to Sb and As were investigated by collecting soils from Xikuangshan Sb mine and Shimen As mine in China. Antimony and As contamination taxonomically and functionally (consumer and phototroph) changed the alpha and beta diversities of protistan communities, but exerted different impacts on the parasitic community. Based on multiple statistical tools, As contamination had a greater impact on protistan communities than Sb. The ecological networks of highly contaminated sites were less complex but highly positively connected compared to less contaminated sites. High As contamination raised the ratio of consumers and decreased the ratio of phototrophs in ecological networks, while the opposite tendency was observed in Sb contaminated soils. High Sb and As contamination enriched different keystone taxa resistant to Sb and As. These results demonstrate that protistan community respond differently to Sb and As.
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Affiliation(s)
- Rui Yang
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangdong Academy of Sciences, Guangzhou, 510650, PR China
| | - Weimin Sun
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangdong Academy of Sciences, Guangzhou, 510650, PR China
| | - Lifang Guo
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangdong Academy of Sciences, Guangzhou, 510650, PR China
| | - Baoqin Li
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangdong Academy of Sciences, Guangzhou, 510650, PR China
| | - Qi Wang
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangdong Academy of Sciences, Guangzhou, 510650, PR China
| | - Duanyi Huang
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangdong Academy of Sciences, Guangzhou, 510650, PR China
| | - Wenlong Gao
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangdong Academy of Sciences, Guangzhou, 510650, PR China; Hainan Key Laboratory of Tropical Eco-Circular Agriculture, Environment and Plant Protection Institute, Chinese Academy of Tropical Agricultural Sciences, Haikou, 571101, PR China; Hainan Danzhou Tropical Agro-ecosystem National Observation and Research Station, Danzhou, 571737, PR China
| | - Rui Xu
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangdong Academy of Sciences, Guangzhou, 510650, PR China; Institute of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, PR China
| | - Yongbin Li
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangdong Academy of Sciences, Guangzhou, 510650, PR China.
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Singh A, Kumar M, Chakdar H, Pandiyan K, Kumar SC, Zeyad MT, Singh BN, Ravikiran KT, Mahto A, Srivastava AK, Saxena AK. Influence of host genotype in establishing root associated microbiome of indica rice cultivars for plant growth promotion. Front Microbiol 2022; 13:1033158. [PMID: 36452918 PMCID: PMC9702084 DOI: 10.3389/fmicb.2022.1033158] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Accepted: 10/20/2022] [Indexed: 08/29/2023] Open
Abstract
Rice plants display a unique root ecosystem comprising oxic-anoxic zones, harboring a plethora of metabolic interactions mediated by its root microbiome. Since agricultural land is limited, an increase in rice production will rely on novel methods of yield enhancement. The nascent concept of tailoring plant phenotype through the intervention of synthetic microbial communities (SynComs) is inspired by the genetics and ecology of core rhizobiome. In this direction, we have studied structural and functional variations in the root microbiome of 10 indica rice varieties. The studies on α and β-diversity indices of rhizospheric root microbiome with the host genotypes revealed variations in the structuring of root microbiome as well as a strong association with the host genotypes. Biomarker discovery, using machine learning, highlighted members of class Anaerolineae, α-Proteobacteria, and bacterial genera like Desulfobacteria, Ca. Entotheonella, Algoriphagus, etc. as the most important features of indica rice microbiota having a role in improving the plant's fitness. Metabolically, rice rhizobiomes showed an abundance of genes related to sulfur oxidation and reduction, biofilm production, nitrogen fixation, denitrification, and phosphorus metabolism. This comparative study of rhizobiomes has outlined the taxonomic composition and functional diversification of rice rhizobiome, laying the foundation for the development of next-generation microbiome-based technologies for yield enhancement in rice and other crops.
