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Zhao Y, Sun T, Li Y, Yang Z, Chen J, Wang J, Yu X, Tang X, Xiao H. The host sex contributes to the endophytic bacterial community in Sargassum thunbergii and their receptacles. Front Microbiol 2024; 15:1334918. [PMID: 38559345 PMCID: PMC10978810 DOI: 10.3389/fmicb.2024.1334918] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Accepted: 02/14/2024] [Indexed: 04/04/2024] Open
Abstract
Endophytic bacteria have a complex coevolutionary relationship with their host macroalgae. Dioecious macroalgae are important producers in marine ecosystems, but there is still a lack of research on how sex influences their endophytic bacteria. In this study, the endophytic bacterial communities in male and female S. thunbergii and their reproductive tissues (receptacles) were compared using culture methods and high-throughput sequencing. The endophytic bacterial communities detected by the two methods were different. Among the 78 isolated strains, the dominant phylum, genus, and species were Bacillota, Alkalihalobacillus, and Alkalihalobacillus algicola, respectively, in the algal bodies, while in the receptacles, they were Bacillota, Vibrio, and Vibrio alginolyticus. However, 24 phyla and 349 genera of endophytic bacteria were identified by high-throughput sequencing, and the dominant phylum and genus were Pseudomonadota and Sva0996_ Marine_ Group, respectively, in both the algal body and the receptacles. The two methods showed similar compositions of endophytic bacterial communities between the samples of different sexes, but the relative abundances of dominant and specific taxa were different. The high-throughput sequencing results showed more clearly that the sex of the host alga had an effect on its endophyte community assembly and a greater effect on the endophytic bacterial community in the receptacles. Moreover, most specific bacteria and predicted functional genes that differed between the samples from the males and females were related to metabolism, suggesting that metabolic differences are the main causes of sex differences in the endophytic bacterial community. Our research is the first to show that host sex contributes to the composition of endophytic bacterial communities in dioecious marine macroalgae. The results enrich the database of endophytic bacteria of dioecious marine macroalgae and pave the way for better understanding the assembly mechanism of the endophytic bacterial community of algae.
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Affiliation(s)
- Yayun Zhao
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
- Laboratory for Marine Ecology and Environmental Science, Qingdao Marine Science and Technology Center, Qingdao, China
| | - Tao Sun
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
- Qingdao Branch CCCC Water Transportation Consultants Co.,LTD, Qingdao, China
| | - Yang Li
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
- Shandong Marine Forecast and Hazard Mitigation Service, Qingdao, China
| | - Zhibo Yang
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Jun Chen
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Jing Wang
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Xinlong Yu
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Xuexi Tang
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
- Laboratory for Marine Ecology and Environmental Science, Qingdao Marine Science and Technology Center, Qingdao, China
| | - Hui Xiao
- College of Marine Life Sciences, Ocean University of China, Qingdao, China
- Laboratory for Marine Ecology and Environmental Science, Qingdao Marine Science and Technology Center, Qingdao, China
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Li CY, Cao HY, Wang Q, Carrión O, Zhu X, Miao J, Wang P, Chen XL, Todd JD, Zhang YZ. Aerobic methylation of hydrogen sulfide to dimethylsulfide in diverse microorganisms and environments. THE ISME JOURNAL 2023; 17:1184-1193. [PMID: 37179443 PMCID: PMC10356932 DOI: 10.1038/s41396-023-01430-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2023] [Revised: 04/27/2023] [Accepted: 05/02/2023] [Indexed: 05/15/2023]
Abstract
Dimethylsulfide (DMS) is the major biosulfur source emitted to the atmosphere with key roles in global sulfur cycling and potentially climate regulation. The main precursor of DMS is thought to be dimethylsulfoniopropionate. However, hydrogen sulfide (H2S), a widely distributed and abundant volatile in natural environments, can be methylated to DMS. The microorganisms and the enzymes that convert H2S to DMS, and their importance in global sulfur cycling were unknown. Here we demonstrate that the bacterial MddA enzyme, previously known as a methanethiol S-methyltransferase, could methylate inorganic H2S to DMS. We determine key residues involved in MddA catalysis and propose the mechanism for H2S S-methylation. These results enabled subsequent identification of functional MddA enzymes in abundant haloarchaea and a diverse range of algae, thus expanding the significance of MddA mediated H2S methylation to other domains of life. Furthermore, we provide evidence for H2S S-methylation being a detoxification strategy in microorganisms. The mddA gene was abundant in diverse environments including marine sediments, lake sediments, hydrothermal vents and soils. Thus, the significance of MddA-driven methylation of inorganic H2S to global DMS production and sulfur cycling has likely been considerably underestimated.
