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Yu Q, Chen J, Ye M, Wei Y, Zhang C, Ge Y. N-acyl homoserine lactones (AHLs) enhanced removal of cadmium and other pollutants by algae-bacteria consortia. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 366:121792. [PMID: 39002459 DOI: 10.1016/j.jenvman.2024.121792] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 06/23/2024] [Accepted: 07/07/2024] [Indexed: 07/15/2024]
Abstract
Signal transduction is an important mode of algae-bacteria interaction, in which bacterial quorum sensing (QS) may affect microalgal growth and metabolism. Currently, little is known whether acyl homoserine lactones (AHLs) released by bacteria can affect the pollutant removal by algae-bacteria consortia (ABC). In this study, we constructed ABC using Chlorella vulgaris (Cv) with two AHLs-producing bacteria and investigated their performance in the removal of multiple pollutants, including chemical oxygen demand (COD), total nitrogen (TN), phosphorus (P), and cadmium (Cd). The AHLs-producing bacteria, namely Agrobacterium sp. (Ap) and Ensifer adherens (Ea), were capable of forming a symbiosis with C. vulgaris. Consortia of Cv and Ap with ratio of 2:1 (Cv2-Ap1) showed the optimal growth promotion and higher removal of Cd, COD, TN, and P compared to the C. vulgaris monoculture. Cv2-Ap1 ABC removed 36.1-47.5% of Cd, 94.5%-94.6% COD, 37.1%-56.0% TN, and 90.4%-93.5% P from the culture medium. In addition, increase of intracellular neutral lipids and extracellular protein, as well as the types of functional groups on cell surface contributed to Cd removal and tolerance in the Cv2-Ap1 ABC. Six AHLs were detected in the Cv2-Ap1 culture. Among these, 3OC8-HSL and 3OC12-HSL additions promoted the ABC growth and enhanced their Cd accumulation. These findings may contribute to further understanding of AHL-mediated communication between algae and bacteria and provide support bioremediation efforts of metal-containing wastewater.
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Affiliation(s)
- Qingnan Yu
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Jiale Chen
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Menglei Ye
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Yanping Wei
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Chunhua Zhang
- Laboratory Centre of Life Science, College of Life Science, Nanjing Agricultural University, Nanjing, 210095, China
| | - Ying Ge
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China.
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Zhao J, Ma J, Yang Y, Yu H, Zhang S, Chen F. Response of Soil Microbial Community to Vegetation Reconstruction Modes in Mining Areas of the Loess Plateau, China. Front Microbiol 2021; 12:714967. [PMID: 34512593 PMCID: PMC8424123 DOI: 10.3389/fmicb.2021.714967] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Accepted: 07/30/2021] [Indexed: 11/25/2022] Open
Abstract
Vegetation reconstruction and restoration is vital to the health of the mine land ecosystem. Different vegetations might change microbial community structure and function of soil, mediating the biogeochemical cycle and nutrition supply to the soil. To clarify the response of soil microbes to different vegetation reconstruction modes in the mining areas of the Loess Plateau, China, soil microbial community structures and functions were determined by the MiSeq high-throughput sequencing along with PICRUSt2 and FUNGuild tools. The fungal community richness was observed to be the highest in grassland soil and positively correlated with soil organic matter, total nitrogen, and nitrate-nitrogen. The bacterial and fungal community structures were similar in grassland and brushland areas, but were significantly differentiated in the coniferous and broadleaf forest, and the leading factors were soil pH and nitrate-nitrogen. Actinobacteriota, Proteobacteria, and Acidobacteriota were the dominant bacterial phyla under different vegetation reconstruction modes. The dominant phyla of fungi were Ascomycota, Basidiomycota, and Mortierellomycota. Different vegetation reconstruction modes did not affect the bacterial functional communities but shaped different functional groups of fungi. The grassland soil was dominated by saprotrophic fungi, while symbiotrophic fungi dominated the coniferous and broadleaf forests. The results suggested that shifts in vegetation reconstruction modes may alter the mining soil bacterial and fungal community structures and function. These findings improve the understanding of microbial ecology in the reclaimed mine soil and provide a reference for the ecological restoration of fragile mining ecosystems.
