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Zha S, Wang Z, Tan R, Gong J, Yu A, Liu T, Liu C, Deng C, Zeng G. A novel approach to modify Stenotrophomonas sp. D6 by regulating the salt composition in the growth medium: Enhanced removal performance of Cr(VI). Journal of Hazardous Materials 2024; 461:132540. [PMID: 37714004 DOI: 10.1016/j.jhazmat.2023.132540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 08/14/2023] [Accepted: 09/11/2023] [Indexed: 09/17/2023]
Abstract
In this study, a novel and effective modified microbial reducing agent was developed to detoxify Cr(VI) from aqueous solutions. This was achieved by carefully controlling specific salt components in the growth medium. Based on the single-salt modification, several effective modified salts were selected and added to the medium for synergistic modification. The results showed that the synergistic modification with NH4Cl and KH2PO4 had the best detoxification effect on Cr(VI), reaching 98.5% at 100 mg/L Cr(VI), which was much higher than the 43.7% of the control (original Luria-Bertani medium). This enhancement was ascribed to the ability of NH4Cl and KH2PO4 to stimulate the growth of Stenotrophomonas sp. D6 promoted chromate reductase secretion. The protein content of the modified medium supernatant was significantly increased by 10.76% compared to that before modification. Based on the micro-characterization, the main process for the elimination of Cr(VI) is microbial reduction rather than biosorption. Most of the reduced Cr was found in the extracellular suspension, thereby suggesting that the primary reduction occurred outside the cells, whereas only a small fraction was detected intracellularly. Overall, this study provides a simple and effective method for microbial treatment of heavy metals in aqueous solutions.
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Affiliation(s)
- Shilin Zha
- School of Environment & Chemical Engineering, Nanchang Hangkong University, 330063 Nanchang, Jiangxi, China; National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang 330063, Jiangxi, China
| | - Zhongbing Wang
- School of Environment & Chemical Engineering, Nanchang Hangkong University, 330063 Nanchang, Jiangxi, China; National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang 330063, Jiangxi, China.
| | - Rong Tan
- School of Environment & Chemical Engineering, Nanchang Hangkong University, 330063 Nanchang, Jiangxi, China; National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang 330063, Jiangxi, China
| | - Jie Gong
- School of Environment & Chemical Engineering, Nanchang Hangkong University, 330063 Nanchang, Jiangxi, China; National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang 330063, Jiangxi, China
| | - Ao Yu
- School of Environment & Chemical Engineering, Nanchang Hangkong University, 330063 Nanchang, Jiangxi, China; National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang 330063, Jiangxi, China
| | - Tingting Liu
- School of Environment & Chemical Engineering, Nanchang Hangkong University, 330063 Nanchang, Jiangxi, China; National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang 330063, Jiangxi, China
| | - Chunli Liu
- School of Environment & Chemical Engineering, Nanchang Hangkong University, 330063 Nanchang, Jiangxi, China; National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang 330063, Jiangxi, China
| | - Chunjian Deng
- School of Environment & Chemical Engineering, Nanchang Hangkong University, 330063 Nanchang, Jiangxi, China; National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang 330063, Jiangxi, China
| | - Guisheng Zeng
- School of Environment & Chemical Engineering, Nanchang Hangkong University, 330063 Nanchang, Jiangxi, China; National-Local Joint Engineering Research Center of Heavy Metals Pollutants Control and Resource Utilization, Nanchang 330063, Jiangxi, China.
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2
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Mazaheri H, Nazeri S. Biodegradation and Detoxification of Low-Density Polyethylene (LDPE) by Stenotrophomonas sp. and Alcaligenaceae bacterium. Bull Environ Contam Toxicol 2023; 112:19. [PMID: 38142453 DOI: 10.1007/s00128-023-03836-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2023] [Accepted: 11/09/2023] [Indexed: 12/26/2023]
Abstract
Every year, human activities introduce large amounts of synthetic plastics into the environment. Decomposition of the plastic derivatives is very difficult and time consuming, so it is essential to eliminate these pollutants using different methods. Bioremediation, is suitable option, because of the low cost and environmentally safe. In this research, degradation of low-density polyethylene (LDPE) was investigated by two strains, isolated from Hamadan province (Iran) landfill soil. After identification by 16sr DNA primers, their abilities of polyethylene biodegradation were examined by Fourier transform infrared (FTIR), SEM and Gas Chromatography-Mass Spectrometry (GC-MS). Using media contain polyethylene) after and before addition of bacteria), toxicity test was conducted by measuring the germination index, root and hypocotyl length of Lactuca sativa seed. After three months, 10.15% ± 1.04 weight loss of LDPE achieved through strain Stenotrophomonas sp. degradation. Both strains had high biofilm formation capacity, confirmed by Electron microscope images and FTIR analysis. GC-MS confirmed the presence of the end-product of LDPE degradation (Pentacosane, Hexacosane, and Octadecane). Both, Stenotrophomonas sp. and Alcaligenaceae bacterium had significant detoxification ability. In media contain LDPE (without bacteria), decrease in the germination of lettuce seeds was observed.
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Affiliation(s)
- Hamide Mazaheri
- Biotechnology Department, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Islamic Republic of Iran
| | - Sonbol Nazeri
- Biotechnology Department, Faculty of Agriculture, Bu-Ali Sina University, Hamedan, Islamic Republic of Iran.
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Peng H, Liang M, Zhang J, Liu W, Yang Y, Sun Y, Ke F, Wen Y, Liu S, Xu B, Gao X. Identification and characterization of a versatile keratinase, KerZJ, from Stenotrophomonas sp. LMY. World J Microbiol Biotechnol 2023; 40:30. [PMID: 38057391 DOI: 10.1007/s11274-023-03836-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Accepted: 11/11/2023] [Indexed: 12/08/2023]
Abstract
Keratinases have drawn increasing attention in recent decades owing to their catalytic versatility and broad applications from agriculture to medicine. In the present study, we isolated a highly keratinolytic and fibrinolytic bacterium from the campus soil and named it Stenotrophomonas sp. LMY based on genetic information. To identify the potential keratinase genes, the genome sequence of the strain was obtained and analyzed. Sequence alignment and comparison revealed that the protein 1_737 (KerZJ) had the highest sequence homology to a reported keratinase KerBL. We recombinantly expressed KerZJ in Escherichia coli Origami™ (DE) pLysS and purified it to homogeneity. KerZJ showed the highest activity at 40 °C and pH 9.0, and metal ions exhibited no significant effects on its activity. Although reducing agents would break the disulfide bonds in KerZJ and reduce its activity, KerZJ still exhibited the ability to hydrolyze feather keratin in the presence of β-ME. KerZJ could efficiently digest human prion proteins. In addition, KerZJ showed fibrinolytic activity on fibrin plates and effectively eliminated blood clots in a thrombosis mouse model without side effects. Our results suggest that KerZJ is a versatile keratinase with significant potential for keratin treatment, decontamination of prions, and fibrinolytic therapy.
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Affiliation(s)
- Haixia Peng
- Green Pharmaceutical Technology Key Laboratory of Luzhou, Department of Microbial and Biochemical Pharmacy, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Manyu Liang
- Green Pharmaceutical Technology Key Laboratory of Luzhou, Department of Microbial and Biochemical Pharmacy, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Jing Zhang
- Green Pharmaceutical Technology Key Laboratory of Luzhou, Department of Microbial and Biochemical Pharmacy, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Wenbo Liu
- Green Pharmaceutical Technology Key Laboratory of Luzhou, Department of Microbial and Biochemical Pharmacy, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Yanhong Yang
- Green Pharmaceutical Technology Key Laboratory of Luzhou, Department of Microbial and Biochemical Pharmacy, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Yingjie Sun
- Green Pharmaceutical Technology Key Laboratory of Luzhou, Department of Microbial and Biochemical Pharmacy, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Famin Ke
- Green Pharmaceutical Technology Key Laboratory of Luzhou, Department of Microbial and Biochemical Pharmacy, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Yijiao Wen
- Green Pharmaceutical Technology Key Laboratory of Luzhou, Department of Microbial and Biochemical Pharmacy, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Siyuan Liu
- Green Pharmaceutical Technology Key Laboratory of Luzhou, Department of Microbial and Biochemical Pharmacy, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China
| | - Bilin Xu
- Collaborative Innovation Center for the Characteristic Resources Exploitation of Dabie Mountains, Key Laboratories of Economic Forest Germplasm Improvement and Comprehensive Resources Utilization of Hubei Province, College of Life Science, Huanggang Normal University, Huanggang, 438000, Hubei, China.
| | - Xiaowei Gao
- Green Pharmaceutical Technology Key Laboratory of Luzhou, Department of Microbial and Biochemical Pharmacy, School of Pharmacy, Southwest Medical University, Luzhou, 646000, Sichuan, China.
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Xiao H, Tan J, Li M, Yuan Z, Zhou H. The mechanism of Se(IV) multisystem resistance in Stenotrophomonas sp. EGS12 and its prospect in selenium-contaminated environment remediation. J Hazard Mater 2023; 452:131358. [PMID: 37027916 DOI: 10.1016/j.jhazmat.2023.131358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2022] [Revised: 03/22/2023] [Accepted: 04/02/2023] [Indexed: 05/03/2023]
Abstract
Human activities have led to elevated levels of selenium (Se) in the environment, which poses a threat to ecosystems and human health. Stenotrophomonas sp. EGS12 (EGS12) has been identified as a potential candidate for the bioremediation of repair selenium-contaminated environment because of its ability to efficiently reduce Se(IV) to form selenium nanospheres (SeNPs). To better understand the molecular mechanism of EGS12 in response to Se(IV) stress, a combination of transmission electron microscopy (TEM), genome sequencing techniques, metabolomics and transcriptomics were employed. The results indicated that under 2 mM Se(IV) stress, 132 differential metabolites (DEMs) were identified, and they were significantly enriched in metabolic pathways such as glutathione metabolism and amino acid metabolism. Under the Se(IV) stress of 2 mM, 662 differential genes (DEGs) involved in heavy metal transport, stress response, and toxin synthesis were identified in EGS12. These findings suggest that EGS12 may respond to Se(IV) stress by engaging various mechanisms such as forming biofilms, repairing damaged cell walls/cell membranes, reducing Se(IV) translocation into cells, increasing Se(IV) efflux, multiplying Se(IV) reduction pathways and expelling SeNPs through cell lysis and vesicular transport. The study also discusses the potential of EGS12 to repair Se contamination alone and co-repair with Se-tolerant plants (e.g. Cardamine enshiensis). Our work provides new insights into microbial tolerance to heavy metals and offers valuable information for bio-remediation techniques on Se(IV) contamination.
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Affiliation(s)
- Hongshi Xiao
- College of Bioscience and Biotechnology, Hunan Agricultural University, No.1Nongda Road, Furong, Changsha 410000, China
| | - Jun Tan
- Spice and Beverage Research Institute, Chinese Academy of Tropical Agricultural Sciences, Wanning 571533, China
| | - Mengjia Li
- College of Bioscience and Biotechnology, Hunan Agricultural University, No.1Nongda Road, Furong, Changsha 410000, China
| | - Zhihui Yuan
- College of Chemistry and Bioengineering, Hunan University of Science and Engineering, 130 Yangzitang Road, Lingling, Yongzhou 425199, China.
| | - Haiyan Zhou
- College of Bioscience and Biotechnology, Hunan Agricultural University, No.1Nongda Road, Furong, Changsha 410000, China.
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5
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Hu Z, Zhou Z, Zhou Y, Zheng L, Guo J, Liu Y, Sun Z, Yang Z, Yu X. Synergy of surface adsorption and intracellular accumulation for removal of uranium with Stenotrophomonas sp: Performance and mechanisms. Environ Res 2023; 220:115093. [PMID: 36574801 DOI: 10.1016/j.envres.2022.115093] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2022] [Revised: 12/10/2022] [Accepted: 12/15/2022] [Indexed: 06/17/2023]
Abstract
Uranium is well-known to have serious adverse effects on the ecological environment and human health. Bioremediation stands out among many remediation methods owing to its being economically feasible and environmentally friendly. This study reported a great promising strategy for eliminating uranium by Stenotrophomonas sp. CICC 23833 in the aquatic environment. The bacterium demonstrated excellent uranium adsorption capacity (qmax = 392.9 mg/g) because of the synergistic effect of surface adsorption and intracellular accumulation. Further analysis revealed that hydroxyl, carboxyl, phosphate groups and proteins of microorganisms were essential in uranium adsorption. Intracellular accumulation was closely related to cellular activity, and the efficiency of uranium processing by the permeabilized bacterial cells was significantly improved. In response to uranium stress, the bacterium was found to release multiple ions in conjunction with uranium adsorption, which facilitates the maintenance of bacterial life activities and the conversion of uranyl to precipitates. These above results indicated that Stenotrophomonas sp. Had great potential application value for the remediation of uranium.