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Affiliation(s)
- Chun-Yang Li
- MOE Key Laboratory of Evolution and Marine Biodiversity, Frontiers Science Center for Deep Ocean Multispheres and Earth System & College of Marine Life Sciences, Ocean University of China, Qingdao, China
| | - Hai-Yan Cao
- MOE Key Laboratory of Evolution and Marine Biodiversity, Frontiers Science Center for Deep Ocean Multispheres and Earth System & College of Marine Life Sciences, Ocean University of China, Qingdao, China.
- State Key Laboratory of Microbial Technology, Marine Biotechnology Research Center, Shandong University, Qingdao, China.
- Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China.
| | - Qing Wang
- State Key Laboratory of Microbial Technology, Marine Biotechnology Research Center, Shandong University, Qingdao, China
| | - Ornella Carrión
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, UK
| | - Xiaoyu Zhu
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, UK
| | - Jie Miao
- State Key Laboratory of Microbial Technology, Marine Biotechnology Research Center, Shandong University, Qingdao, China
| | - Peng Wang
- MOE Key Laboratory of Evolution and Marine Biodiversity, Frontiers Science Center for Deep Ocean Multispheres and Earth System & College of Marine Life Sciences, Ocean University of China, Qingdao, China
- Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China
| | - Xiu-Lan Chen
- State Key Laboratory of Microbial Technology, Marine Biotechnology Research Center, Shandong University, Qingdao, China
- Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China
| | - Jonathan D Todd
- School of Biological Sciences, University of East Anglia, Norwich Research Park, Norwich, UK
| | - Yu-Zhong Zhang
- MOE Key Laboratory of Evolution and Marine Biodiversity, Frontiers Science Center for Deep Ocean Multispheres and Earth System & College of Marine Life Sciences, Ocean University of China, Qingdao, China.
- State Key Laboratory of Microbial Technology, Marine Biotechnology Research Center, Shandong University, Qingdao, China.
- Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology, Qingdao, China.
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Bu H, Carvalho G, Yuan Z, Bond P, Jiang G. Biotrickling filter for the removal of volatile sulfur compounds from sewers: A review. CHEMOSPHERE 2021; 277:130333. [PMID: 33780683 DOI: 10.1016/j.chemosphere.2021.130333] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 03/14/2021] [Accepted: 03/15/2021] [Indexed: 06/12/2023]
Abstract
Volatile sulfur compounds (VSCs) were identified as the dominant priority odorants emitted from sewers, including hydrogen sulfide (H2S), methyl mercaptan (MM), dimethyl disulfide (DMDS) and dimethyl sulfide (DMS). Biotrickling filter (BTF) is a widely-applied technology for odour abatement in sewers because of its relatively low operating cost and efficient H2S removal. The authors review the mechanisms and performance of BTF for the removal of these four VSCs, and discuss the key influencing factors including of empty bed residence time (EBRT), pH, temperature, nutrients, water content, trickling operation and packing materials. Besides, measures to improve the VSCs removal in BTF are proposed in the context of key influencing factors. Finally, the review assesses the new challenges of BTF for sewer emissions treatment, namely with respect to the performance of BTF for greenhouse gases (GHG) treatment.
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Affiliation(s)
- Hao Bu
- Advanced Water Management Centre, The University of Queensland, QLD, Australia
| | - Gilda Carvalho
- Advanced Water Management Centre, The University of Queensland, QLD, Australia
| | - Zhiguo Yuan
- Advanced Water Management Centre, The University of Queensland, QLD, Australia
| | - Philip Bond
- School of Biomedical Sciences, Queensland University of Technology, QLD, Australia
| | - Guangming Jiang
- School of Civil, Mining & Environmental Engineering, University of Wollongong, NSW, Australia.