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Affiliation(s)
- Jiao Zhao
- Engineering Research Center of Ministry of Education for Mine Ecological Restoration, Xuzhou, China.,Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou, China
| | - Jing Ma
- Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou, China
| | - Yongjun Yang
- Engineering Research Center of Ministry of Education for Mine Ecological Restoration, Xuzhou, China
| | - Haochen Yu
- Engineering Research Center of Ministry of Education for Mine Ecological Restoration, Xuzhou, China
| | - Shaoliang Zhang
- Engineering Research Center of Ministry of Education for Mine Ecological Restoration, Xuzhou, China
| | - Fu Chen
- Engineering Research Center of Ministry of Education for Mine Ecological Restoration, Xuzhou, China.,Low Carbon Energy Institute, China University of Mining and Technology, Xuzhou, China
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Balázs HE, Schmid CAO, Cruzeiro C, Podar D, Szatmari PM, Buegger F, Hufnagel G, Radl V, Schröder P. Post-reclamation microbial diversity and functions in hexachlorocyclohexane (HCH) contaminated soil in relation to spontaneous HCH tolerant vegetation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 767:144653. [PMID: 33550064 DOI: 10.1016/j.scitotenv.2020.144653] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2020] [Revised: 11/24/2020] [Accepted: 12/16/2020] [Indexed: 06/12/2023]
Abstract
The toxicity, volatility and persistence of the obsolete organochlorine pesticide hexachlorocyclohexane (HCH), makes reclamation of contaminated areas a priority for the health and welfare of neighboring human communities. Microbial diversity and functions and their relation to spontaneous vegetation in post-excavation situations, are essential indicators to consider in bioaugmentation or microbe-assisted phytoremediation strategies at field scale. Our study aimed to evaluate the effects of long-term HCH contamination on soil and plant-associated microbial communities, and whether contaminated soil has the potential to act as a bacterial inoculum in post-excavation bioremediation strategies. To scrutinize the role of vegetation, the potential nitrogen fixation of free-living and symbiotic diazotrophs of the legume Lotus tenuis was assessed as a measure of nutrient cycling functions in soil under HCH contamination. Potential nitrogen fixation was generally not affected by HCH, with the exception of lower nifH gene counts in excavated contaminated rhizospheres, most probably a short-term HCH effect on early bacterial succession in this compartment. HCH shaped microbial communities in long-term contaminated bulk soil, where we identified possible HCH tolerants such as Sphingomonas and Altererythrobacter. In L. tenuis rhizosphere, microbial community composition was additionally influenced by plant growth stage. Sphingobium and Massilia were the bacterial genera characteristic for HCH contaminated rhizospheres. Long-term HCH contamination negatively affected L. tenuis growth and development. However, root-associated bacterial community composition was driven solely by plant age, with negligible HCH effect. Results showed that L. tenuis acquired possible HCH tolerant bacteria such as the Allorhizobium-Neorhizobium-Pararhizobium-Rhizobium clade, Sphingomonas, Massilia or Pantoea which could simultaneously offer plant growth promoting (PGP) benefits for the host. Finally, we identified an inoculum with possibly HCH tolerant, PGP bacteria transferred from the contaminated bulk soil to L. tenuis roots through the rhizosphere compartment, consisting of Mesorhizobium loti, Neorhizobium galegae, Novosphingobium lindaniclasticum, Pantoea agglomerans and Lysobacter bugurensis.
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Affiliation(s)
- Helga E Balázs
- Helmholtz Zentrum München GmbH, Research Unit for Comparative Microbiome Analysis, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany; Babeş-Bolyai University, Department of Taxonomy and Ecology, 1 Kogălniceanu St., 400084 Cluj-Napoca, Romania
| | - Christoph A O Schmid
- Helmholtz Zentrum München GmbH, Research Unit for Comparative Microbiome Analysis, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany
| | - Catarina Cruzeiro
- Helmholtz Zentrum München GmbH, Research Unit for Comparative Microbiome Analysis, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany.
| | - Dorina Podar
- Babeş-Bolyai University, Department of Molecular Biology and Biotechnology, 1 Kogălniceanu St., 400084 Cluj-Napoca, Romania.
| | - Paul-Marian Szatmari
- Babeş-Bolyai University, Department of Taxonomy and Ecology, 1 Kogălniceanu St., 400084 Cluj-Napoca, Romania; Biological Research Center, Botanical Garden "Vasile Fati", 16 Wesselényi Miklós St., 455200 Jibou, Romania
| | - Franz Buegger
- Helmholtz Zentrum München GmbH, Research Unit for Biochemical Plant Pathology, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany.
| | - Gudrun Hufnagel
- Helmholtz Zentrum München GmbH, Research Unit for Comparative Microbiome Analysis, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany.
| | - Viviane Radl
- Helmholtz Zentrum München GmbH, Research Unit for Comparative Microbiome Analysis, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany.
| | - Peter Schröder
- Helmholtz Zentrum München GmbH, Research Unit for Comparative Microbiome Analysis, Ingolstädter Landstraße 1, 85764 Neuherberg, Germany.