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Affiliation(s)
- Zhongqiang Hu
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China; School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, Jiangxi, China
| | - Zhongkui Zhou
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China; School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, Jiangxi, China.
| | - Yaoyu Zhou
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China; School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, Jiangxi, China; College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China.
| | - Lili Zheng
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Jianping Guo
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China; School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, Jiangxi, China
| | - Yong Liu
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China; School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, Jiangxi, China
| | - Zhanxue Sun
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China; School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, Jiangxi, China
| | - Zhihui Yang
- School of Metallurgy and Environment, Central South University, Changsha 410083, Hunan, China
| | - Xiaoxia Yu
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang 330013, Jiangxi, China; School of Water Resources and Environmental Engineering, East China University of Technology, Nanchang 330013, Jiangxi, China
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6
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Ruiz-Fresneda MA, Fernández-Cantos MV, Gómez-Bolívar J, Eswayah AS, Gardiner PHE, Pinel-Cabello M, Solari PL, Merroun ML. Combined bioreduction and volatilization of Se VI by Stenotrophomonas bentonitica: Formation of trigonal selenium nanorods and methylated species. Sci Total Environ 2023; 858:160030. [PMID: 36356742 DOI: 10.1016/j.scitotenv.2022.160030] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 11/03/2022] [Accepted: 11/03/2022] [Indexed: 06/16/2023]
Abstract
Nowadays, metal pollution due to the huge release of toxic elements to the environment has become one of the world's biggest problems. Bioremediation is a promising tool for reducing the mobility and toxicity of these contaminants (e.g. selenium), being an efficient, environmentally friendly, and inexpensive strategy. The present study describes the capacity of Stenotrophomonas bentonitica to biotransform SeVI through enzymatic reduction and volatilization processes. HAADF-STEM analysis showed the bacterium to effectively reduce SeVI (200 mM) into intra- and extracellular crystalline Se0 nanorods, made mainly of two different Se allotropes: monoclinic (m-Se) and trigonal (t-Se). XAS analysis appears to indicate a Se crystallization process based on the biotransformation of amorphous Se0 into stable t-Se nanorods. In addition, results from headspace analysis by gas chromatography-mass spectometry (GC-MS) revealed the formation of methylated volatile Se species such as DMSe (dimethyl selenide), DMDSe (dimethyl diselenide), and DMSeS (dimethyl selenenyl sulphide). The biotransformation pathways and tolerance are remarkably different from those reported with this bacterium in the presence of SeIV. The formation of crystalline Se0 nanorods could have positive environmental implications (e.g. bioremediation) through the production of Se of lower toxicity and higher settleability with potential industrial applications.
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Affiliation(s)
| | | | | | | | - Philip H E Gardiner
- Biomolecular Sciences Research Centre, Sheffield Hallam University, Sheffield, UK
| | | | - Pier L Solari
- MARS Beamline, Synchrotron SOLEIL, L'Orme des Merisiers, Saint-Aubin, Gif-sur-Yvette Cedex, France
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Song F, Zhang G, Li H, Ma L, Yang N. Comparative transcriptomic analysis of Stenotrophomonas sp. MNB17 revealed mechanisms of manganese tolerance at different concentrations and the role of histidine biosynthesis in manganese removal. Ecotoxicol Environ Saf 2022; 244:114056. [PMID: 36075124 DOI: 10.1016/j.ecoenv.2022.114056] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 08/21/2022] [Accepted: 09/03/2022] [Indexed: 06/15/2023]
Abstract
Bacteria possess protective mechanisms against excess Mn(Ⅱ) to reduce its toxicity. Stenotrophomonas sp. MNB17 showed high Mn(Ⅱ) removal capacity (92.24-99.16 %) by forming Mn-precipitates (MnCO3 and Mn-oxides), whose Mn-oxides content increased with increasing Mn(Ⅱ) concentrations (10-50 mM). Compared with 0 mM Mn(Ⅱ)-stressed cells, transcriptomic analysis identified genes with the same transcriptional trends in 10 mM and 50 mM Mn(Ⅱ)-stressed cells, including genes involved in metal transport, cell envelope homeostasis, and histidine biosynthesis, as well as genes with different transcriptional trends, such as those involved in oxidative stress response, glyoxylate cycle, electron transport, and protein metabolism. The upregulation of histidine biosynthesis and oxidative stress responses were the most prominent features of these metabolisms under Mn(Ⅱ) stress. We confirmed that the increased level of reactive oxygen species was one of the reasons for the increased Mn-oxides formation at high Mn(Ⅱ) concentrations. Metabolite analysis indicated that the enhanced histidine biosynthesis rather than the tricarboxylic acid cycle resulted in an elevated level of α-ketoglutarate, which helped eliminate reactive oxygen species. Consistent with these results, the exogenous addition of histidine significantly reduced the production of reactive oxygen species and Mn-oxides and enhanced the removal of Mn(Ⅱ) as MnCO3. This study is the first to correlate histidine biosynthesis, reactive oxygen species, and Mn-oxides formation at high Mn(Ⅱ) concentrations, providing novel insights into the molecular regulatory mechanisms associated with Mn(Ⅱ) removal in bacteria.
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Affiliation(s)
- Fuhang Song
- School of Light Industry, Beijing Technology and Business University, 11 Fucheng Road, Beijing 100048, China
| | - Guoliang Zhang
- Center of Deep Sea Research, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China
| | - Honghua Li
- School of Light Industry, Beijing Technology and Business University, 11 Fucheng Road, Beijing 100048, China
| | - Linlin Ma
- Griffith Institute for Drug Discovery, Griffith University, Australia; School of Environment and Science, Griffith University, Australia
| | - Na Yang
- CAS Key Laboratory of Experimental Marine Biology, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, 7 Nanhai Road, Qingdao 266071, China; Laboratory for Marine Biology and Biotechnology, Qingdao National Laboratory for Marine Science and Technology, 1 Wenhai Road, Qingdao 266237, China.
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Zhang Y, Mao G, Liu R, Zhou X, Bartlam M, Wang Y. Transcriptome Profiling of Stenotrophomonas sp. Strain WZN-1 Reveals Mechanisms of 2,2',4,4'-Tetrabromodiphenyl Ether (BDE-47) Biotransformation. Environ Sci Technol 2022; 56:11288-11299. [PMID: 35881891 DOI: 10.1021/acs.est.2c00197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
The brominated flame retardant 2,2',4,4'-tetrabromodiphenyl ether (BDE-47) is extensively used, stable, and difficult to degrade in the environment. The existence of BDE-47 could pose a certain risk to the environment and human health. However, the biotransformation mechanisms of BDE-47 by microorganisms remain unclear. In this study, aerobic degradation of BDE-47 by Stenotrophomonas sp. strain WZN-1 and transcriptome analysis were carried out. BDE-47 degradation by Stenotrophomonas sp. strain WZN-1 was mainly through the biological action of intracellular enzymes via the route of debromination and hydroxylation. The results of the transcriptome sequencing indicated the differentially expressed genes were related to transport, metabolism, and stress response. The key processes involved the microbial transmembrane transportation of BDE-47, energy anabolism, synthesis, and metabolism of functional enzymes, stress response, and other biological processes of gene regulation. In particular, bacterial chemotaxis played a potential role in biodegradation of BDE-47 by Stenotrophomonas sp. strain WZN-1. This study provides the first insights into the biotransformation of Stenotrophomonas sp. strain WZN-1 to BED-47 stress and shows potential for application in remediation of polluted environments.
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Affiliation(s)
- Yadi Zhang
- Key Laboratory Processes and Environmental Criteria (Ministry of Education), Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai International Advanced Research Institute (Shenzhen Futian), Nankai University, Tianjin, 300350, China
| | - Guannan Mao
- Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau Research,Chinese Academy of Sciences, Beijing, 100101, China
| | - Ruidan Liu
- Key Laboratory Processes and Environmental Criteria (Ministry of Education), Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai International Advanced Research Institute (Shenzhen Futian), Nankai University, Tianjin, 300350, China
| | - Xinzhu Zhou
- Key Laboratory Processes and Environmental Criteria (Ministry of Education), Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai International Advanced Research Institute (Shenzhen Futian), Nankai University, Tianjin, 300350, China
| | - Mark Bartlam
- College of Life Sciences, State Key Laboratory of Medicinal Chemical Biology, Nankai International Advanced Research Institute (Shenzhen Futian), Nankai University, Tianjin, 300071, China
| | - Yingying Wang
- Key Laboratory Processes and Environmental Criteria (Ministry of Education), Tianjin Key Laboratory of Environmental Remediation and Pollution Control, College of Environmental Science and Engineering, Nankai International Advanced Research Institute (Shenzhen Futian), Nankai University, Tianjin, 300350, China
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9
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Liu Y, Gao J, Wang N, Li X, Fang N, Zhuang X. Diffusible signal factor enhances the saline-alkaline resistance and rhizosphere colonization of Stenotrophomonas rhizophila by coordinating optimal metabolism. Sci Total Environ 2022; 834:155403. [PMID: 35469877 DOI: 10.1016/j.scitotenv.2022.155403] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/02/2022] [Revised: 04/15/2022] [Accepted: 04/16/2022] [Indexed: 06/14/2023]
Abstract
Quorum sensing (QS) regulates various physiological processes in a cell density-dependent mode via cell-cell communication. Stenotrophomonas rhizophila DSM14405T having the diffusible signal factor (DSF)-QS system, is a plant growth-promoting rhizobacteria (PGPR) that enables host plants to tolerate saline-alkaline stress. However, the regulatory mechanism of DSF-QS in S. rhizophila is not fully understood. In this study, we used S. rhizophila DSM14405T wild-type (WT) and an incompetent DSF production rpfF-knockout mutant to explore the regulatory role of QS in S. rhizophila growth, stress responses, biofilm formation, and colonization under saline-alkaline stress. We found that a lack of DSF-QS reduces the tolerance of S. rhizosphere ΔrpfF to saline-alkaline stress, with a nearly 25-fold reduction in the ΔrpfF population compared with WT at 24 h under stress. Transcriptome analysis revealed that QS helps S. rhizophila WT respond to saline-alkaline stress by enhancing metabolism associated with the cell wall and membrane, oxidative stress response, cell adhesion, secretion systems, efflux pumps, and TonB systems. These metabolic systems enhance penetration defense, Na+ efflux, iron uptake, and reactive oxygen species scavenging. Additionally, the absence of DSF-QS causes overexpression of biofilm-associated genes under the regulation of sigma 54 and other transcriptional regulators. However, greater biofilm formation capacity confers no advantage on S. rhizosphere ΔrpfF in rhizosphere colonization. Altogether, our results show the importance of QS in PGPR growth and colonization; QS gives PGPR a collective adaptive advantage in harsh natural environments.
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Affiliation(s)
- Ying Liu
- CAS Key Laboratory of Environment Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; School of Life Sciences, Life Sciences and Medicine, University of Science and Technology of China, Hefei 230026, China
| | - Jie Gao
- CAS Key Laboratory of Environment Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Na Wang
- CAS Key Laboratory of Environment Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Xianglong Li
- CAS Key Laboratory of Environment Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Na Fang
- CAS Key Laboratory of Environment Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Institute of International Rivers and Eco-security, Yunan University, Kunming 650500, China
| | - Xuliang Zhuang
- CAS Key Laboratory of Environment Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China; Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China.
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10
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Peixoto J, Vizzotto C, Ramos A, Alves G, Steindorff A, Krüger R. The role of nitrogen metabolism on polyethylene biodegradation. J Hazard Mater 2022; 432:128682. [PMID: 35306413 DOI: 10.1016/j.jhazmat.2022.128682] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 03/08/2022] [Accepted: 03/09/2022] [Indexed: 06/14/2023]
Abstract
Polyethylene (PE) is the most widely used plastic and its accumulation on natural environments has reached alarming levels causing severe damage to wildlife and human health. Despite the significance of this global issue, little is known about specific metabolic mechanisms behind PE biodegradation-a promising and sustainable remediation method. Herein, we describe a novel role of nitrogen metabolism in the fragmentation and oxidation of PE mediated by biological production of NOx in three PE-degrading strains of Comamonas, Delftia, and Stenotrophomonas. Resultant nitrated PE fragments are assimilated and then metabolized by these bacteria in a process assisted by nitronate monooxygenases and nitroreductases to support microbial growth. Due to the conservation of nitrogen metabolism genes, we anticipate that this oxidative mechanism is potentially shared by other nitrifier and denitrifier microbes.
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Affiliation(s)
- Julianna Peixoto
- Laboratory of Enzymology, Department of Cellular Biology, Biological Sciences Institute, University of Brasilia, Brasilia 70910-900, DF, Brazil.
| | - Carla Vizzotto
- Laboratory of Enzymology, Department of Cellular Biology, Biological Sciences Institute, University of Brasilia, Brasilia 70910-900, DF, Brazil
| | - Alexandre Ramos
- Laboratory of Enzymology, Department of Cellular Biology, Biological Sciences Institute, University of Brasilia, Brasilia 70910-900, DF, Brazil
| | - Gabriel Alves
- Laboratory of Microbiology, Department of Cellular Biology, Biological Sciences Institute, University of Brasilia, Brasilia 70910-900, DF, Brazil
| | - Andrei Steindorff
- Department of Energy (DOE) Joint Genome Institute, 2800 Mitchell Drive, Walnut Creek, CA 94598, USA
| | - Ricardo Krüger
- Laboratory of Enzymology, Department of Cellular Biology, Biological Sciences Institute, University of Brasilia, Brasilia 70910-900, DF, Brazil.
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11
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Changmei L, Gengrui W, Haizhen W, Yuxiao W, Shuang Z, Chaohai W. Kinetics and molecular mechanism of enhanced fluoranthene biodegradation by co-substrate phenol in co-culture of Stenotrophomonas sp. N5 and Advenella sp. B9. Environ Res 2022; 205:112413. [PMID: 34861230 DOI: 10.1016/j.envres.2021.112413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Revised: 11/16/2021] [Accepted: 11/16/2021] [Indexed: 06/13/2023]
Abstract
Polycyclic aromatic hydrocarbons (PAHs) and phenol are persistent pollutants that coexist in coking wastewater (CWW). Fluoranthene (Flu) is the predominant PAH species in the CWW treatment system. Our work emphasized on distinguishing the effects of phenol on Flu biodegradation by co-culture of Stenotrophomonas sp. N5 and Advenella sp. B9 and illustrated the molecular mechanisms. Results showed Flu biodegradation by co-culture was enhanced by phenol. According to the first-order degradation kinetic analysis of Flu, phenol significantly increased the biodegradation rate constant and shortened the half-life of Flu. Transcriptome analysis pointed out the up-regulation of DNA repair activity and 3717 significantly differentially expressed genes (DEGs), were triggered by 800 mg/L phenol. GO enrichment analysis suggested these DEGs are mainly concentrated in biochemical processes such as metal ion binding and alpha-amino acid biosynthesis, which are closely associated with Flu biodegradation, indicating that phenol promotes DNA repair activity and reduces Flu genotoxicity. qRT-PCR was performed to detect the gene expression of aromatic ring-opening dioxygenase. Combined with transcriptome analysis, the qRT-PCR results suggested phenol did not induce the expression of related PAHs-degrading enzymes. RNA extraction and microbial growth curves of COC and COC + Ph provided further evidence that phenol serves as co-substrate which increases biomass and the concentration of degrading enzymes, therefore promoting the Flu degradation.