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Fernandez M, Pereira PP, Agostini E, González PS. How the bacterial community of a tannery effluent responds to bioaugmentation with the consortium SFC 500-1. Impact of environmental variables. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 247:46-56. [PMID: 31229785 DOI: 10.1016/j.jenvman.2019.06.055] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 05/17/2019] [Accepted: 06/11/2019] [Indexed: 06/09/2023]
Abstract
Bioaugmentation with the consortium SFC 500-1 is a promising alternative to remediate wastewaters, such as tannery effluents. With the aim of assessing the changes produced in response to bioaugmentation, bacterial 16S rDNA genes were sequenced with Illumina MiSeq Platform. Additionally, bacterial and fungal groups were analyzed through standard culture dependent methods. The impact of diverse physico-chemical and microbiological parameters on the prokaryotic diversity was also evaluated throughout. Bacteroidetes, Firmicutes and Proteobacteria, represented together up to 91% of the total number of sequences obtained from the tannery effluent. Diversity decreased immediately after inoculation, due to an increase in the representation of the taxa to which the added consortium belongs. However, bioaugmentation produced no greater variations since only a 10% of unique operational taxonomic units were found in the inoculated treatment. An increase in the abundance of Myroides and a reduction in the representation of Proteiniclasticum and Halomonas were major observed variations. On the other hand, pH and dissolved oxygen constituted main environmental factors affecting the structure of the prokaryotic communities. In all treatments yeasts increased over time, to the detriment of filamentous fungi. Together, data from this report may contribute to the development of improved bioremediation strategies of industrial wastewaters.
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Affiliation(s)
- Marilina Fernandez
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina; CONICET, UNRC, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina.
| | - Paola P Pereira
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina; CONICET, UNRC, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina.
| | - Elizabeth Agostini
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina; CONICET, UNRC, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina.
| | - Paola S González
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina; CONICET, UNRC, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina.
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Singh AK, Chandra R. Pollutants released from the pulp paper industry: Aquatic toxicity and their health hazards. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2019; 211:202-216. [PMID: 31029991 DOI: 10.1016/j.aquatox.2019.04.007] [Citation(s) in RCA: 112] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Revised: 03/11/2019] [Accepted: 04/09/2019] [Indexed: 06/09/2023]
Abstract
The pulp paper industries release wastewater containing very complex organic and inorganic pollutants. These pollutants are discharged mainly pulping and bleaching process during paper manufacturing. The main gaseous pollutants hydrogen sulfides, sodium sulfide, methyl mercaptan, sulfur, and chlorine dioxide is reported for chronic, respiratory disorder and irritation to skin, eyes and cardiac problem along with nausea and headache. The major inorganic pollutants include ferrous, copper, zinc, nickel, and magnesium, which is reported for neurotoxicity, toxic to juvenile channel catfish (Ictalurus punctatus) and Accumulation to gill > liver > ovary > muscle. The detected major organic and inorganic pollutants are hexadecanoic acids, octacosane, β-sitosterol trimethylsilyl ether, 1-tetradecane, 2-methoxy phenol, trichlorocatechol, tetrachlorocatechol, chlorophenols, chloroguaiacols, chlorosyringols, chlorocatechols, terpenes, methanol, phenol, alkylated phenols, decalone, benzoic acid, abietic acid, and dehydroabietic acid. Several of these compounds are reported as endocrine-disrupting chemicals (EDCs). Therefore, direct toxicity of effluent to the reproductive system in aquatic flora and fauna are reported. Several reports have highlighted reduced gonad size, change in secondary sexual character, delayed maturity and suppression of sex hormone in fish rainbow trout (Oncorhynchus mykiss) and mosquitofish (Gambusia holbrooki) further the in-vitro studies of organic compounds on fish, Salmonella typhimurium, Vibrio fischeri, and Saccharomyces have shown inhibition in growth and luminescence properties. The presence of organic and inorganic pollutants in pulp paper industry wastewater causes phytotoxicity chromosomal aberration in Allium cepa. Thus the manuscript has concluded that detected pollutants produced foul odors and cause hermaphroditism in fish, hepatotoxicity and mutagenic effect. In addition, the growth of coliform bacteria in River and other aquatic resources has been reported due to contamination of PPI effluent. The studies also highlighted the presence of tannins, chlorophenols, dioxins, furans, biocide, fatty acids, and resin acids along with chlorolignine compounds as persistent organic pollutants (POP), which needs special attention for pollution prevention of rivers, lakes and other aquatic resources.