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Affiliation(s)
- Arjun Singh
- ICAR-National Bureau of Agriculturally Important Microorganisms, Mau, India
- ICAR-Central Soil Salinity Research Institute, RRS, Lucknow, India
| | - Murugan Kumar
- ICAR-National Bureau of Agriculturally Important Microorganisms, Mau, India
| | - Hillol Chakdar
- ICAR-National Bureau of Agriculturally Important Microorganisms, Mau, India
| | - Kuppusamy Pandiyan
- ICAR-National Bureau of Agriculturally Important Microorganisms, Mau, India
- Ginning Training Center, ICAR-Central Institute for Research on Cotton Technology, Nagpur, India
| | - Shiv Charan Kumar
- ICAR-National Bureau of Agriculturally Important Microorganisms, Mau, India
| | | | | | - K. T. Ravikiran
- ICAR-Central Soil Salinity Research Institute, RRS, Lucknow, India
| | - Arunima Mahto
- National Institute of Plant Genome Research, New Delhi, India
| | | | - Anil Kumar Saxena
- ICAR-National Bureau of Agriculturally Important Microorganisms, Mau, India
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Rajendran M, Barathi S, Sajjad M, Albasher G, Lee J. Adsorption of As(III) and As(V) by Fe/C composite nanoparticles synthesized via a one-pot hydrothermal approach without the addition of carbon sources. ENVIRONMENTAL RESEARCH 2022; 214:113899. [PMID: 35870503 DOI: 10.1016/j.envres.2022.113899] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 07/04/2022] [Accepted: 07/10/2022] [Indexed: 06/15/2023]
Abstract
Arsenic remediation from contaminated water has become a serious issue worldwide. Carbon-encapsulated Fe nanoparticle composites (Fe/C CNPs) were created utilizing a one-pot hydrothermal process with ferrocene and no carbon sources. The Fe/C CNPs produced were characterized using a variety of techniques. As(III) and As(IV) (V) were modeled using a pseudo-second-order kinetic model. The Langmuir model described As(III) adsorption on Fe/C CNPs with an extreme adsorption ability of 5.85 mg g-1, indicating monolayer adsorption. On the other hand, (V) adsorption was well matched with the Freundlich model, with a high adsorption volume of 5.05 mg g-1, demonstrating multilayer adsorption onto the surface of Fe/C CNPs. These findings imply that the Fe/C CNPs generated can be utilized to remediate As-contaminated water.
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Affiliation(s)
- Manikandan Rajendran
- Department of Biotechnology, Padmavani Arts and Science College for Women, Salem, Tamil Nadu, India
| | - Selvaraj Barathi
- School of Chemical Engineering, Yeungnam University, Gyeongsan, South Korea.
| | | | - Gadah Albasher
- Department of Zoology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Jintae Lee
- School of Chemical Engineering, Yeungnam University, Gyeongsan, South Korea.
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McGrory E, Henry T, Conroy P, Morrison L. Occurrence, Geochemistry and Speciation of Elevated Arsenic Concentrations in a Fractured Bedrock Aquifer System. ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2021; 81:414-437. [PMID: 34519866 PMCID: PMC8478764 DOI: 10.1007/s00244-021-00887-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 08/30/2021] [Indexed: 06/13/2023]
Abstract
The presence of elevated arsenic concentrations (≥ 10 µg L-1) in groundwaters has been widely reported in areas of South-East Asia with recent studies showing its detection in fractured bedrock aquifers is occurring mainly in regions of north-eastern USA. However, data within Europe remain limited; therefore, the objective of this work was to understand the geochemical mobilisation mechanism of arsenic in this geologic setting using a study site in Ireland as a case study. Physicochemical (pH, Eh, d-O2), trace metals, major ion and arsenic speciation samples were collected and analysed using a variety of field and laboratory-based techniques and evaluated using statistical analysis. Groundwaters containing elevated dissolved arsenic concentrations (up to 73.95 µg L-1) were characterised as oxic-alkali groundwaters with the co-occurrence of other oxyanions (including Mo, Se, Sb and U), low dissolved concentrations of Fe and Mn, and low Na/Ca ratios indicated that arsenic was mobilised through alkali desorption of Fe oxyhydroxides. Arsenic speciation using a solid-phase extraction methodology (n = 20) showed that the dominant species of arsenic was arsenate, with pH being a major controlling factor. The expected source of arsenic is sulphide minerals within fractures of the bedrock aquifer with transportation of arsenic and other oxyanion forming elements facilitated by secondary Fe mineral phases. However, the presence of methylarsenical compounds detected in groundwaters illustrates that microbially mediated mobilisation processes may also be (co)-occurring. This study gives insight into the geochemistry of arsenic mobilisation that can be used to further guide research needs in this area for the protection of groundwater resources.
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Affiliation(s)
- Ellen McGrory
- Earth and Ocean Sciences, School of Natural Sciences and Ryan Institute, Environmental, Marine and Energy Research, National University of Ireland, University Road, Galway, H91 TK33, Ireland
| | - Tiernan Henry
- Earth and Ocean Sciences, School of Natural Sciences and Ryan Institute, Environmental, Marine and Energy Research, National University of Ireland, University Road, Galway, H91 TK33, Ireland
| | - Peter Conroy
- Earth and Ocean Sciences, School of Natural Sciences and Ryan Institute, Environmental, Marine and Energy Research, National University of Ireland, University Road, Galway, H91 TK33, Ireland
| | - Liam Morrison
- Earth and Ocean Sciences, School of Natural Sciences and Ryan Institute, Environmental, Marine and Energy Research, National University of Ireland, University Road, Galway, H91 TK33, Ireland.
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