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Affiliation(s)
- Li Changmei
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Wei Gengrui
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
| | - Wu Haizhen
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China.
| | - Wang Yuxiao
- School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, China
| | - Zhu Shuang
- Cener for Bioresources & Drug Discovery and School of Biosciences and Biopharmaceutics, Guangdong Pharmaceutical University, Guangzhou, 510006, China
| | - Wei Chaohai
- School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China
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12
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Tzec-Interián JA, Desgarennes D, Carrión G, Monribot-Villanueva JL, Guerrero-Analco JA, Ferrera-Rodríguez O, Santos-Rodríguez DL, Liahut-Guin N, Caballero-Reyes GE, Ortiz-Castro R. Characterization of plant growth-promoting bacteria associated with avocado trees (Persea americana Miller) and their potential use in the biocontrol of Scirtothrips perseae (avocado thrips). PLoS One 2020; 15:e0231215. [PMID: 32267901 PMCID: PMC7141680 DOI: 10.1371/journal.pone.0231215] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 03/18/2020] [Indexed: 11/25/2022] Open
Abstract
Plants interact with a great variety of microorganisms that inhabit the rhizosphere or the epiphytic and endophytic phyllosphere and that play critical roles in plant growth as well as the biocontrol of phytopathogens and insect pests. Avocado fruit damage caused by the thrips species Scirtothrips perseae leads to economic losses of 12–51% in many countries. In this study, a screening of bacteria associated with the rhizosphere or endophytic phyllosphere of avocado roots was performed to identify bacterial isolates with plant growth-promoting activity in vitro assays with Arabidopsis seedlings and to assess the biocontrol activity of the isolates against Scirtothrips perseae. The isolates with beneficial, pathogenic and/or neutral effects on Arabidopsis seedlings were identified. The plant growth-promoting bacteria were clustered in two different groups (G1 and G3B) based on their effects on root architecture and auxin responses, particularly bacteria of the Pseudomonas genus (MRf4-2, MRf4-4 and TRf2-7) and one Serratia sp. (TS3-6). Twenty strains were selected based on their plant growth promotion characteristics to evaluate their potential as thrips biocontrol agents. Analyzing the biocontrol activity of S. perseae, it was identified that Chryseobacterium sp. shows an entomopathogenic effect on avocado thrips survival. Through the metabolic profiling of compounds produced by bacteria with plant growth promotion activity, bioactive cyclodipeptides (CDPs) that could be responsible for the plant growth-promoting activity in Arabidopsis were identified in Pseudomonas, Serratia and Stenotrophomonas. This study unravels the diversity of bacteria from the avocado rhizosphere and highlights the potential of a unique isolate to achieve the biocontrol of S. perseae.
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Affiliation(s)
| | - Damaris Desgarennes
- Red de Biodiversidad y Sistemática, Instituto de Ecología, Xalapa, Veracruz, México
| | - Gloria Carrión
- Red de Biodiversidad y Sistemática, Instituto de Ecología, Xalapa, Veracruz, México
- * E-mail: (ROC); (GC)
| | | | | | | | | | - Nut Liahut-Guin
- Red de Biodiversidad y Sistemática, Instituto de Ecología, Xalapa, Veracruz, México
| | | | - Randy Ortiz-Castro
- Red de Estudios Moleculares Avanzados, Instituto de Ecología, Xalapa, Veracruz, México
- Catedratico-CONACyT en el Instituto de Ecología A. C., Xalapa, Veracruz, México
- * E-mail: (ROC); (GC)
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13
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Ruiz-Fresneda MA, Gomez-Bolivar J, Delgado-Martin J, Abad-Ortega MDM, Guerra-Tschuschke I, Merroun ML. The Bioreduction of Selenite under Anaerobic and Alkaline Conditions Analogous to Those Expected for a Deep Geological Repository System. Molecules 2019; 24:molecules24213868. [PMID: 31717840 PMCID: PMC6865132 DOI: 10.3390/molecules24213868] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Revised: 10/21/2019] [Accepted: 10/22/2019] [Indexed: 12/23/2022] Open
Abstract
The environmental conditions for the planned geological disposal of radioactive waste —including hyper-alkaline pH, radiation or anoxia—are expected to be extremely harsh for microbial activity. However, it is thought that microbial communities will develop in these repositories, and this would have implications for geodisposal integrity and the control of radionuclide migration through the surrounding environment. Nuclear waste contains radioactive isotopes of selenium (Se) such as 79Se, which has been identified as one of the main radionuclides in a geodisposal system. Here, we use the bacterial species Stenotrophomonas bentonitica, isolated from bentonites serving as an artificial barrier reference material in repositories, to study the reduction of selenite (SeIV) under simulated geodisposal conditions. This bacterium is able to reduce toxic SeIV anaerobically from a neutral to alkaline initial pH (up to pH 10), thereby producing elemental selenium (Se0) nanospheres and nanowires. A transformation process from amorphous Se (a-Se) nanospheres to trigonal Se (t-Se) nanowires, through the formation of monoclinic Se (m-Se) aggregates as an intermediate step, is proposed. The lesser solubility of Se0 and t-Se makes S. bentonitica a potential candidate to positively influence the security of a geodisposal system, most probably with lower efficiency rates than those obtained aerobically.
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Affiliation(s)
- Miguel Angel Ruiz-Fresneda
- Department of Microbiology, University of Granada, 18071 Granada, Spain; (J.G.-B.); (J.D.-M.); (M.L.M.)
- Correspondence:
| | - Jaime Gomez-Bolivar
- Department of Microbiology, University of Granada, 18071 Granada, Spain; (J.G.-B.); (J.D.-M.); (M.L.M.)
| | - Josemaria Delgado-Martin
- Department of Microbiology, University of Granada, 18071 Granada, Spain; (J.G.-B.); (J.D.-M.); (M.L.M.)
| | - Maria del Mar Abad-Ortega
- Centro de Instrumentación Científica (CIC), University of Granada, 18071 Granada, Spain; (M.d.M.A.-O.); (I.G.-T.)
| | - Isabel Guerra-Tschuschke
- Centro de Instrumentación Científica (CIC), University of Granada, 18071 Granada, Spain; (M.d.M.A.-O.); (I.G.-T.)
| | - Mohamed Larbi Merroun
- Department of Microbiology, University of Granada, 18071 Granada, Spain; (J.G.-B.); (J.D.-M.); (M.L.M.)
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14
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Sodhi KK, Kumar M, Balan B, Dhaulaniya AS, Singh DK. Isolation and characterization of amoxicillin-resistant bacteria and amoxicillin-induced alteration in its protein profiling and RNA yield. Arch Microbiol 2019; 202:225-232. [PMID: 31598755 DOI: 10.1007/s00203-019-01737-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2019] [Revised: 09/06/2019] [Accepted: 09/24/2019] [Indexed: 11/26/2022]
Abstract
Amoxicillin-resistant bacteria were isolated using selective enrichment procedure. The morphological, biochemical and molecular characterization based on 16S rRNA gene sequencing and phylogenetic analysis of the bacterial strain WA5 confirmed that the strain belongs to the genus Stenotrophomonas. The bacteria were named as Stenotrophomonas sp. strain WA5 (MK110499). Substantial growth was seen in M9 minimal media supplemented with 5 mg L-1 of amoxicillin as a sole source of carbon and energy. RNA yield was also observed to be decreased in the presence of amoxicillin. Amoxicillin (5 mg L-1)-induced alteration is seen on bacterial protein profile and unique polypeptide bands were seen to be induced in the presence of amoxicillin, the bands were subjected to trypsin digestion, and LC-MS/MS analysis showed that the bands belong to the family of DNA-dependent RNA polymerase subunit β (rpoC). Plasmid DNA isolation indicated the presence of antibiotic-resistant genes being harboured by the plasmid.
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Affiliation(s)
- Kushneet Kaur Sodhi
- Soil Microbial Ecology and Environmental Toxicology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Mohit Kumar
- Soil Microbial Ecology and Environmental Toxicology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Biji Balan
- Soil Microbial Ecology and Environmental Toxicology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Amit Singh Dhaulaniya
- Soil Microbial Ecology and Environmental Toxicology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007, India
| | - Dileep Kumar Singh
- Soil Microbial Ecology and Environmental Toxicology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007, India.
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15
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Nguyen VK, Park Y, Lee T. Microbial antimonate reduction with a solid-state electrode as the sole electron donor: A novel approach for antimony bioremediation. J Hazard Mater 2019; 377:179-185. [PMID: 31158587 DOI: 10.1016/j.jhazmat.2019.05.069] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 05/01/2019] [Accepted: 05/26/2019] [Indexed: 06/09/2023]
Abstract
The anaerobic antimonate [Sb(V)] reduction with a solid-state electrode serving as the sole electron donor was demonstrated by employing a bioelectrochemical system. The highest Sb(V) reduction efficiency was observed at the biocathode potential of -0.7 V versus standard hydrogen electrode using a cathode potential range from -0.5 V to -1.1 V. The scanning electron microscopy and energy dispersive X-ray spectroscopy indicated that both amorphous and crystallized Sb2O3 were formed as products of Sb(V) reduction. The irreversible recovery of bioelectrochemical Sb(V), when the cathode potential deviated from the optimal potential, was explained through the alteration in microbial communities, which was further elucidated by the next-generation sequencing of 16S rRNA gene amplicons. Chryseobacterium koreense and Stenotrophomonas nitritireducens were the dominant species of microbial consortia at Sb(V)-reducing biocathodes. This study revealed a novel option for bioremediation of Sb at underground contaminated sites, where the delivery of organic electron donors is limited or ineffective.
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Affiliation(s)
- Van Khanh Nguyen
- Department of Microbiology, Pusan National University, Busan 46241, Republic of Korea.
| | - Younghyun Park
- Department of Civil and Environmental Engineering, Pusan National University, Busan 46241, Republic of Korea
| | - Taeho Lee
- Department of Civil and Environmental Engineering, Pusan National University, Busan 46241, Republic of Korea.
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16
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Xie H, Zhu L, Wang J. Combined treatment of contaminated soil with a bacterial Stenotrophomonas strain DXZ9 and ryegrass (Lolium perenne) enhances DDT and DDE remediation. Environ Sci Pollut Res Int 2018; 25:31895-31905. [PMID: 29354855 DOI: 10.1007/s11356-018-1236-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2017] [Accepted: 01/05/2018] [Indexed: 06/07/2023]
Abstract
Bioremediation of contaminated soils by a combinational approach using specific bacterial species together with ryegrass is a promising strategy, resulting in potentially highly efficient degradation of organic contaminants. The present study tested the combination of strain DXZ9 of Stenotrophomonas sp. with ryegrass to remove DDT and DDE contaminants from soil under natural conditions in a pot experiment. The strain DXZ9 was successfully colonized in the natural soil, resulting in removal rates of approximately 77% for DDT, 52% for DDE, and 65% for the two pollutants combined after 210 days. Treatment with ryegrass alone resulted in slightly lower removal rates (72 and 48%, respectively, 61% for both combined), while the combination of strain DXZ9 and ryegrass significantly (p < 0.05) improved the removal rates to 81% for DDT and 55% for DDE (69% for both). The half-life of the contaminants was significantly shorter in combined treatment with DXZ9 and ryegrass compared to the control. The remediation was mostly due to degradation of the contaminants, as the net uptake of DDT and DDE by the ryegrass accounted for less than 3% of the total amount in the soil. DDT is reductively dechlorinated to DDD and dehydrochlorinated to DDE in the soil; the metabolites of DDE and DDD were multiple undefined substances. The toxicity of the soil was significantly reduced as a result of the treatment. The present study demonstrates that the bioremediation of soil contaminated with DDT and DDE by means of specific bacteria combined with ryegrass is feasible.
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Affiliation(s)
- Hui Xie
- Key Laboratory of Agricultural Environment in Universities of Shandong, College of Resources and Environment, Shandong Agricultural University, Taian, 271018, China.
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shandong Agricultural University, Taian, 271018, China.
| | - Lusheng Zhu
- Key Laboratory of Agricultural Environment in Universities of Shandong, College of Resources and Environment, Shandong Agricultural University, Taian, 271018, China.
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shandong Agricultural University, Taian, 271018, China.
| | - Jun Wang
- Key Laboratory of Agricultural Environment in Universities of Shandong, College of Resources and Environment, Shandong Agricultural University, Taian, 271018, China
- National Engineering Laboratory for Efficient Utilization of Soil and Fertilizer Resources, Shandong Agricultural University, Taian, 271018, China
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17
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Fang H, Deng Y, Ge Q, Mei J, Zhang H, Wang H, Yu Y. Biodegradability and ecological safety assessment of Stenotrophomonas sp. DDT-1 in the DDT-contaminated soil. Ecotoxicol Environ Saf 2018; 158:145-153. [PMID: 29679846 DOI: 10.1016/j.ecoenv.2018.04.026] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Revised: 03/26/2018] [Accepted: 04/12/2018] [Indexed: 06/08/2023]
Abstract
The biodegradability and ecological safety assessment of the previously isolated DDT-degrading bacterial strain Stenotrophomonas sp. DDT-1 were investigated in the DDT-contaminated soil under laboratory and field conditions. Under laboratory conditions, the degradation rates of fresh p,p'-DDT in soil were enhanced by 2.0-3.0-fold with the introduction of the strain DDT-1 compared to those of the control treatments. A similar enhancement in the dissipation of DDTs (p,p'-DDT, p,p'-DDE, p,p'-DDD, and o,p'-DDT) in the aged DDT-contaminated field plot soils resulted from the inoculation with this strain. Meanwhile, the degradation rates of DDTs increased by 2.9-5.5- and 2.8-7.6-fold in the inoculated greenhouse and open field soils, respectively, after field demonstration application of strain DDT-1 preparation. Moreover, no significant differences in the soil enzyme activity, microbial functional diversity, and bacterial community structure were observed between the inoculated and un-inoculated field soils, but several soil microbial genera exhibited some fluctuations in abundance. It is concluded that strain DDT-1 could accelerate the removal of DDTs residues in field soils, and furthermore, its inoculation was ecologically safe.