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Affiliation(s)
- Ajay Kumar Singh
- Department of Environmental Microbiology, School of Environmental Sciences, Babasaheb Bhimrao Ambedkar University, Vidya Vihar Raibareli Road, Lucknow 226025, India
| | - Ram Chandra
- Department of Environmental Microbiology, School of Environmental Sciences, Babasaheb Bhimrao Ambedkar University, Vidya Vihar Raibareli Road, Lucknow 226025, India.
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6
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Papageorgiou M, Tselios C, Varotsis C. Photosensitivity responses ofSagittula stellataprobed by FTIR, fluorescence and Raman microspectroscopy. RSC Adv 2019; 9:27391-27397. [PMID: 35529232 PMCID: PMC9070597 DOI: 10.1039/c9ra03630j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Accepted: 08/26/2019] [Indexed: 12/05/2022] Open
Abstract
Raman, fluorescence and FTIR experiments of prestine Sagittula stellata and Sagittula stellata–metal ion complexes grown in light and in dark were performed to probe the photosensitivity response of the cellular components in the marine bacterium. In the presence of Cu(ii) and Zn(ii) the frequency shifts of PO2−, C–O–C and C–O–P vibrations indicate metal binding to nucleic acids, carbohydrates and polysaccharides. We assign the observed bands in the 514.1 nm Raman spectra of the prestine S. Stellata and of the extracted carotenoids to the C
Created by potrace 1.16, written by Peter Selinger 2001-2019
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C and C–C stretching vibrations. The fluorescence excitation–emission matrix (EEM) of S. stellata in light, dark and in the presence of metal ions are reported and compared with the Raman and FTIR data. The novel ability of S. stellata although heterotrophic, to show light-dependent metal binding ability may be an important feature property that maintains a stable heterotroph–prototroph interaction and a dynamic system. Raman, fluorescence and FTIR experiments of prestine Sagittula stellata and Sagittula stellata–metal ion complexes grown in light and in dark were performed to probe the photosensitivity response of the cellular components in the marine bacterium.![]()
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Affiliation(s)
- Marios Papageorgiou
- Department of Environmental Science and Technology
- Cyprus University of Technology
- Lemesos
- Cyprus
| | - Charalampos Tselios
- Department of Environmental Science and Technology
- Cyprus University of Technology
- Lemesos
- Cyprus
| | - Constantinos Varotsis
- Department of Environmental Science and Technology
- Cyprus University of Technology
- Lemesos
- Cyprus
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7
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Raina JB, Tapiolas D, Motti CA, Foret S, Seemann T, Tebben J, Willis BL, Bourne DG. Isolation of an antimicrobial compound produced by bacteria associated with reef-building corals. PeerJ 2016; 4:e2275. [PMID: 27602265 PMCID: PMC4994080 DOI: 10.7717/peerj.2275] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2016] [Accepted: 07/19/2016] [Indexed: 12/28/2022] Open
Abstract
Bacterial communities associated with healthy corals produce antimicrobial compounds that inhibit the colonization and growth of invasive microbes and potential pathogens. To date, however, bacteria-derived antimicrobial molecules have not been identified in reef-building corals. Here, we report the isolation of an antimicrobial compound produced by Pseudovibrio sp. P12, a common and abundant coral-associated bacterium. This strain was capable of metabolizing dimethylsulfoniopropionate (DMSP), a sulfur molecule produced in high concentrations by reef-building corals and playing a role in structuring their bacterial communities. Bioassay-guided fractionation coupled with nuclear magnetic resonance (NMR) and mass spectrometry (MS), identified the antimicrobial as tropodithietic acid (TDA), a sulfur-containing compound likely derived from DMSP catabolism. TDA was produced in large quantities by Pseudovibrio sp., and prevented the growth of two previously identified coral pathogens, Vibrio coralliilyticus and V. owensii, at very low concentrations (0.5 μg/mL) in agar diffusion assays. Genome sequencing of Pseudovibrio sp. P12 identified gene homologs likely involved in the metabolism of DMSP and production of TDA. These results provide additional evidence for the integral role of DMSP in structuring coral-associated bacterial communities and underline the potential of these DMSP-metabolizing microbes to contribute to coral disease prevention.