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Abou-Shanab RAI, Mathai PP, Santelli C, Sadowsky MJ. Indigenous soil bacteria and the hyperaccumulator Pteris vittata mediate phytoremediation of soil contaminated with arsenic species. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 195:110458. [PMID: 32193021 DOI: 10.1016/j.ecoenv.2020.110458] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 02/20/2020] [Accepted: 03/07/2020] [Indexed: 06/10/2023]
Abstract
Arsenic (As) is a pollutant of major concern worldwide, posing as a threat to both human health and the environment. Phytoremediation has been proposed as a viable mechanism to remediate As-contaminated soil environments. Pot experiments were performed to evaluate the phytoextraction efficiency of As by Pteris vittata, a known As hyperaccumulating fern, from soil amended with different concentrations of arsenate [As(V)] and arsenite [As(III)], the more common, inorganic As forms in soil. The greatest accumulation of As (13.3 ± 0.36 g/kg Dwt) was found in fronds of plants grown in soil spiked with 1.0 g As(V)/kg. The maximum As-bioaccumulation factor (27.3 ± 1.9) was achieved by plants grown in soil amended with 0.05 g As(V)/kg. A total of 864 bacterial cultures were isolated and examined for their ability to enhance phytoremediation of As-contaminated soils. Traits examined included tolerance to As (III and V), production of siderophores, and/or ability to solubilize calcium phosphate and indole acetic acid (IAA) production. A culture-based survey shows greater numbers of viable and As-resistant bacteria were found in the rhizosphere of As-grown plants compared to bulk and unplanted soils. The percentage of bacteria resistant to As(V) was greater (P < 0.0001) than those resistant to As(III) in culture medium containing 0.5, 1, 1.5, and 2 g As/L. Higher (P < 0.0001) percentages of siderophore producing (77%) and phosphate solubilizing (61%) bacteria were observed among cultures isolated from unplanted soil. About 5% (44 of 864) of the isolates were highly resistant to both As (III) and As (V) (2 g/L), and were examined for their As-transformation ability and IAA production. A great proportion of the isolates produced IAA (82%) and promoted As (V)-reduction (95%) or As(III)-oxidation (73%), and 71% exhibited dual capacity for both As(V) reduction and As(III) oxidation. Phylogenetic analysis indicated that 67, 23, and 10% of these isolates belonged to Proteobacteria, Actinobacteria, and Firmicutes, respectively. Analysis of the 16S rRNA gene sequences confirmed that these isolates were closely related to 12 genera and 25 species of bacteria and were dominated by members of the genus Pseudomonas (39%). These results show that these isolates could potentially be developed as inocula for enhancing plant uptake during large scale phytoremediation of As-impacted soils.
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Affiliation(s)
| | - Prince P Mathai
- BioTechnology Institute, University of Minnesota, St. Paul, MN, USA
| | - Cara Santelli
- BioTechnology Institute, University of Minnesota, St. Paul, MN, USA; Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, MN, USA
| | - Michael J Sadowsky
- BioTechnology Institute, University of Minnesota, St. Paul, MN, USA; Department of Soil, Water & Climate and Department of Plant & Microbial Biology, University of Minnesota, St. Paul, MN, USA.
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Lopez S, van der Ent A, Sumail S, Sugau JB, Buang MM, Amin Z, Echevarria G, Morel JL, Benizri E. Bacterial community diversity in the rhizosphere of nickel hyperaccumulator plant species from Borneo Island (Malaysia). Environ Microbiol 2020; 22:1649-1665. [PMID: 32128926 DOI: 10.1111/1462-2920.14970] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Revised: 02/27/2020] [Accepted: 03/01/2020] [Indexed: 12/01/2022]
Abstract
The Island of Borneo is a major biodiversity hotspot, and in the Malaysian state of Sabah, ultramafic soils are extensive and home to more than 31 endemic nickel hyperaccumulator plants. The aim of this study was to characterize the structure and the diversity of the rhizosphere bacterial communities of several of these nickel hyperaccumulator plants and factors that affect these bacterial communities in Sabah. The most abundant phyla were Proteobacteria, Acidobacteria and Actinobacteria. At family level, Burkholderiaceae and Xanthobacteraceae (Proteobacteria phylum) were the most abundant families in the hyperaccumulator rhizospheres. Redundancy analysis based on soil chemical analyses and relative abundances of the major bacterial phyla showed that abiotic factors of the studied sites drove the bacterial diversity. For all R. aff. bengalensis rhizosphere soil samples, irrespective of studied site, the bacterial diversity was similar. Moreover, the Saprospiraceae family showed a high representativeness in the R. aff. bengalensis rhizosphere soils and was linked with the nickel availability in soils. The ability of R. aff. bengalensis to concentrate nickel in its rhizosphere appears to be the major factor driving the rhizobacterial community diversity unlike for other hyperaccumulator species.