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Affiliation(s)
- Hua Fang
- Institute of Pesticide and Environmental Toxicology, College of Agriculture & Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Yanfei Deng
- Institute of Pesticide and Environmental Toxicology, College of Agriculture & Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Qiqing Ge
- Institute of Pesticide and Environmental Toxicology, College of Agriculture & Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Jiajia Mei
- Institute of Pesticide and Environmental Toxicology, College of Agriculture & Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Houpu Zhang
- Institute of Pesticide and Environmental Toxicology, College of Agriculture & Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Huifang Wang
- Institute of Pesticide and Environmental Toxicology, College of Agriculture & Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Yunlong Yu
- Institute of Pesticide and Environmental Toxicology, College of Agriculture & Biotechnology, Zhejiang University, Hangzhou 310058, China.
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18
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Zhao Q, Bilal M, Yue S, Hu H, Wang W, Zhang X. Identification of biphenyl 2, 3-dioxygenase and its catabolic role for phenazine degradation in Sphingobium yanoikuyae B1. J Environ Manage 2017; 204:494-501. [PMID: 28930694 DOI: 10.1016/j.jenvman.2017.09.027] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 09/06/2017] [Accepted: 09/08/2017] [Indexed: 06/07/2023]
Abstract
Phenazines are important nitrogen-containing secondary metabolites that display a range of biological functionalities. However, these compounds have shown lethal effects on humans and, the fate of phenazine in the ecosystem remains uncertain. In this study, we investigated that Sphingobium yanoikuyae B1 could utilize phenazine as a sole carbon source for growth. Intermediate produced during phenazine degradation was purified and identified as 1, 2-dihydrogen 1, 2-dihydroxy phenazine. Biphenyl 2, 3-dioxygenase was determined to be the initial dioxygenase for phenazine degradation through gene cloning and whole cell transformation techniques. Phenazine was converted to 1, 2-dihydrogen 1, 2-dihydroxy phenazine through hydrogenation and hydroxylation, which then transformed to 2-hydroxy phenazine through spontaneous dehydration. ThebphA1fA2f, were evidenced to be the only genes encoding the initial dioxygenase for phenazine degradation. BphB (dihydrodiol dehydrogenase) and BphC (2,3-dihydroxybiphenyl 1,2-dioxygenase) did not exhibit any 1, 2-dihydrogen 1, 2-dihydroxy phenazine and 1, 2-dihydroxy phenazine degradation capability, suggesting no contribution in phenazine degradation. Phylogenetic analysis of the dioxygenases demonstrated enormous biodegradation potential in strain B1. In conclusion, this study opens up new possibilities in better understanding the phenazine degradation in the environment.
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Affiliation(s)
- Qiang Zhao
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Muhammad Bilal
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Shengjie Yue
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Hongbo Hu
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China; National Experimental Teaching Center for Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China.
| | - Wei Wang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Xuehong Zhang
- State Key Laboratory of Microbial Metabolism, School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, Shanghai, 200240, China
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Abstract
In this study, a bacterial strain, CH-1, capable of degrading 3-bromocarbazole (3-BCZ) was isolated from a polluted soil. Based on its physio-biochemical characteristics and 16S rRNA genes, strain CH-1 was identified as a Stenotrophomonas sp. Strain CH-1 was able to degrade 70% of 50 mg/L 3-BCZ within 8 d at pH 7.0 and 30°C in mineral salt medium (MSM). During the process, the main intermediate metabolite was identified as (2E, 4Z)-6-(2-amino-5-bromophenyl)-2-hydroxy-6-oxhexa-2, 4-dienoic by gas (2E, 4Z)-6-(2-amino-5-bromophenyl)-2-hydroxy-6-oxhexa-2,4-dienoic via gas chromatograph-mass spectrometry (GC-MS) analysis. The metabolite disappeared after 14 d, suggesting that the metabolite can also be degraded by strain CH-1. 3-BCZ is a new persistent organic pollutant. This is the first report of the biodegradation of 3-BCZ. The results indicated that strain CH-1 may be a promising bacterial candidate for the bioremediation of environments polluted with polyhalogenated carbazoles (PHCs).
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Affiliation(s)
- Yun Ma
- a Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment , Zhejiang University of Technology , Hangzhou , People's Republic of China
| | - Zhiwei Li
- a Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment , Zhejiang University of Technology , Hangzhou , People's Republic of China
| | - Mei Yuan
- a Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment , Zhejiang University of Technology , Hangzhou , People's Republic of China
| | - Linhua Chen
- b Environmental Science Research Institute of Taizhou City , Taizhou , China
| | - Shanshan Zhou
- a Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment , Zhejiang University of Technology , Hangzhou , People's Republic of China
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20
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Mishra S, Singh BR, Naqvi AH, Singh HB. Potential of biosynthesized silver nanoparticles using Stenotrophomonas sp. BHU-S7 (MTCC 5978) for management of soil-borne and foliar phytopathogens. Sci Rep 2017; 7:45154. [PMID: 28345581 PMCID: PMC5366874 DOI: 10.1038/srep45154] [Citation(s) in RCA: 66] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Accepted: 02/21/2017] [Indexed: 01/23/2023] Open
Abstract
Stenotrophomonas sp. is emerging as a popular microbe of global concern with various potential ecological roles. Biosynthesis of gold and silver nanoparticles (AgNPs) using this bacterial strain has shown promising applications in life sciences. However, there is no report on efficient agricultural applications of biosynthesized AgNPs using Stenotrophomonas sp. In this regard, successful biosynthesis of AgNPs using Stenotrophomonas sp. BHU-S7 (MTCC 5978) was monitored by Uv-visible spectrum showing surface plasmon resonance (SPR) peak at 440 nm. The biosynthesized AgNPs were spherical with an average mean size of ~12 nm. The antifungal efficacy of biosynthesized AgNPs against foliar and soil-borne phytopathogens was observed. The inhibitory impact of AgNPs (2, 4, 10 μg/ml) on conidial germination was recorded under in vitro conditions. Interestingly, sclerotia of Sclerotium rolfsii exposed to AgNPs failed to germinate on PDA medium and in soil system. Moreover, AgNPs treatment successfully managed collar rot of chickpea caused by S. rolfsii under greenhouse conditions. The reduced sclerotia germination, phenolic acids induction, altered lignification and H2O2 production was observed to be the probable mechanisms providing protection to chickpea against S. rolfsii. Our data revealed that AgNPs treated plants are better equipped to cope with pathogen challenge pointing towards their robust applications in plant disease management.
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Affiliation(s)
- Sandhya Mishra
- Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, 221005, India
| | - Braj Raj Singh
- Centre of Excellence in Materials Science (Nanomaterials), Department of Applied Physics, Z. H. College of Engineering and Technology, Aligarh Muslim University, Aligarh, India
| | - Alim H. Naqvi
- Centre of Excellence in Materials Science (Nanomaterials), Department of Applied Physics, Z. H. College of Engineering and Technology, Aligarh Muslim University, Aligarh, India
| | - H. B. Singh
- Department of Mycology and Plant Pathology, Institute of Agricultural Sciences, Banaras Hindu University, Varanasi, 221005, India
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Peixoto J, Silva LP, Krüger RH. Brazilian Cerrado soil reveals an untapped microbial potential for unpretreated polyethylene biodegradation. J Hazard Mater 2017; 324:634-644. [PMID: 27889181 DOI: 10.1016/j.jhazmat.2016.11.037] [Citation(s) in RCA: 87] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 10/07/2016] [Accepted: 11/13/2016] [Indexed: 05/16/2023]
Abstract
Discarded PE-based products pose a social and environmental threat because of their recalcitrance to degradation, a consequence of the unique set of PE's physicochemical properties. In this study we isolated nine novel PE-degrading bacteria from plastic debris found in soil of the savanna-like Brazilian Cerrado. These bacterial strains from the genera Comamonas, Delftia, and Stenotrophomonas showed metabolic activity and cellular viability after a 90-day incubation with PE as the sole carbon source. ATR/FTIR indicated that biodegraded PE undergone oxidation, vinylene formation, chain scission, among other chemical changes. Considerable nanoroughness shifts and vast damages to the micrometric surface were confirmed by AFM and SEM. Further, phase imaging revealed a 46.7% decrease in the viscous area of biodegraded PE whereas Raman spectroscopy confirmed a loss in its crystalline content, suggesting the assimilation of smaller fragments. Intriguingly, biodegraded PE chemical fingerprint suggests that these strains use novel biochemical strategies in the biodegradation process. Our results indicate that these microbes are capable of degrading unpretreated PE of very high molecular weight (191,000gmol-1) and survive for long periods under this condition, suggesting not only practical applications in waste management and environmental decontamination, but also future directions to understand the unraveled metabolism of synthetic polymers.
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Affiliation(s)
- Julianna Peixoto
- Laboratory of Enzymology, Cellular Biology Department, Biological Sciences Institute, University of Brasilia, Brasilia, 70910-900, DF, Brazil.
| | - Luciano P Silva
- Laboratory of Nanobiotechnology, Embrapa Genetic Resources and Biotechnology, Brasilia, 70770-917, DF, Brazil.
| | - Ricardo H Krüger
- Laboratory of Enzymology, Cellular Biology Department, Biological Sciences Institute, University of Brasilia, Brasilia, 70910-900, DF, Brazil.
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22
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Gargouri B, Contreras MDM, Ammar S, Segura-Carretero A, Bouaziz M. Biosurfactant production by the crude oil degrading Stenotrophomonas sp. B-2: chemical characterization, biological activities and environmental applications. Environ Sci Pollut Res Int 2017; 24:3769-3779. [PMID: 27889889 DOI: 10.1007/s11356-016-8064-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 11/07/2016] [Indexed: 06/06/2023]
Abstract
In this work, biosurfactant-producing microorganisms were isolated from hydrocarbon-contaminated water collected from Tunisian oilfield. After enrichment and isolation, different bacterial strains were preliminary studied for their biosurfactant/bioemulsifier properties when using crude oil as the unique carbon source. In particular, the isolate strain B-2, a Gram-negative, rod-shaped bacterium, efficiently emulsified crude oil. The extracellular biosurfactant product from this strain presented an emulsification activity above 70% and a hydrophobicity of 71%. In addition, a diameter of 6 cm was observed in the oil displacement test. The characterization of B-2 strain using 16S rDNA sequencing enables us to find a high degree of similarity with various members of the genus Stenotrophomonas (with a percentage of similarity of 99%). The emulsification activity of Stenotrophomonas biosurfactant B-2 was maintained in a wide range of pH (2 to 6), temperature (4 to 55 °C), and salinity (0 to 50 g L-1) conditions. It also enhanced the solubility of phenanthrene in water and could be used in the re-mobilization of hydrocarbon-contaminated environment. In addition, this biosurfactant exhibited antimicrobial and antioxidant properties. Infrared spectroscopy suggested potential lipidic and peptidic moieties, and mass spectrometry-based analyses showed that the biosurfactant contains mainly cyclic peptidic structures belonging to the class of diketopiperazines. Therefore, the B-2 strain is a promising biosurfactant-producing microorganism and its derived biosurfactant presents a wide range of industrial applications.
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Affiliation(s)
- Boutheina Gargouri
- Laboratoire d'Electrochimie et Environnement, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax, BP 1173, 3038, Sfax, Tunisia
- Institut Supérieur de Biotechnologie de Sfax, Université de Sfax, BP 1175, 3038, Sfax, Tunisia
| | - María Del Mar Contreras
- Research and Development Functional Food Centre (CIDAF), Bioregión Building, Health Science Technological Park, Avda. del Conocimiento s/n, 18016, Granada, Spain.
- Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva s/n, 18071, Granada, Spain.
- Department of Analytical Chemistry, Campus of Rabanales, University of Córdoba, 14071, Córdoba, Spain.
| | - Sonda Ammar
- Laboratoire d'Electrochimie et Environnement, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax, BP 1173, 3038, Sfax, Tunisia
| | - Antonio Segura-Carretero
- Research and Development Functional Food Centre (CIDAF), Bioregión Building, Health Science Technological Park, Avda. del Conocimiento s/n, 18016, Granada, Spain
- Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Avda. Fuentenueva s/n, 18071, Granada, Spain
| | - Mohamed Bouaziz
- Laboratoire d'Electrochimie et Environnement, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax, BP 1173, 3038, Sfax, Tunisia
- Institut Supérieur de Biotechnologie de Sfax, Université de Sfax, BP 1175, 3038, Sfax, Tunisia
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23
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Gandolfi I, Canedoli C, Imperato V, Tagliaferri I, Gkorezis P, Vangronsveld J, Padoa Schioppa E, Papacchini M, Bestetti G, Franzetti A. Diversity and hydrocarbon-degrading potential of epiphytic microbial communities on Platanus x acerifolia leaves in an urban area. Environ Pollut 2017; 220:650-658. [PMID: 27745913 DOI: 10.1016/j.envpol.2016.10.022] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 10/05/2016] [Accepted: 10/07/2016] [Indexed: 06/06/2023]
Abstract
Plants and their associated bacteria have been suggested to play a role in air pollution mitigation, especially in urban areas. Particularly, epiphytic bacteria might be able to degrade atmospheric hydrocarbons. However, phyllospheric bacterial communities are highly variable depending on several factors, e.g. tree species, leaf age and physiology, environmental conditions. In this work, bacterial communities hosted by urban Platanus x acerifolia leaves were taxonomically characterized using high throughput sequencing of 16S rRNA gene, and their temporal and spatial variability was assessed by comparing samples collected from different locations in the city of Milan (Italy) and in different months. The diversity of alkane hydroxylase (alkB) phylotypes harboured by phyllospheric bacteria associated to urban Platanus trees was also evaluated. Results revealed that temporal changes, which are related to seasonality, acted as a stronger driver both on Platanus phyllospheric community structure and on alkB phylotype diversity than sampling location. Biodiversity of bacterial communities decreased along the growing season, leading to a strong dominance by the genus Stenotrophomonas. On the contrary, diversity of hydrocarbon-degrading populations increased over the months, although it resulted lower than that reported for other habitats. It was therefore hypothesized that atmospheric hydrocarbons might play a key role in the selection of phyllospheric populations in urban areas.