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Affiliation(s)
- Jean-Baptiste Raina
- Climate Change Cluster (C3), University of Technology Sydney, Sydney, NSW, Australia; Australian Institute of Marine Science, Townsville, QLD, Australia; Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD, Australia; Marine Biology and Aquaculture, College of Science and Engineering, James Cook University of North Queensland, Townsville, QLD, Australia; AIMS@JCU, James Cook University, Townsville, QLD, Australia
| | - Dianne Tapiolas
- Australian Institute of Marine Science , Townsville, QLD , Australia
| | - Cherie A Motti
- Australian Institute of Marine Science , Townsville, QLD , Australia
| | - Sylvain Foret
- Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD, Australia; Research School of Biology, Australian National University, Canberra, ACT, Australia
| | - Torsten Seemann
- Victorian Life Sciences Computation Initiative, University of Melbourne , Melbourne, Victoria , Australia
| | - Jan Tebben
- Section Chemical Ecology, Alfred Wegener Institute, Bremerhaven, Germany; University of New South Wales, Sydney, NSW, Australia
| | - Bette L Willis
- Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD, Australia; Marine Biology and Aquaculture, College of Science and Engineering, James Cook University of North Queensland, Townsville, QLD, Australia
| | - David G Bourne
- Australian Institute of Marine Science, Townsville, QLD, Australia; Marine Biology and Aquaculture, College of Science and Engineering, James Cook University of North Queensland, Townsville, QLD, Australia
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A bacterial pathogen uses dimethylsulfoniopropionate as a cue to target heat-stressed corals. ISME JOURNAL 2013; 8:999-1007. [PMID: 24335830 DOI: 10.1038/ismej.2013.210] [Citation(s) in RCA: 103] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Revised: 10/06/2013] [Accepted: 10/08/2013] [Indexed: 11/08/2022]
Abstract
Diseases are an emerging threat to ocean ecosystems. Coral reefs, in particular, are experiencing a worldwide decline because of disease and bleaching, which have been exacerbated by rising seawater temperatures. Yet, the ecological mechanisms behind most coral diseases remain unidentified. Here, we demonstrate that a coral pathogen, Vibrio coralliilyticus, uses chemotaxis and chemokinesis to target the mucus of its coral host, Pocillopora damicornis. A primary driver of this response is the host metabolite dimethylsulfoniopropionate (DMSP), a key element in the global sulfur cycle and a potent foraging cue throughout the marine food web. Coral mucus is rich in DMSP, and we found that DMSP alone elicits chemotactic responses of comparable intensity to whole mucus. Furthermore, in heat-stressed coral fragments, DMSP concentrations increased fivefold and the pathogen's chemotactic response was correspondingly enhanced. Intriguingly, despite being a rich source of carbon and sulfur, DMSP is not metabolized by the pathogen, suggesting that it is used purely as an infochemical for host location. These results reveal a new role for DMSP in coral disease, demonstrate the importance of chemical signaling and swimming behavior in the recruitment of pathogens to corals and highlight the impact of increased seawater temperatures on disease pathways.