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Affiliation(s)
- Séverine Lopez
- Université de Lorraine, INRAE, Laboratoire Sols et Environnement, 54000, Nancy, France
| | - Antony van der Ent
- Université de Lorraine, INRAE, Laboratoire Sols et Environnement, 54000, Nancy, France.,Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, St Lucia, 4072, QLD, Australia
| | | | | | - Matsain Mohd Buang
- Forest Research Centre, Sabah Forestry Department, Sandakan, Sabah, Malaysia
| | - Zarina Amin
- Biotechnology Research Institute, Universiti Malaysia Sabah, Kota Kinabalu, Sabah, Malaysia
| | - Guillaume Echevarria
- Université de Lorraine, INRAE, Laboratoire Sols et Environnement, 54000, Nancy, France.,Centre for Mined Land Rehabilitation, Sustainable Minerals Institute, The University of Queensland, St Lucia, 4072, QLD, Australia
| | - Jean Louis Morel
- Université de Lorraine, INRAE, Laboratoire Sols et Environnement, 54000, Nancy, France
| | - Emile Benizri
- Université de Lorraine, INRAE, Laboratoire Sols et Environnement, 54000, Nancy, France
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6
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Costa FS, Macedo MWFS, Araújo ACM, Rodrigues CA, Kuramae EE, de Barros Alcanfor SK, Pessoa-Filho M, Barreto CC. Assessing nickel tolerance of bacteria isolated from serpentine soils. Braz J Microbiol 2019; 50:705-713. [PMID: 31297747 DOI: 10.1007/s42770-019-00111-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 06/11/2019] [Indexed: 10/26/2022] Open
Abstract
Serpentine soils present unique characteristics such as a low Ca/Mg ratio, low concentration of nutrients, and a high concentration of heavy metals, especially nickel. Soil bacterial isolates from an ultramafic complex located in the tropical savanna known as the Brazilian Cerrado were studied. Nickel-tolerant bacteria were obtained, and their ability to remove nickel from a culture medium was assessed. Bacterial isolates presented higher tolerance to nickel salts than previously reported for bacteria obtained from serpentine environments in other regions of the world. In addition, the quantification of nickel in cell pellets indicated that at least four isolates may adsorb soluble forms of nickel. It is expected that information gathered in this study will support future efforts to exploit serpentine soil bacteria for biotechnological processes involving nickel decontamination from environmental samples.
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Affiliation(s)
- Flávio Silva Costa
- Graduate Program in Genomic Sciences and Biotechnology, Universidade Católica de Brasília, SGAN 916, Avenida W5, Brasilia, 70790-160, Brazil.,Institute of Microbiology, Friedrich-Schiller-Universität Jena, Neugasse 25, 07743, Jena, Germany
| | - Maria Wanna Figueiredo Sena Macedo
- Graduate Program in Genomic Sciences and Biotechnology, Universidade Católica de Brasília, SGAN 916, Avenida W5, Brasilia, 70790-160, Brazil
| | - Ana Carolina Moreira Araújo
- Graduate Program in Genomic Sciences and Biotechnology, Universidade Católica de Brasília, SGAN 916, Avenida W5, Brasilia, 70790-160, Brazil
| | - Cassimira Albuquerque Rodrigues
- Graduate Program in Genomic Sciences and Biotechnology, Universidade Católica de Brasília, SGAN 916, Avenida W5, Brasilia, 70790-160, Brazil
| | - Eiko Eurya Kuramae
- Department of Microbial Ecology, Nederlands Instituut vor Ecologie (NIOO-KNAW), Droevendaalsesteeg 10, 6708 PB, Wageningen, The Netherlands
| | | | - Marco Pessoa-Filho
- Embrapa Cerrados, BR 020, Km 18, PO Box 08223, Brasilia, 73310-970, Brazil
| | - Cristine Chaves Barreto
- Graduate Program in Genomic Sciences and Biotechnology, Universidade Católica de Brasília, SGAN 916, Avenida W5, Brasilia, 70790-160, Brazil.