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Affiliation(s)
- Isabella Gandolfi
- Dept. of Earth and Environmental Sciences, University of Milano-Bicocca, Milan, Italy.
| | - Claudia Canedoli
- Dept. of Earth and Environmental Sciences, University of Milano-Bicocca, Milan, Italy
| | - Valeria Imperato
- Dept. of Earth and Environmental Sciences, University of Milano-Bicocca, Milan, Italy
| | - Ilario Tagliaferri
- Dept. of Earth and Environmental Sciences, University of Milano-Bicocca, Milan, Italy
| | | | - Jaco Vangronsveld
- Centre for Environmental Sciences, Hasselt University, Hasselt, Belgium
| | - Emilio Padoa Schioppa
- Dept. of Earth and Environmental Sciences, University of Milano-Bicocca, Milan, Italy
| | - Maddalena Papacchini
- INAIL, Dipartimento Innovazioni Tecnologiche e Sicurezza degli Impianti, Prodotti ed Insediamenti Antropici, Rome, Italy
| | - Giuseppina Bestetti
- Dept. of Earth and Environmental Sciences, University of Milano-Bicocca, Milan, Italy
| | - Andrea Franzetti
- Dept. of Earth and Environmental Sciences, University of Milano-Bicocca, Milan, Italy
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24
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Ortega RA, Mahnert A, Berg C, Müller H, Berg G. The plant is crucial: specific composition and function of the phyllosphere microbiome of indoor ornamentals. FEMS Microbiol Ecol 2016. [PMID: 27624084 DOI: 10.1093/femsec-fiw173] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/06/2023] Open
Abstract
The plant microbiome is a key determinant of plant health. Less is known about the phyllosphere microbiota and its driving factors in built environments. To study the variability of the microbiome in relation to plant genotype and climate under different controlled conditions, we investigated 14 phylogenetically diverse plant species grown in the greenhouses of the Botanical Garden in Graz (Austria). All investigated plants showed specific bacterial abundances of up to 10(6) CFU cm(-2) on their leaves. Bacterial diversity (H('): 2.4-7.9) and number of putative OTUs (461-2013) were strongly plant species dependent. Statistical analysis showed a significantly higher correlation of community composition to plant genotype in comparison to the ambient climatic variables. In addition to the microbiome structure, we studied the antagonistic potential towards the foliar pathogen Botrytis cinerea as functional indicator. A high proportion of isolates (up to 58%) were able to inhibit pathogen growth by production of volatile organic compounds (VOCs). Data of structure and function were linked: frequently isolated VOCs producers (e.g. Bacillus and Stenotrophomonas) were highly present in phyllosphere communities, which were dominated by members of Firmicutes This study indicates that indoor ornamentals feature a distinct, stable microbiota on leaves irrespective of the indoor climate.
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Affiliation(s)
- Rocel Amor Ortega
- Institute of Environmental Biotechnology, Graz University of Technology, 8010 Graz, Austria University of the Philippines Baguio, 2600 Baguio City, Philippines
| | - Alexander Mahnert
- Institute of Environmental Biotechnology, Graz University of Technology, 8010 Graz, Austria
| | - Christian Berg
- Institute of Plant Sciences, University of Graz, 8010 Graz, Austria
| | - Henry Müller
- Institute of Environmental Biotechnology, Graz University of Technology, 8010 Graz, Austria
| | - Gabriele Berg
- Institute of Environmental Biotechnology, Graz University of Technology, 8010 Graz, Austria
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25
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Lin X, Mou R, Cao Z, Xu P, Wu X, Zhu Z, Chen M. Characterization of cadmium-resistant bacteria and their potential for reducing accumulation of cadmium in rice grains. Sci Total Environ 2016; 569-570:97-104. [PMID: 27341110 DOI: 10.1016/j.scitotenv.2016.06.121] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/15/2016] [Revised: 06/15/2016] [Accepted: 06/15/2016] [Indexed: 05/27/2023]
Abstract
Cadmium (Cd) pollution is a serious widespread environmental problem that not only destroys the microbial ecology of soil and decreases crop production, but also poses a serious risk to human health. Many methods have been used for the remediation of Cd pollution but none of these is totally satisfactory. Microbial remediation strategies have attracted increasing interest since they are environmentally friendly and cost-effective. In the present study, three Cd-resistant bacteria were isolated and evaluated for potential application in Cd bioremediation. Based on their morphological, physiological and biochemical characteristics, together with 16S rDNA gene sequence analyses, bacteria were identified as Stenotrophomonas acidaminiphila (2#), Pseudomonas aeruginosa (9#) and Delftia tsuruhatensis (12#). Pseudomonas aeruginosa showed very high tolerance to metals, especially Cd (2200mg/L), Zn (1800mg/L) and Pb (1200mg/L), and is thought to be a multi-metal-resistant bacterium. Pseudomonas aeruginosa was also sensitive to 13 different antibiotics. The effects of the bacterial strains on the growth of rice plants and their ability to reduce Cd accumulation from Cd-contaminated soils in pot experiments were also evaluated. For Oryza sativa L. A grown in contaminated soil (3mg/kg Cd), the accumulation of Cd was decreased by 31.2 and 25.5% in brown rice and polished rice, respectively, by strain 9#; Pseudomonas aeruginosa was more effective in reducing Cd accumulation in rice grains than a mixture of strains. For Oryza sativa L. B, a mixture of strains acting synergistically was more effective than a single strain in reducing Cd accumulation; treatment with mixed strains (strains+3mg/kg Cd) resulted in 41.3, 35.9, and 32.6% reductions in Cd accumulation in unhulled rice, brown rice and polished rice, respectively. Although different results were obtained for two rice varieties, it can still be concluded that Cd-resistant bacteria are suitable for reducing Cd accumulation in rice grains and show potential for bioremediation of Cd-contaminated soils.
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Affiliation(s)
- Xiaoyan Lin
- China National Rice Research Institute, Hangzhou 310006, China; Laboratory of Quality & Safety Risk Assessment for Rice (Hangzhou), Ministry of Agriculture, Hangzhou 310006, China
| | - Renxiang Mou
- China National Rice Research Institute, Hangzhou 310006, China; Laboratory of Quality & Safety Risk Assessment for Rice (Hangzhou), Ministry of Agriculture, Hangzhou 310006, China
| | - Zhaoyun Cao
- China National Rice Research Institute, Hangzhou 310006, China; Laboratory of Quality & Safety Risk Assessment for Rice (Hangzhou), Ministry of Agriculture, Hangzhou 310006, China
| | - Ping Xu
- China National Rice Research Institute, Hangzhou 310006, China; Laboratory of Quality & Safety Risk Assessment for Rice (Hangzhou), Ministry of Agriculture, Hangzhou 310006, China
| | - Xiaoliang Wu
- China National Rice Research Institute, Hangzhou 310006, China; Laboratory of Quality & Safety Risk Assessment for Rice (Hangzhou), Ministry of Agriculture, Hangzhou 310006, China
| | - Zhiwei Zhu
- China National Rice Research Institute, Hangzhou 310006, China; Laboratory of Quality & Safety Risk Assessment for Rice (Hangzhou), Ministry of Agriculture, Hangzhou 310006, China
| | - Mingxue Chen
- China National Rice Research Institute, Hangzhou 310006, China; Laboratory of Quality & Safety Risk Assessment for Rice (Hangzhou), Ministry of Agriculture, Hangzhou 310006, China.
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26
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Kartik VP, Jinal HN, Amaresan N. Characterization of cadmium-resistant bacteria for its potential in promoting plant growth and cadmium accumulation in Sesbania bispinosa root. Int J Phytoremediation 2016; 18:1061-6. [PMID: 27185302 DOI: 10.1080/15226514.2016.1183576] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
The cadmium (Cd) resistant bacteria were isolated from soils of Damanganga river, Vapi, and identified 11 potential Cd resistant bacteria based on 16S rDNA sequences. The Cd resistant bacteria belonged to four different genera: Providencia spp., Morganella sp., Stenotrophomonas sp., and Bacillus spp. The assessment of plant growth-promoting (PGP) parameters revealed that the Cd tolerant bacteria showed one or more PGP properties. Further, a pot experiment was conducted to elucidate the effects of Cd resistant bacteria on the plant growth and the uptake of Cd by Sesbania bispinosa. The bacterized seedlings recorded 36.0-74.8% and 21.2-32.9% higher root and shoot lengths, respectively, in Cd amended soil compared with control. The Cd mobilization in the root of S. bispinosa by microbial inoculants ranged from 0.02 ± 0.01 to 1.11 ± 0.06 ppm. The enhanced concentrations of Cd accumulation in S. bispinosa roots correspond to the effect of the bacterial strains on metal mobilization in soil. The present observations showed that the Cd resistant strains protect the plants against the inhibitory effects of Cd, probably due to the production of PGP properties. The present results provided a new insight into the phytoremediation of Cd contaminated soil.
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Affiliation(s)
- V P Kartik
- a C. G. Bhakta Institute of Biotechnology, Uka Tarsadia University , Bardoli , India
| | - H N Jinal
- a C. G. Bhakta Institute of Biotechnology, Uka Tarsadia University , Bardoli , India
| | - N Amaresan
- a C. G. Bhakta Institute of Biotechnology, Uka Tarsadia University , Bardoli , India
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27
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Tiwari S, Sarangi BK, Thul ST. Identification of arsenic resistant endophytic bacteria from Pteris vittata roots and characterization for arsenic remediation application. J Environ Manage 2016; 180:359-65. [PMID: 27257820 DOI: 10.1016/j.jenvman.2016.05.029] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2016] [Revised: 05/10/2016] [Accepted: 05/12/2016] [Indexed: 05/09/2023]
Abstract
Mitigation of arsenic (As) pollution is a topical environmental issue of high R&D priority. The present investigation was carried out to isolate As resistant endophytes from the roots of Indian ecotype Pteris vittata and characterize their As transformation and tolerance ability, plant growth promoting characteristics and their role to facilitate As uptake by the plant. A total of 8 root endophytes were isolated from plants grown in As amended soil (25 mg As kg(-1)). These isolates were studied for minimum inhibitory concentration (MIC), arsenite As(III) - arsenate As(V) transformation ability, plant growth promoting (PGP) characteristics through siderophore, indole acetic acid (IAA) production, phosphatase, ACC deaminase activity, and presence of arsenite oxidase (aox) and arsenite transporter (arsB) genes. On the basis of 16S rDNA sequence analysis, these isolates belong to Proteobacteria, Firmicutes and Bacteroidetes families under the genera Bacillus, Enterobacter, Stenotrophomonas and Rhizobium. All isolates were found As tolerant, of which one isolates showed highest tolerance up to 1000 mg L(-1) concentration in SLP medium. Five isolates were IAA positive with highest IAA production up to 60 mg/L and two isolates exhibited siderophore activity. Phosphatase activity was shown by only one isolate while ACC deaminase activity was absent in all the isolates. The As transformation study by silver nitrate test showed that only two strains had dual characteristics of As(III) oxidation and As (V) reduction, four strains exhibited either of the characteristics while other two didn't confirmed any of the two characteristics. Presence of aox gene was detected in two strains and arsB gene in six isolates. The strain with highest As tolerance also showed highest IAA production and occurrence of arsB gene. Present investigation may open up further scope of utilizing these endophytes for up gradation of phytoextraction process.
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Affiliation(s)
- Sarita Tiwari
- National Environmental Engineering Research Institute, Council of Scientific and Industrial Research, Nehru Marg, Nagpur 440020, India
| | - Bijaya Ketan Sarangi
- National Environmental Engineering Research Institute, Council of Scientific and Industrial Research, Nehru Marg, Nagpur 440020, India.
| | - Sanjog T Thul
- National Environmental Engineering Research Institute, Council of Scientific and Industrial Research, Nehru Marg, Nagpur 440020, India
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28
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Jayashree C, Tamilarasan K, Rajkumar M, Arulazhagan P, Yogalakshmi KN, Srikanth M, Banu JR. Treatment of seafood processing wastewater using upflow microbial fuel cell for power generation and identification of bacterial community in anodic biofilm. J Environ Manage 2016; 180:351-358. [PMID: 27254294 DOI: 10.1016/j.jenvman.2016.05.050] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Revised: 05/18/2016] [Accepted: 05/19/2016] [Indexed: 06/05/2023]
Abstract
Tubular upflow microbial fuel cell (MFC) utilizing sea food processing wastewater was evaluated for wastewater treatment efficiency and power generation. At an organic loading rate (OLR) of 0.6 g d(-1), the MFC accomplished total and soluble chemical oxygen demand (COD) removal of 83 and 95%, respectively. A maximum power density of 105 mW m(-2) (2.21 W m(-3)) was achieved at an OLR of 2.57 g d(-1). The predominant bacterial communities of anode biofilm were identified as RB1A (LC035455), RB1B (LC035456), RB1C (LC035457) and RB1E (LC035458). All the four strains belonged to genera Stenotrophomonas. The results of the study reaffirms that the seafood processing wastewater can be treated in an upflow MFC for simultaneous power generation and wastewater treatment.