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Zhang L, Liu N, Ma X, Jiang L. The transcriptional control machinery as well as the cell wall integrity and its regulation are involved in the detoxification of the organic solvent dimethyl sulfoxide in Saccharomyces cerevisiae. FEMS Yeast Res 2012; 13:200-18. [PMID: 23157175 DOI: 10.1111/1567-1364.12022] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2012] [Revised: 10/08/2012] [Accepted: 11/08/2012] [Indexed: 11/30/2022] Open
Abstract
In the present study, we have identified 339 dimethyl sulfoxide (DMSO)-sensitive and nine DMSO-tolerant gene mutations in Saccharomyces cerevisiae through a functional genomics approach. Twelve of these identified DMSO-sensitive mutations are of genes involved in the general control of gene expression mediated by the SWR1 complex and the RNA polymerase II mediator complex, whereas 71 of them are of genes involved in the protein trafficking and vacuolar sorting processes. In addition, twelve of these DMSO-sensitive mutations are of genes involved in the cell wall integrity (CWI) and its regulation. DMSO-tolerant mutations are of genes mainly involved in the metabolism and the gene expression control. Therefore, the transcriptional control machinery, the CWI and its regulation as well as the protein trafficking and sorting process play critical roles in the DMSO detoxification in yeast cells.
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Affiliation(s)
- Lilin Zhang
- Department of Molecular and Cellular Pharmacology, School of Pharmaceutical Science and Technology, Tianjin University, Tianjin, China
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Liu M, Dong Y, Zhao Y, Zhang G, Zhang W, Xiao T. Structures of bacterial communities on the surface of Ulva prolifera and in seawaters in an Ulva blooming region in Jiaozhou Bay, China. World J Microbiol Biotechnol 2010. [DOI: 10.1007/s11274-010-0627-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Schäfer H, Myronova N, Boden R. Microbial degradation of dimethylsulphide and related C1-sulphur compounds: organisms and pathways controlling fluxes of sulphur in the biosphere. JOURNAL OF EXPERIMENTAL BOTANY 2009; 61:315-334. [PMID: 20007683 DOI: 10.1093/jxb/erp355] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Dimethylsulphide (DMS) plays a major role in the global sulphur cycle. It has important implications for atmospheric chemistry, climate regulation, and sulphur transport from the marine to the atmospheric and terrestrial environments. In addition, DMS acts as an info-chemical for a wide range of organisms ranging from micro-organisms to mammals. Micro-organisms that cycle DMS are widely distributed in a range of environments, for instance, oxic and anoxic marine, freshwater and terrestrial habitats. Despite the importance of DMS that has been unearthed by many studies since the early 1970s, the understanding of the biochemistry, genetics, and ecology of DMS-degrading micro-organisms is still limited. This review examines current knowledge on the microbial cycling of DMS and points out areas for future research that should shed more light on the role of organisms degrading DMS and related compounds in the biosphere.
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Shu CH, Chen CK. Enhanced removal of dimethyl sulfide from a synthetic waste gas stream using a bioreactor inoculated with Microbacterium sp. NTUT26 and Pseudomonas putida. J Ind Microbiol Biotechnol 2008; 36:95-104. [DOI: 10.1007/s10295-008-0476-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2008] [Accepted: 09/16/2008] [Indexed: 10/21/2022]
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Pacheco Aguilar JR, Peña Cabriales JJ, Maldonado Vega M. Identification and characterization of sulfur-oxidizing bacteria in an artificial wetland that treats wastewater from a tannery. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2008; 10:359-370. [PMID: 19260219 DOI: 10.1080/15226510802100390] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Wastewater from tanneries contains high concentrations of organic matter, chromium, nitrogen, and sulfur compounds. In this study, an artificial wetland is is used as the tertiary treatment in a tannery in León Gto., México. It consists of three subplots with an area of about 450 m2. Two subplots were planted with Typha sp. and the third with Scirpus americanus. Geochemical analyses along the flowpath of the wetland show that contaminants were effectively attenuated. The most probable number technique was used to determine rhizospheric microbial populations involved in the sulfur cycle and suggested that there were 104-10(6) cells g(-1) sediment of sulfate-reducing bacteria and 10(2)-10(5) of sulfur-oxidizing bacteria (SOB). Representatives of SOB were isolated on media containing thiosulfate. Phylogenetic analysis of 16S rRNA of SOB isolates shows that they belong to the genera Acinetobacter, Alcaligenes, Ochrobactrum, and Pseudomonas. Most of the isolates are organotrophic and can oxidize reduced sulfur compounds such as elemental sulfur or thiosulfate, accumulating thiosulfate, or tetrathionate during growth. All isolates can use reduced-sulfur compounds as their sole sulfur source and some can use nitrate as an electron acceptor to grow anaerobically. Our results illustrate the relevance of SOB in the functioning of the wetland constructed for tannery wastewater remediation.