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Pardo T, Rodríguez-Garrido B, Saad RF, Soto-Vázquez JL, Loureiro-Viñas M, Prieto-Fernández Á, Echevarria G, Benizri E, Kidd PS. Assessing the agromining potential of Mediterranean nickel-hyperaccumulating plant species at field-scale in ultramafic soils under humid-temperate climate. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 630:275-286. [PMID: 29477825 DOI: 10.1016/j.scitotenv.2018.02.229] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Revised: 02/18/2018] [Accepted: 02/19/2018] [Indexed: 06/08/2023]
Abstract
Nickel (Ni) agromining of ultramafic soils has been proposed as an eco-friendly option for metal recovery, which can also improve the fertility and quality of these low productive soils. The selection of adequate plant species and the analysis of their performance under the different climatic conditions are of interest for optimising the process and evaluating its full viability. A one-year field experiment was carried out to evaluate the viability of the two Ni-hyperaccumulating Mediterranean species, Alyssum murale and Leptoplax emarginata, for agromining purposes in ultramafic soils under a humid-temperate climate. Field plots of 50 m2 were established and the soil was fertilised with gypsum and inorganic NPK fertilisers prior to cropping. Alyssum murale produced a slightly higher Ni yield than L. emarginata, but Ni bioaccumulation was dependent on the plant phenological stage for both species, being maximal at mid-flowering (4.2 and 3.0 kg Ni ha-1, respectively). In both species, Ni was mainly stored in the leaves, especially in leaves of vegetative stems, but also in flowers and fruits in the case of L. emarginata. The main contributors to Ni yield of A. murale were flowering stems and their leaves, while for L. emarginata they were flowering stems and fruits. Implementing the agromining system increased soil nutrient availability, and modified microbial community structure and metabolic activity (due to fertilisation and plant root activity). The soil bacterial communities were dominated by Proteobacteria, Actinobacteria, Acidobacteria and Chloroflexi, and the agromining crops modified the relative abundance of some phyla (increasing Proteobacteria, Bacteroidetes and Nitrospirae and reducing Acidobacteria and Planctomycetes). Cultivating A. murale increased the densities of total culturable bacteria, while L. emarginata selected Ni-tolerant bacteria in its rhizosphere. In summary, both species showed great potential for their use in Ni agromining systems, although optimising soil and crop management practices could improve the phytoextraction efficiency.
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Affiliation(s)
- Tania Pardo
- Department of Soil Biochemistry, IIAG-CSIC, Campus Universitario Sur, Av. de Vigo s/n., 15702 Santiago de Compostela, Spain.
| | - Beatriz Rodríguez-Garrido
- Department of Soil Biochemistry, IIAG-CSIC, Campus Universitario Sur, Av. de Vigo s/n., 15702 Santiago de Compostela, Spain
| | - Ramez F Saad
- Université de Lorraine - INRA, Laboratoire «Sols et Environnement», UMR 1120, Vandœuvre-lès-Nancy F-54505, France
| | - Jose Luis Soto-Vázquez
- Department of Soil Biochemistry, IIAG-CSIC, Campus Universitario Sur, Av. de Vigo s/n., 15702 Santiago de Compostela, Spain
| | - Mariana Loureiro-Viñas
- Department of Soil Biochemistry, IIAG-CSIC, Campus Universitario Sur, Av. de Vigo s/n., 15702 Santiago de Compostela, Spain
| | - Ángeles Prieto-Fernández
- Department of Soil Biochemistry, IIAG-CSIC, Campus Universitario Sur, Av. de Vigo s/n., 15702 Santiago de Compostela, Spain
| | - Guillaume Echevarria
- Université de Lorraine - INRA, Laboratoire «Sols et Environnement», UMR 1120, Vandœuvre-lès-Nancy F-54505, France
| | - Emil Benizri
- Université de Lorraine - INRA, Laboratoire «Sols et Environnement», UMR 1120, Vandœuvre-lès-Nancy F-54505, France
| | - Petra S Kidd
- Department of Soil Biochemistry, IIAG-CSIC, Campus Universitario Sur, Av. de Vigo s/n., 15702 Santiago de Compostela, Spain
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Abou-Shanab RAI, Eraky M, Haddad AM, Abdel-Gaffar ARB, Salem AM. Characterization of Crude Oil Degrading Bacteria Isolated from Contaminated Soils Surrounding Gas Stations. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2016; 97:684-688. [PMID: 27655077 DOI: 10.1007/s00128-016-1924-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Accepted: 09/15/2016] [Indexed: 06/06/2023]
Abstract