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Affiliation(s)
- C Jayashree
- Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India
| | - K Tamilarasan
- Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India
| | - M Rajkumar
- Department of Life Sciences, Central University of Tamil Nadu, Thiruvarur, India
| | - P Arulazhagan
- Centre of Excellence in Environmental Studies, King Abdulaziz University, Jeddah, Saudi Arabia
| | - K N Yogalakshmi
- Centre for Environmental Science and Technology, School of Environment and Earth Sciences, Central University of Punjab, Bathinda, India
| | - M Srikanth
- Department of Biological Sciences, Birla Institute of Technology & Science, Pilani, KK Birla Goa Campus, NH 17 B, Zuarinagar, Goa, India
| | - J Rajesh Banu
- Department of Civil Engineering, Regional Centre of Anna University, Tirunelveli, India.
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29
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Tiwari B, Manickam N, Kumari S, Tiwari A. Biodegradation and dissolution of polyaromatic hydrocarbons by Stenotrophomonas sp. Bioresour Technol 2016; 216:1102-1105. [PMID: 27342606 DOI: 10.1016/j.biortech.2016.06.047] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 06/13/2016] [Accepted: 06/14/2016] [Indexed: 06/06/2023]
Abstract
The aim of this work was to study the biodegradation capabilities of a locally isolated bacterium, Stenotrophomonas sp. strain IITR87 to degrade the polycyclic aromatic hydrocarbons and also check the preferential biodegradation of polycyclic aromatic hydrocarbons (PAHs). From preferential substrate degradation studies, it was found that Stenotrophomonas sp. strain IITR87 first utilized phenanthrene (three membered ring), followed by pyrene (four membered ring), then benzo[α]pyrene (five membered ring). Dissolution study of PAHs with surfactants, rhamnolipid and tritonX-100 showed that the dissolution of PAHs increased in the presence of surfactants.
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Affiliation(s)
- Bhagyashree Tiwari
- Department of Molecular and Cellular Engineering, Jacob School of Biotechnology and Bioengineering, Sam Higginbottom Institute of Agriculture, Technology and Sciences, Allahabad 211 007, India; Environmental Biotechnology Section, CSIR-Indian Institute of Toxicology Research, Lucknow 226 001, India.
| | - N Manickam
- Environmental Biotechnology Section, CSIR-Indian Institute of Toxicology Research, Lucknow 226 001, India
| | - Smita Kumari
- Environmental Biotechnology Section, CSIR-Indian Institute of Toxicology Research, Lucknow 226 001, India
| | - Akhilesh Tiwari
- Department of Applied Sciences, Indian Institute of Information Technology, Allahabad, India
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30
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Budnik I, Zembrzuska J, Lukaszewski Z. Bacterial strains isolated from river water having the ability to split alcohol ethoxylates by central fission. Environ Sci Pollut Res Int 2016; 23:14231-14239. [PMID: 27053052 PMCID: PMC4943993 DOI: 10.1007/s11356-016-6566-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2015] [Accepted: 03/27/2016] [Indexed: 06/05/2023]
Abstract
Alcohol ethoxylates (AE) are a major component of the surfactant stream discharged into surface water. The "central fission" of AE with the formation of poly(ethylene glycols) (PEG) is considered to be the dominant biodegradation pathway. However, information as to which bacterial strains are able to perform this reaction is very limited. The aim of this work was to establish whether such an ability is unique or common, and which bacterial strains are able to split AE used as a sole source of organic carbon. Four bacterial strains were isolated from river water and were identified on the basis of phylogenetic trees as Enterobacter strain Z2, Enterobacter strain Z3, Citrobacter freundii strain Z4, and Stenotrophomonas strain Z5. Sterilized river water and "artificial sewage" were used for augmentation of the isolated bacteria. The test was performed in bottles filled with a mineral salt medium spiked with surfactant C12E10 (10 mg L(-1)) and an inoculating suspension of the investigated bacterial strain. Sequential extraction of the tested samples by ethyl acetate and chloroform was used for separation of PEG from the water matrix. LC-MS was used for PEG determination on the basis of single-ion chromatograms. All four selected and investigated bacterial strains exhibit the ability to split fatty alcohol ethoxylates with the production of PEG, which is evidence that this property is a common one rather than specific to certain bacterial strains. However, this ability increases in the sequence: Stenotrophomonas strain Z5 < Enterobacter strain Z2 < Enterobacter strain Z3 = Citrobacter freundii strain Z4. Graphical Abstract Biodegradation by central fission of alcohol ethoxylates by bacterial strains isolated from river water.
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Affiliation(s)
- Irena Budnik
- Institute of Chemistry and Technical Electrochemistry, Poznan University of Technology, pl. Sklodowskiej-Curie 5, 60-965, Poznan, Poland
| | - Joanna Zembrzuska
- Institute of Chemistry and Technical Electrochemistry, Poznan University of Technology, pl. Sklodowskiej-Curie 5, 60-965, Poznan, Poland.
- Faculty of Chemical Technology, Poznan University of Technology, ul. Berdychowo 4, 60-965, Poznan, Poland.
| | - Zenon Lukaszewski
- Institute of Chemistry and Technical Electrochemistry, Poznan University of Technology, pl. Sklodowskiej-Curie 5, 60-965, Poznan, Poland
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31
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Di Gregorio S, Siracusa G, Becarelli S, Mariotti L, Gentini A, Lorenzi R. Isolation and characterization of a hydrocarbonoclastic bacterial enrichment from total petroleum hydrocarbon contaminated sediments: potential candidates for bioaugmentation in bio-based processes. Environ Sci Pollut Res Int 2016; 23:10587-10594. [PMID: 26755178 DOI: 10.1007/s11356-015-5944-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Accepted: 12/07/2015] [Indexed: 06/05/2023]
Abstract
Seven hydrocarbonoclastic new bacterial isolates were isolated from dredged sediments of a river estuary in Italy. The sediments were contaminated by shipyard activities since decades, mainly ascribable to the exploitation of diesel oil as the fuel for recreational and commercial navigation of watercrafts. The bacterial isolates were able to utilize diesel oil as sole carbon source. Their metabolic capacities were evaluated by GC-MS analysis, with reference to the depletion of both the normal and branched alkanes, the nC18 fatty acid methyl ester and the unresolved complex mixture of organic compounds. They were taxonomically identified as different species of Stenotrophomonas and Pseudomonas spp. by the combination of amplified ribosomal DNA restriction analysis (ARDRA) and repetitive sequence-based PCR (REP-PCR) analysis. The metabolic activities of interest were analyzed both in relation to the single bacterial strains and to the combination of the latter as a multibacterial species system. After 6 days of incubation in mineral medium with diesel oil as sole carbon source, the Stenotrophomonas sp. M1 strain depleted 43-46 % of Cn-alkane from C28 up to C30, 70 % of the nC18 fatty acid methyl ester and the 46 % of the unresolved complex mixture of organic compounds. On the other hand, the Pseudomonas sp. NM1 strain depleted the 76 % of the nC18 fatty acid methyl ester, the 50 % of the unresolved complex mixture of organic compounds. The bacterial multispecies system was able to completely deplete Cn-alkane from C28 up to C30 and to deplete the 95 % of the unresolved complex mixture of organic compounds. The isolates, either as single strains and as a bacterial multispecies system, were proposed as candidates for bioaugmentation in bio-based processes for the decontamination of dredged sediments.
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Affiliation(s)
| | | | | | | | | | - Roberto Lorenzi
- Department of Biology, University of Pisa, 56126, Pisa, Italy
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Muratova A, Dubrovskaya E, Golubev S, Grinev V, Chernyshova M, Turkovskaya O. The coupling of the plant and microbial catabolisms of phenanthrene in the rhizosphere of Medicago sativa. J Plant Physiol 2015; 188:1-8. [PMID: 26398627 DOI: 10.1016/j.jplph.2015.07.014] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2015] [Revised: 07/13/2015] [Accepted: 07/14/2015] [Indexed: 06/05/2023]
Abstract
We studied the catabolism of the polycyclic aromatic hydrocarbon phenanthrene by four rhizobacterial strains and the possibility of enzymatic oxidation of this compound and its microbial metabolites by the root exudates of alfalfa (Medicago sativa L.) in order to detect the possible coupling of the plant and microbial metabolisms under the rhizospheric degradation of the organic pollutant. A comparative study of phenanthrene degradation pathways in the PAH-degrading rhizobacteria Ensifer meliloti, Pseudomonas kunmingensis, Rhizobium petrolearium, and Stenotrophomonas sp. allowed us to identify the key metabolites from the microbial transformation of phenanthrene, including 9,10-phenanthrenequinone, 2-carboxybenzaldehyde, and 1-hydroxy-2-naphthoic, salicylic, and o-phthalic acids. Sterile alfalfa plants were grown in the presence and absence of phenanthrene (0.03 g kg(-1)) in quartz sand under controlled environmental conditions to obtain plant root exudates. The root exudates were collected, concentrated by ultrafiltration, and the activity of oxidoreductases was detected spectrophotometrically by the oxidation rate for various substrates. The most marked activity was that of peroxidase, whereas the presence of oxidase and tyrosinase was detected on the verge of the assay sensitivity. Using alfalfa root exudates as a crude enzyme preparation, we found that in the presence of the synthetic mediator, the plant peroxidase could oxidize phenanthrene and its microbial metabolites. The results indicate the possibility of active participation of plants in the rhizospheric degradation of polycyclic aromatic hydrocarbons and their microbial metabolites, which makes it possible to speak about the coupling of the plant and microbial catabolisms of these contaminants in the rhizosphere.
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Affiliation(s)
- Anna Muratova
- Institute of Biochemistry and Physiology of Plants and Microorganisms, RAS, 13 Prospekt Entuziastov, 410049 Saratov, Russia.
| | - Ekaterina Dubrovskaya
- Institute of Biochemistry and Physiology of Plants and Microorganisms, RAS, 13 Prospekt Entuziastov, 410049 Saratov, Russia
| | - Sergey Golubev
- Institute of Biochemistry and Physiology of Plants and Microorganisms, RAS, 13 Prospekt Entuziastov, 410049 Saratov, Russia
| | - Vyacheslav Grinev
- Institute of Biochemistry and Physiology of Plants and Microorganisms, RAS, 13 Prospekt Entuziastov, 410049 Saratov, Russia
| | - Marina Chernyshova
- Institute of Biochemistry and Physiology of Plants and Microorganisms, RAS, 13 Prospekt Entuziastov, 410049 Saratov, Russia
| | - Olga Turkovskaya
- Institute of Biochemistry and Physiology of Plants and Microorganisms, RAS, 13 Prospekt Entuziastov, 410049 Saratov, Russia
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Ge S, Ge S, Zhou M, Dong X. Bioremediation of hexavalent chromate using permeabilized Brevibacterium sp. and Stenotrophomonas sp. cells. J Environ Manage 2015; 157:54-59. [PMID: 25881152 DOI: 10.1016/j.jenvman.2015.04.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2015] [Revised: 04/04/2015] [Accepted: 04/07/2015] [Indexed: 06/04/2023]
Abstract
Bioremediation has been found to be a useful method for removing hexavalent chromium (Cr(VI)), which is very toxic, from wastewater. Two strains of bacteria that were able to reduce Cr(VI) effectively were isolated from Cr(VI) contaminated soil samples and identified as Brevibacterium sp. K1 and Stenotrophomonas sp. D6, respectively, based on 16S rRNA gene sequence analyses. Brevibacterium sp. K1 and Stenotrophomonas sp. D6 could grow in Luria-Broth medium containing K2Cr2O7 at 1000 and 1600 mg/L, respectively, and they completely reduced the Cr(VI) in LB medium containing K2Cr2O7 at 200 mg/L within 72 h. Further analyses revealed that permeabilized K1 and D6 cells reduced Cr(VI) more effectively than did the resting cells. Triton X-100 was the best permeabilizing agent that was tested. The permeabilized cells of both strains could completely reduce Cr(VI) in industrial wastewater twice before needing to be replenished. The results suggested that these chromate-reducing bacteria are potential candidates for practical use biotreating industrial effluents containing Cr(VI) with Stenotrophomonas sp. D6 being the more effective bacterium.
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Affiliation(s)
- Shimei Ge
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou 325035, China.
| | - Shichao Ge
- Department of Research and Development, Shanghai Benegene Biotechnology Co., Ltd., Shanghai 201114, China
| | - Maohong Zhou
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou 325035, China
| | - Xinjiao Dong
- College of Life and Environmental Science, Wenzhou University, Wenzhou 325035, China; Key Laboratory for Subtropical Water Environment and Marine Biological Resources Protection, Wenzhou 325035, China
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Demakov VA, Vasil'ev DM, Maksimova YG, Pavlova YA, Ovechkina GV, Maksimov AY. [Activated Sludge Bacteria Transforming Cyanopyridines and Amides of Pyridinecarboxylic Acids]. Mikrobiologiia 2015; 84:369-378. [PMID: 26263697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Species diversity of bacteria from the activated sludge of Perm biological waste treatment facilities capable of transformation of cyanopyridines and amides of pyridinecarboxylic acids was investigated. Enrichment cultures in mineral media with 3-cyanopyridine as the sole carbon and nitrogen source were used to obtain 32 clones of gram-negative heterotrophic bacteria exhibiting moderate growth on solid and liquid media with 3- and 4-cyanopyridine. Sequencing of the 16S rRNA gene fragments revealed that the clones with homology of at least 99% belonged to the genera Acinetobacte, Alcaligenes, Delftia, Ochrobactrum, Pseudomonas, Stenotrophomonas, and Xanthobacter. PCR analysis showed that 13 out of 32 isolates contained the sequences (-1070 bp) homologous to the nitrilase genes reported previously in Alcaligenes faecalis JM3 (GenBank, D13419.1). Nine clones were capable of nitrile and amide transformation in minimal salt medium. Acinetobacter sp. 11 h and Alcaligenes sp. osv transformed 3-cyanopyridine to nicotinamide, while most of the clones possessed amidase activity (0.5 to 46.3 mmol/(g h) for acetamide and 0.1 to 5.6 mmol/(g h) for nicotinamide). Nicotinamide utilization by strain A. faecalis 2 was shown to result in excretion of a secondary metabolite, which was identified as dodecyl acrylate at 91% probability.