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Schäfer H. Isolation of Methylophaga spp. from marine dimethylsulfide-degrading enrichment cultures and identification of polypeptides induced during growth on dimethylsulfide. Appl Environ Microbiol 2007; 73:2580-91. [PMID: 17322322 PMCID: PMC1855583 DOI: 10.1128/aem.02074-06] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Dimethylsulfide (DMS)-degrading enrichment cultures were established from samples of coastal seawater, nonaxenic Emiliania huxleyi cultures, and mixed marine methyl halide-degrading enrichment cultures. Bacterial populations from a broad phylogenetic range were identified in the mixed DMS-degrading enrichment cultures by denaturing gradient gel electrophoresis (DGGE). Sequences of dominant DGGE bands were similar to those of members of the genera Methylophaga and Alcanivorax. Several closely related Methylophaga strains were obtained that were able to grow on DMS as the carbon and energy source. Roseobacter-related populations were detected in some of the enrichment cultures; however, none of the Roseobacter group isolates that were tested were able to grow on DMS. Oxidation of DMS by Methylophaga sp. strain DMS010 was not affected by addition of the inhibitor chloroform or methyl tert-butyl ether, suggesting that DMS metabolism may occur by a route different from those described for Thiobacillus species and other unidentified marine isolates. Addition of DMS and methanethiol to whole-cell suspensions of strain DMS010 induced oxygen uptake when strain DMS010 was grown on DMS but not in cells grown on methanol. The apparent K(m)s of strain DMS010 for DMS and for methanethiol were 2.1 and 4.6 microM, respectively, when grown on DMS. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis of the biomass of strain DMS010 and analysis of peptide bands by mass spectrometry techniques and N-terminal sequencing provided the first insight into the identity of polypeptides induced during growth on DMS. These included XoxF, a homolog of the large subunit of methanol dehydrogenase for which a biological role has not been identified previously.
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MESH Headings
- Bacterial Proteins/biosynthesis
- Base Sequence
- Chloroform/pharmacology
- DNA, Bacterial/analysis
- DNA, Bacterial/chemistry
- DNA, Bacterial/genetics
- DNA, Bacterial/isolation & purification
- DNA, Ribosomal/chemistry
- DNA, Ribosomal/genetics
- Electrophoresis, Polyacrylamide Gel
- Enzyme Inhibitors/pharmacology
- Gene Expression Regulation, Bacterial
- Mass Spectrometry
- Methyl Ethers/pharmacology
- Molecular Sequence Data
- Oxygen Consumption
- Phylogeny
- Piscirickettsiaceae/classification
- Piscirickettsiaceae/genetics
- Piscirickettsiaceae/isolation & purification
- Piscirickettsiaceae/metabolism
- Proteome/analysis
- RNA, Ribosomal, 16S/genetics
- Seawater/microbiology
- Sequence Homology, Nucleic Acid
- Sulfhydryl Compounds/metabolism
- Sulfides/metabolism
- Water Microbiology
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Affiliation(s)
- Hendrik Schäfer
- Department of Biological Sciences, University of Warwick, Coventry, UK.