A total of twenty bacterial cultures were isolated from hydrocarbon contaminated soil. Of the 20 isolates, RAM03, RAM06, RAM13, and RAM17 were specifically chosen based on their relatively higher growth on salt medium amended with 4 % crude oil, emulsion index, surface tension, and degradation percentage. These bacterial cultures had 16S rRNA gene sequences that were most similar to Ochrobactrum cytisi (RAM03), Ochrobactrum anthropi (RAM06 and RAM17), and Sinorhizobium meliloti (RAM13) with 96 %, 100 % and 99 %, and 99 % similarity. The tested strains revealed a promising potential for bioremediation of petroleum oil contamination as they could degrade >93 % and 54 % of total petroleum hydrocarbons (TPHs) in a liquid medium and soil amended with 4 % crude oil, respectively, after 30 day incubation. These bacteria could effectively remove both aliphatic and aromatic petroleum hydrocarbons. In conclusion, these strains could be considered as good prospects for their application in bioremediation of hydrocarbon contaminated environment.
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Affiliation(s)
- Reda A I Abou-Shanab
- Environmental Biotechnology Department, City of Scientific Research and Technology Applications, New Borg El Arab City, Alexandria, 21934, Egypt.
| | - Mohamed Eraky
- Environmental Biotechnology Department, City of Scientific Research and Technology Applications, New Borg El Arab City, Alexandria, 21934, Egypt
| | - Ahmed M Haddad
- Environmental Biotechnology Department, City of Scientific Research and Technology Applications, New Borg El Arab City, Alexandria, 21934, Egypt
| | | | - Ahmed M Salem
- Faculty of Science, Biochemistry Department, Ain Shams University, Cairo, Egypt
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Ofek M, Hadar Y, Minz D. Ecology of root colonizing Massilia (Oxalobacteraceae). PLoS One 2012; 7:e40117. [PMID: 22808103 PMCID: PMC3394795 DOI: 10.1371/journal.pone.0040117] [Citation(s) in RCA: 152] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2012] [Accepted: 06/01/2012] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Ecologically meaningful classification of bacterial populations is essential for understanding the structure and function of bacterial communities. As in soils, the ecological strategy of the majority of root-colonizing bacteria is mostly unknown. Among those are Massilia (Oxalobacteraceae), a major group of rhizosphere and root colonizing bacteria of many plant species. METHODOLOGY/PRINCIPAL FINDINGS The ecology of Massilia was explored in cucumber root and seed, and compared to that of Agrobacterium population, using culture-independent tools, including DNA-based pyrosequencing, fluorescence in situ hybridization and quantitative real-time PCR. Seed- and root-colonizing Massilia were primarily affiliated with other members of the genus described in soil and rhizosphere. Massilia colonized and proliferated on the seed coat, radicle, roots, and also on hyphae of phytopathogenic Pythium aphanidermatum infecting seeds. High variation in Massilia abundance was found in relation to plant developmental stage, along with sensitivity to plant growth medium modification (amendment with organic matter) and potential competitors. Massilia absolute abundance and relative abundance (dominance) were positively related, and peaked (up to 85%) at early stages of succession of the root microbiome. In comparison, variation in abundance of Agrobacterium was moderate and their dominance increased at later stages of succession. CONCLUSIONS In accordance with contemporary models for microbial ecology classification, copiotrophic and competition-sensitive root colonization by Massilia is suggested. These bacteria exploit, in a transient way, a window of opportunity within the succession of communities within this niche.
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Affiliation(s)
- Maya Ofek
- Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Bet Dagan, Israel
- The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
| | - Yitzhak Hadar
- The Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
| | - Dror Minz
- Institute of Soil, Water and Environmental Sciences, Agricultural Research Organization, Bet Dagan, Israel
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10
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Abou-Shanab RAEAI. Bioremediation: New Approaches and Trends. ENVIRONMENTAL POLLUTION 2011:65-94. [DOI: 10.1007/978-94-007-1914-9_3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
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