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Jauhari N, Mishra S, Kumari B, Singh SN. Bacteria-mediated aerobic degradation of hexacosane in vitro conditions. Bioresour Technol 2014; 170:62-68. [PMID: 25125193 DOI: 10.1016/j.biortech.2014.07.091] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Revised: 07/21/2014] [Accepted: 07/23/2014] [Indexed: 06/03/2023]
Abstract
In vitro degradation of hexacosane (C26H54), a HMW n-alkane, was studied in MSM by two bacterial strains i.e., Pseudomonas sp. BP10 and Stenotrophomonas nitritireducens E9, isolated from petroleum sludge, in isolation and combination. The results revealed that both the strains were able to metabolize hexacosane by 82% in isolation and 98% in their consortium after 7days. An enhancement of 16% in hexacosane degradation by the consortium indicated an additive action of bacterial strains. However, in control, a degradation of 21% was attributed to abiotic factors. During incubation with hexacosane, both the bacteria continued to multiply in isolation and consortium, which reflected that hexacosane was utilized by bacteria as a carbon and energy source. Activities of alkane hydroxylase and alcohol dehydrogenase were differentially expressed in isolation and combination, indicating their involvement in hexacosane degradation. Enhanced cell surface hydrophobicity and emulsification index and reduced surface tension also supported the degradation process.
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Affiliation(s)
- Nitanshi Jauhari
- Plant Ecology & Environmental Science Division, CSIR-National Botanical Research Institute, Lucknow, Uttar Pradesh, India
| | - Shweta Mishra
- Plant Ecology & Environmental Science Division, CSIR-National Botanical Research Institute, Lucknow, Uttar Pradesh, India
| | - Babita Kumari
- Plant Ecology & Environmental Science Division, CSIR-National Botanical Research Institute, Lucknow, Uttar Pradesh, India
| | - S N Singh
- Plant Ecology & Environmental Science Division, CSIR-National Botanical Research Institute, Lucknow, Uttar Pradesh, India.
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Jo YS, An JU, Oh DK. γ-Dodecelactone production from safflower oil via 10-hydroxy-12(Z)-octadecenoic acid intermediate by whole cells of Candida boidinii and Stenotrophomonas nitritireducens. J Agric Food Chem 2014; 62:6736-6745. [PMID: 24967938 DOI: 10.1021/jf501081z] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Candida boidinii was selected as a γ-dodecelactone producer because of the highest production of γ-dodecelactone from 10-hydroxy-12(Z)-octadecenoic acid among the 11 yeast strains tested. Under the reaction conditions of pH 5.5 and 25 °C with 5 g/L 10-hydroxy-12(Z)-octadecenoic acid and 30 g/L cells, whole C. boidinii cells produced 2.1 g/L γ-dodecelactone from 5 g/L 10-hydroxy-12(Z)-octadecenoic acid after 6 h, with a conversion yield of 64% (mol/mol) and a volumetric productivity of 350 mg/L/h. The production of γ-dodecelactone from safflower oil was performed by lipase hydrolysis reaction and two-step whole-cell biotransformation using Stenotrophomonas nitritireducens and C. boidinii. γ-Dodecelactone at 1.88 g/L was produced from 7.5 g/L safflower oil via 5 g/L 10-hydroxy-12(Z)-octadecenoic acid intermediate by these reactions after 8 h of reaction time, with a volumetric productivity of 235 mg/L/h and a conversion yield of 25% (w/w). To the best of the authors' knowledge, this is the highest volumetric productivity and conversion yield reported to date for the production of γ-lactone from natural oils.
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Affiliation(s)
- Ye-Seul Jo
- Department of Bioscience and Biotechnology, Konkuk University , Seoul 143-701, Republic of Korea
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Yang F, Zhou Y, Yin L, Zhu G, Liang G, Pu Y. Microcystin-degrading activity of an indigenous bacterial strain Stenotrophomonas acidaminiphila MC-LTH2 isolated from Lake Taihu. PLoS One 2014; 9:e86216. [PMID: 24416455 PMCID: PMC3887098 DOI: 10.1371/journal.pone.0086216] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Accepted: 12/10/2013] [Indexed: 11/30/2022] Open
Abstract
Microcystin-LR (MC-LR) and microcystin-RR (MC-RR) produced by harmful cyanobacterial blooms (HCBs) pose substantial threats to the ecosystem and public health due to their potential hepatotoxicity. Degradation of microcystins (MCs) by indigenous bacteria represents a promising method for removing MCs from fresh water without harming the aquatic environment, but only a few microcystin (MC)-degrading bacteria have been isolated and had their mechanisms reported. This study aimed to isolate indigenous bacteria from Lake Taihu, and investigate the capability and mechanism of MC degradation by these bacteria. During a Microcystis bloom, an indigenous MC-degrading bacterium designated MC-LTH2 was successfully isolated from Lake Taihu, and identified as Stenotrophomonas acidaminiphila based on phylogenetic analysis. In the presence of MC-LR together with MC-RR, the strain MC-LTH2 was capable of totally degrading both simultaneously in 8 days, at rates of 3.0 mg/(L⋅d) and 5.6 mg/(L⋅d), respectively. The degradation rates of MCs were dependent on temperature, pH, and initial MC concentration. Adda (3-amino-9-methoxy-2, 6, 8-trimethyl-10-phenyldeca-4, 6-dienoic acid) was detected as an intermediate degradation product of MCs using high performance liquid chromatography coupled with time-of-flight mass spectrometry (HPLC-TOF-MS). To the best of our knowledge, this is the first report of Stenotrophomonas acidaminiphila capable of degrading two MC analogues and other compounds containing Adda residue completely under various conditions, although the mlrA gene in the strain was not detected. These results indicate the Stenotrophomonas acidaminiphila strain MC-LTH2 possesses a significant potential to be used in bioremediation of water bodies contaminated by MC-LR and MC-RR, and is potentially involved in the degradation of MCs during the disappearance of the HCBs in Lake Taihu.
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Affiliation(s)
- Fei Yang
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China
| | - Yuanlong Zhou
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China
| | - Lihong Yin
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China
| | - Guangcan Zhu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China
| | - Geyu Liang
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China
| | - Yuepu Pu
- Key Laboratory of Environmental Medicine Engineering, Ministry of Education, School of Public Health, Southeast University, Nanjing, China
- * E-mail:
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Gunasundari D, Muthukumar K. Simultaneous Cr(VI) reduction and phenol degradation using Stenotrophomonas sp. isolated from tannery effluent contaminated soil. Environ Sci Pollut Res Int 2013; 20:6563-6573. [PMID: 23608988 DOI: 10.1007/s11356-013-1718-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2013] [Accepted: 04/03/2013] [Indexed: 06/02/2023]
Abstract
This study presents simultaneous hexavalent chromium (Cr(VI)) reduction and phenol degradation using Stenotrophomonas sp., isolated from tannery effluent contaminated soil. Phenol was used as the sole carbon and energy source for Cr(VI) reduction. The optimization of different operating parameters was done using Placket-Burman design (PBD) and Box-Behnken design (BBD). The significant operating variables identified by PBD were initial Cr(VI) and phenol concentration, pH, temperature, and reaction time. These variables were optimized by a three-level BBD and the optimum initial Cr(VI) concentration, initial phenol concentration, pH, temperature, and reaction time obtained were 16.59 mg/l, 200.05 mg/l, 7.38, 31.96 °C and 4.07 days, respectively. Under the optimum conditions, 81.27 % Cr(VI) reduction and 100 % phenol degradation were observed experimentally. The results concluded that the Stenotrophomonas sp. could be used to decontaminate the effluents containing Cr(VI) and phenol effectively.
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Affiliation(s)
- Dharmaraj Gunasundari
- Department of Chemical Engineering, Alagappa College of Technology Campus, Anna University Chennai, Chennai, 600 025, India
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Malhotra A, Dolma K, Kaur N, Rathore YS, Mayilraj S, Choudhury AR. Biosynthesis of gold and silver nanoparticles using a novel marine strain of Stenotrophomonas. Bioresour Technol 2013; 142:727-731. [PMID: 23791020 DOI: 10.1016/j.biortech.2013.05.109] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2013] [Revised: 05/23/2013] [Accepted: 05/25/2013] [Indexed: 06/02/2023]
Abstract
The present study aims at exploiting marine microbial diversity for biosynthesis of metal nanoparticles and also investigates role of microbial proteins in the process of bio-mineralization of gold and silver. This is the first report for concurrent production of gold and silver nanoparticles (AuNPs and AgNPs) by extracellular secretion of a novel strain of Stenotrophomonas, isolated from Indian marine origin. This novel strain has faster rate kinetics for AgNPs synthesis than any other organism reported earlier. The nanoparticles were further characterized using UV-vis spectrophotometer, TEM, DLS and EDAX confirming their size ranging from 10-50 nm and 40-60 nm in dimensions for AuNPs and AgNPs, respectively. TEM analysis indicated formation of multi-shaped nanoparticles with heterogeneous size distribution in both the cases. Finally, the SDS-PAGE analysis of extracellular media supernatant suggested a potential involvement of certain low molecular weight secretory proteins in AuNPs and AgNPs biosynthesis.
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Affiliation(s)
- Ankit Malhotra
- CSIR-Institute of Microbial Technology (IMTECH), Council of Scientific and Industrial Research (CSIR), Sector 39A, Chandigarh 160 036, India
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Ni X, Liu J, Gao YZ, Zhu XZ, Sun K. [Isolation of two endophytic phenanthrene-degrading strains and their degradation capacity]. Huan Jing Ke Xue 2013; 34:746-752. [PMID: 23668150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Two endophytic bacterial strains, which could degrade high concentration (up to 200 mg.L-1) of phenanthrene in liquid, were isolated from plants grown in PAHs-contaminated soils by the selective. enrichment culture. According to the results of morphology, physiology and the phylogenetic analyses of 16S rDNA sequence, stain P1 was identified as Stenotrophomonas sp. , and strain P3 was identified as Pseudomonas sp.. Two strains were aerobic bacteria, the degradation rates of phenanthrene (100 mg.L-1) by strain P1 and strain P3 were all greater than 90% at 28 degrees C on the rotation shaker at 150 r.min-1 for 7 days. The degradation rates of phenanthrene by two strains were greater than 70% when cultivated under the conditions as: 20-30 degrees C , pH 6-8, 0%-4% NaCl, 10-30 mL/100 mL inventory. It suggested that the optimum culture condition was: 30 degrees C, pH 7.0, NaCl< or =4% , inventory < or = 30 mL/100 mL flask. Through comprehensive comparison analyses on the degradation capacity of two strains, it showed that the tolerance of strain P1 to high temperature was higher than that of str ain P3, while the tolerance of strain P3 to pH change and anoxic condition was higher than that of strain P1.
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Affiliation(s)
- Xue Ni
- College of Resource and Environmental Science, Institute of Organic Contaminant Control and Soil Remediation, Nanjing Agricultural University, Nanjing 210095, China.
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Subashchandrabose SR, Megharaj M, Venkateswarlu K, Lockington R, Naidu R. Influence of nutrient mixtures on p-nitrophenol degradation by Stenotrophomonas sp. isolated from groundwater. J Environ Sci Health A Tox Hazard Subst Environ Eng 2013; 48:108-119. [PMID: 23030394 DOI: 10.1080/10934529.2012.707861] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
We isolated strain CERAR5, a Stenotrophomonas sp., from an aquifer contaminated with chlorinated hydrocarbons that utilizes up to 1.0 mM PNP within 62 h in M9 medium as a source of carbon and nitrogen. To assess the potential of this strain for use in bioremediation, we investigated the influence of external sources of carbon and nitrogen on bacterial degradation of PNP following a full factorial design analysis. Glucose, sodium acetate, phenol, sodium nitrate and ammonium chloride were the factors chosen, while per cent removal of PNP, growth of the bacterial strain, and change in pH of the medium were the responses measured. Glucose and acetate had significant positive influence on the removal PNP. In particular, acetate exhibited a significant positive effect on all the three responses measured, clearly suggesting that the addition of acetate greatly contributes to an efficient bioremediation of habitats contaminated with PNP by Stenotrophomonas sp. CERAR5.
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Affiliation(s)
- Suresh R Subashchandrabose
- Centre for Environmental Risk Assessment and Remediation , University of South Australia, Mawson Lakes Campus, Mawson Lakes, Australia
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Yu FB, Shinawar WA, Sun JY, Luo LP. Isolation and characterization of an endosulfan-degrading strain, Stenotrophomonas sp. LD-6, and its potential in soil bioremediation. Pol J Microbiol 2012; 61:257-262. [PMID: 23484408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023] Open
Abstract
Aerobic bacteria degrading endosulfan were isolated from contaminated sludge. One of the isolates, LD-6, was identified as Stenotrophomonas sp. The bacterium could utilize endosulfan as the sole source of carbon and sulfur. 100 mg/l endosulfan was completely degraded within 10 days, and endosulfan diol and endosulfan ether were detected as major metabolites with a slight decrease in culture pH. The results indicated that Stenotrophomonas. sp. LD-6 might degrade endosulfan by a non-oxidative pathway. Biodegradation of both isomers was relatively better at a temperature range of 25-35 degrees C, with a maximum at 30 degrees C. In addition, cell crude extract of strain LD-6 could metabolize endosulfan rapidly, and degradative enzymes were intracellular distributed and constitutively expressed. Besides, application of the strain was found to promote the removal of endosulfan in soil. This study might help with the future research in better understanding of the biodegradation.
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Affiliation(s)
- Fang-Bo Yu
- Department of Environmental Sciences, College of Environment and Resource Sciences, Zhejiang Agricultural and Forestry University, Linan, China
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Abstract
Three bacterial strains, Arthrobacter sp. NB1, Serratia sp. NB2 and Stenotrophomonas sp. NB3, were isolated from contaminated sludge by using nitrobenzene as a sole source of carbon and nitrogen. It was observed that all three strains could degrade nitrobenzene at 400 mg/L initial concentration and mixed-cultivation of these strains could enhance the degradation of nitrobenzene compared with mono-cultivation. Mixture design was used for adjusting the proportions of each strain and the optimal ratio of inoculation size was NB1:NB2:NB3 = 4:4:5, where the nitrobenzene degradation percentage was two times higher than for by the single strain. The results of Plackett-Burman design indicated that Mg(2+), Ca(2+), Fe(2+), Zn(2+) and Mn(2+) had a positive effect on the degradation of nitrobenzene, while Cu(2+) and Co(2+) had a negative effect on it.
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Affiliation(s)
- D F Jin
- College of Life Sciences, Zhejiang University, Hangzhou, China
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Cerqueira VS, Hollenbach EB, Maboni F, Vainstein MH, Camargo FAO, do Carmo R Peralba M, Bento FM. Biodegradation potential of oily sludge by pure and mixed bacterial cultures. Bioresour Technol 2011; 102:11003-11010. [PMID: 21993328 DOI: 10.1016/j.biortech.2011.09.074] [Citation(s) in RCA: 116] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/15/2011] [Revised: 09/17/2011] [Accepted: 09/18/2011] [Indexed: 05/31/2023]
Abstract
The biodegradation capacity of aliphatic and aromatic hydrocarbons of petrochemical oily sludge in liquid medium by a bacterial consortium and five pure bacterial cultures was analyzed. Three bacteria isolated from petrochemical oily sludge, identified as Stenotrophomonas acidaminiphila, Bacillus megaterium and Bacillus cibi, and two bacteria isolated from a soil contaminated by petrochemical waste, identified as Pseudomonas aeruginosa and Bacillus cereus demonstrated efficiency in oily sludge degradation when cultivated during 40 days. The bacterial consortium demonstrated an excellent oily sludge degradation capacity, reducing 90.7% of the aliphatic fraction and 51.8% of the aromatic fraction, as well as biosurfactant production capacity, achieving 39.4% reduction of surface tension of the culture medium and an emulsifying activity of 55.1%. The results indicated that the bacterial consortium has potential to be applied in bioremediation of petrochemical oily sludge contaminated environments, favoring the reduction of environmental passives and increasing industrial productivity.
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Affiliation(s)
- Vanessa S Cerqueira
- Department of Microbiology, Federal University of Rio Grande do Sul, Sarmento Leite, 500, CEP 90050-170, Porto Alegre, RS, Brazil.
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Ghosh P, Rathinasabapathi B, Ma LQ. Arsenic-resistant bacteria solubilized arsenic in the growth media and increased growth of arsenic hyperaccumulator Pteris vittata L. Bioresour Technol 2011; 102:8756-8761. [PMID: 21840210 DOI: 10.1016/j.biortech.2011.07.064] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Revised: 07/14/2011] [Accepted: 07/19/2011] [Indexed: 05/31/2023]
Abstract
The role of arsenic-resistant bacteria (ARB) in arsenic solubilization from growth media and growth enhancement of arsenic-hyperaccumulator Pteris vittata L. was examined. Seven ARB (tolerant to 10 mM arsenate) were isolated from the P. vittata rhizosphere and identified by 16S rRNA sequencing as Pseudomonas sp., Comamonas sp. and Stenotrophomonas sp. During 7-d hydroponic experiments, these bacteria effectively solubilized arsenic from the growth media spiked with insoluble FeAsO₄ and AlAsO₄ minerals (from < 5 μg L⁻¹ to 5.04-7.37 mg L⁻¹ As) and enhanced plant arsenic uptake (from 18.1-21.9 to 35.3-236 mg kg⁻¹ As in the fronds). Production of (1) pyochelin-type siderophores by ARB (fluorescent under ultraviolet illumination and characterized with thin layer chromatography) and (2) root exudate (dissolved organic C) by P. vittata may be responsible for As solubilization. Increase in P. vittata root biomass from 1.5-2.2 to 3.4-4.2 g/plant dw by ARB and by arsenic was associated with arsenic-induced plant P uptake. Arsenic resistant bacteria may have potential to enhance phytoremediation of arsenic-contaminated soils by P. vittata.
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Affiliation(s)
- Piyasa Ghosh
- Soil and Water Science Department, University of Florida, Gainesville, FL 32611, USA
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Li X, Fu S, Yu J, Fu K, Chen Y, Zhang R, Liu Y. [Isolation and identification of a polyhydroxyalkanoate producing strain]. Wei Sheng Wu Xue Bao 2010; 50:1488-1493. [PMID: 21268894] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
OBJECTIVE We screened and isolated polyhydroxyalkanoate producing bacteria. METHODS The strains were isolated from sludge from a beer brewery and screened by Sudan black B staining method. The isolated strains were identified according to their morphological features, physiological and biochemical analysis as well as 16S rRNA gene sequence analysis. The product extracted with hot chloroform from the isolated strain HG-B-1 was confirmed by Fourier transform infrared spectra. RESULTS We isolated a bacterium, HG-B-1, from sludge collected from a beer brewery in Guangdong province, China. The yield of polyhydroxyalkanoates was 23.4% (w/w) based on dried weight of the bacterium cells when HG-B-1 grew in a medium containing saccharose. We analyzed 16S rRNA nucleotide sequence, and ascertained the phylogenetic position of the strain. CONCLUSION Strain HG-B-1 with PHAs biosynthesis ability was identified as Stenotrophomonas maltophlia.
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Affiliation(s)
- Xueyun Li
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
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Yang C, Song C, Mulchandani A, Qiao C. Genetic engineering of Stenotrophomonas strain YC-1 to possess a broader substrate range for organophosphates. J Agric Food Chem 2010; 58:6762-6766. [PMID: 20455565 DOI: 10.1021/jf101105s] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
In this work, Stenotrophomonas sp. strain YC-1, a native soil bacterium that produces methyl parathion hydrolase (MPH), was genetically engineered to possess a broader substrate range for organophosphates (OPs). A surface anchor system derived from the truncated ice nucleation protein (INPNC) from Pseudomonas syringae was used to target organophosphorus hydrolase (OPH) onto the cell surface of strain YC-1, reducing the potential substrate uptake limitation. The surface localization of INPNC-OPH was verified by cell fractionation, Western blot, proteinase accessibility, and immunofluorescence microscopy. No growth inhibition was observed for the engineered strain, and suspended cultures retained almost 100% activity over a period of 2 weeks. Concomitant expression of OPH in strain YC-1 resulted in a recombinant strain capable of simultaneously degrading diethyl and dimethyl OPs. A mixture of six OP pesticides (0.2 mM each) could be degraded completely within 5 h. The broader substrate specificity in combination with the rapid degradation rate makes this engineered strain a promising candidate for in situ remediation of OP-contaminated sites.
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Affiliation(s)
- Chao Yang
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China
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Zhong M, Zhang JQ, Wu XX, Yang F, Ma H, Chen LJ. [Isolation, identification, and degrading characteristics of a high-efficient pyrene-degrading bacterial strain]. Ying Yong Sheng Tai Xue Bao 2010; 21:1334-1338. [PMID: 20707122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
By using selective enrichment culture with pyrene as the sole carbon source, a pyrene-degrading bacterial strain ZQ5 was isolated from the oil-contaminated soil in Shenfu Irrigation Area. The strain was identified as Stenotrophomonas sp., based on its morphological, physiological, and biochemical characteristics, and similarity identification of 16S rDNA sequence. The pyrene-degrading characteristics and the effects of culture condition on the degrading efficiency of the strain were investigated by shaking flask culture. After shaking culture with the initial concentration of pyrene being 100 mg x L(-1) at 30 degrees C for 10 days, the degradation rate of pyrene was 91.2%. Adding 100 mg x L(-1) of alicylic acid into culture medium could enhance the degrading efficiency of the strain. For the degradation of pyrene by ZQ5, the optimal medium pH was 7-8, and the optimal salt concentration was lower than 2%.
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Affiliation(s)
- Ming Zhong
- Liaoning Province Key Laboratory of Agricultural Biotechnology, Shenyang Agricultural University, Shenyang 110161, China.
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Chen J, Hu LB, Zhou W, Yan SH, Yang JD, Xue YF, Shi ZQ. Degradation of microcystin-LR and RR by a Stenotrophomonas sp. strain EMS isolated from Lake Taihu, China. Int J Mol Sci 2010; 11:896-911. [PMID: 20479990 PMCID: PMC2869242 DOI: 10.3390/ijms11030896] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2010] [Revised: 01/20/2010] [Accepted: 02/02/2010] [Indexed: 11/16/2022] Open
Abstract
A bacterial strain EMS with the capability of degrading microcystins (MCs) was isolated from Lake Taihu, China. The bacterium was tentatively identified as a Stenotrophomonas sp. The bacterium could completely consume MC-LR and MC-RR within 24 hours at a concentration of 0.7 μg/mL and 1.7 μg/mL, respectively. The degradation of MC-LR and MC-RR by EMS occurred preferentially in an alkaline environment. In addition, mlrA gene involved in the degradation of MC-LR and MC-RR was detected in EMS. Due to the limited literature this gene has rare homologues. Sequencing analysis of the translated protein from mlrA suggested that MlrA might be a transmembrane protein, which suggests a possible new protease family having unique function.
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Affiliation(s)
- Jian Chen
- Institute of Food Safety and Quality, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China; E-Mails:
(J.C.);
(W.Z.);
(J.D.Y.);
(Y.F.X.)
- Key Laboratory of Food Safety Monitoring and Management, Ministry of Agriculture, 50 Zhongling Street, Nanjing 210014, China; E-Mail:
(S.H.Y.)
| | - Liang Bin Hu
- School of Food, Henan Institute of Science and Technology, Xinxiang 453003, China; E-Mail:
(L.B.H.)
| | - Wei Zhou
- Institute of Food Safety and Quality, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China; E-Mails:
(J.C.);
(W.Z.);
(J.D.Y.);
(Y.F.X.)
- Key Laboratory of Food Safety Monitoring and Management, Ministry of Agriculture, 50 Zhongling Street, Nanjing 210014, China; E-Mail:
(S.H.Y.)
| | - Shao Hua Yan
- Key Laboratory of Food Safety Monitoring and Management, Ministry of Agriculture, 50 Zhongling Street, Nanjing 210014, China; E-Mail:
(S.H.Y.)
- Institute of Resources and Environmental Sciences, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China
| | - Jing Dong Yang
- Institute of Food Safety and Quality, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China; E-Mails:
(J.C.);
(W.Z.);
(J.D.Y.);
(Y.F.X.)
- Key Laboratory of Food Safety Monitoring and Management, Ministry of Agriculture, 50 Zhongling Street, Nanjing 210014, China; E-Mail:
(S.H.Y.)
| | - Yan Feng Xue
- Institute of Food Safety and Quality, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China; E-Mails:
(J.C.);
(W.Z.);
(J.D.Y.);
(Y.F.X.)
- Key Laboratory of Food Safety Monitoring and Management, Ministry of Agriculture, 50 Zhongling Street, Nanjing 210014, China; E-Mail:
(S.H.Y.)
| | - Zhi Qi Shi
- Institute of Food Safety and Quality, Jiangsu Academy of Agricultural Sciences, 50 Zhongling Street, Nanjing 210014, China; E-Mails:
(J.C.);
(W.Z.);
(J.D.Y.);
(Y.F.X.)
- Key Laboratory of Food Safety Monitoring and Management, Ministry of Agriculture, 50 Zhongling Street, Nanjing 210014, China; E-Mail:
(S.H.Y.)
- Author to whom correspondence should be addressed; E-Mail:
; Tel.: +86-25-8439-1863; Fax: +86-25-8439-0422
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Zhang H, Yang C, Zhao Q, Qiao C. Development of an autofluorescent organophosphates-degrading Stenotrophomonas sp. with dehalogenase activity for the biodegradation of hexachlorocyclohexane (HCH). Bioresour Technol 2009; 100:3199-3204. [PMID: 19269809 DOI: 10.1016/j.biortech.2009.02.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2008] [Revised: 02/04/2009] [Accepted: 02/04/2009] [Indexed: 05/27/2023]
Abstract
Simultaneous biodegradation of hexachlorocyclohexane (HCH) and organophosphates (OPs) by a recombinant Stenotrophomonas sp. was studied in the study. The broad-host-range plasmid pVGAB, harboring enhanced green fluorescent protein gene (egfp) and dehalogenase genes (linA and linB), was constructed and transformed into the OP-degrading strain Stenotrophomonas YC-1 to get the recombinant strain YC-H. Over-expression of dehalogenase (LinA and LinB) and enhanced green fluorescent protein (EGFP) was obtained in YC-H by determining their enzymatic activities and fluorescence intensity. YC-H was capable of rapidly and simultaneously degrading 10mg/l gamma-HCH and 100mg/l methyl parathion (MP) determined by GC-ECD analysis. A bioremediation assay with YC-H inoculated into fumigated and nonfumigated soil showed that both 10mg/kg gamma-HCH and 100mg/kg MP could be completely degraded within 32 days. The novel EGFP-marked bacterium could be potentially applied in the field-scale decontamination of HCH and OPs residues in the environment.
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Affiliation(s)
- Heng Zhang
- State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, China
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