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16
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Vila-Costa M, Del Valle DA, González JM, Slezak D, Kiene RP, Sánchez O, Simó R. Phylogenetic identification and metabolism of marine dimethylsulfide-consuming bacteria. Environ Microbiol 2007; 8:2189-200. [PMID: 17107560 DOI: 10.1111/j.1462-2920.2006.01102.x] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Microbial consumption is one of the main processes, along with photolysis and ventilation, that remove the biogenic trace gas dimethylsulfide (DMS) from the surface ocean. Although a few isolates of marine bacteria have been studied for their ability to utilize DMS, little is known about the characteristics or phylogenetic affiliation of DMS consumers in seawater. We enriched coastal and open-ocean waters with different carbon sources to stimulate different bacterial communities (glucose-consuming bacteria, methyl group-consuming bacteria and DMS consumers) in order to test how this affected DMS consumption and to examine which organisms might be involved. Dimethylsulfide consumption was greatly stimulated in the DMS addition treatments whereas there was no stimulation in the other treatments. Analysis of microbial DNA by two different techniques (sequenced bands from DGGE gels and clone libraries) showed that bacteria grown specifically with the presence of DMS were closely related to the genus Methylophaga. We also followed the fate of consumed DMS in some of the enrichments. Dimethylsulfide was converted mostly to DMSO in glucose or methanol enrichments, whereas it was converted mostly to sulfate in DMS enrichments, the latter suggesting use of DMS as a carbon and energy source. Our results indicate that unlike the biochemical precursor of DMS, dimethylsulfoniopropionate (DMSP), which is consumed by a broad spectrum of marine microorganisms, DMS seems to be utilized as a carbon and electron source by specialists. This is consistent with the usual observation that DMSP turns over at much higher rates than DMS.
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Affiliation(s)
- Maria Vila-Costa
- Departament de Biologia Marina i Oceanografia, Institut de Ciències del Mar--CMIMA (CSIC), 08003 Barcelona, Catalunya, Spain.
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17
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Dimitriu PA, Shukla SK, Conradt J, Márquez MC, Ventosa A, Maglia A, Peyton BM, Pinkart HC, Mormile MR. Nitrincola lacisaponensis gen. nov., sp. nov., a novel alkaliphilic bacterium isolated from an alkaline, saline lake. Int J Syst Evol Microbiol 2006; 55:2273-2278. [PMID: 16280482 DOI: 10.1099/ijs.0.63647-0] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
A novel alkaliphilic bacterium, strain 4CAT, was isolated from decomposing wood taken from the shore of Soap Lake, a saline, alkaline lake in Grant County, WA, USA. Cells of the isolate were Gram-negative, asporogenous, short, motile rods that utilized only a limited range of organic acids as sole carbon and energy sources. In addition to oxygen, the strain possessed the ability to reduce in the presence of acetate. Strain 4CAT was oxidase- and catalase-positive; it degraded Tween 60, but not DNA, urea, gelatin or starch. It grew at pH values from 7.5 to 11.0, with optimum growth occurring at pH 9.0, and growth was observed in NaCl concentrations of 0.2-1.3 M, with optimum growth at 0.8 M NaCl. The optimum temperature for growth was 37 degrees C. Strain 4CAT was resistant to erythromycin, bacitracin, novobiocin, polymyxin B, neomycin, gentamicin, streptomycin, carbenicillin, rifampicin and tetracycline, and was susceptible to nalidixic acid, chloramphenicol, ampicillin and penicillin. The isolate's 16S rRNA gene sequence indicated that it belonged to the gamma-Proteobacteria, showing 90-94 % similarity to its closest relatives. Maximum-likelihood phylogenetic inferences placed strain 4CAT within a novel lineage related to the marine bacterial genera Neptunomonas and Marinobacterium. The DNA G+C content of the isolate was 47.4 mol%. On the basis of genotypic and phenotypic characterization, it was concluded that strain 4CAT should be placed in a separate taxon as a novel genus and species, with the proposed name Nitrincola lacisaponensis gen. nov., sp. nov. The type strain is 4CAT (=ATCC BAA-920T=DSM 16316T).
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MESH Headings
- Base Composition
- DNA, Bacterial/analysis
- DNA, Bacterial/chemistry
- DNA, Bacterial/genetics
- Fresh Water/microbiology
- Gammaproteobacteria/classification
- Gammaproteobacteria/genetics
- Gammaproteobacteria/growth & development
- Gammaproteobacteria/isolation & purification
- Molecular Sequence Data
- RNA, Ribosomal, 16S/analysis
- RNA, Ribosomal, 16S/chemistry
- RNA, Ribosomal, 16S/genetics
- Sequence Analysis, DNA
- Sodium Chloride/metabolism
- Sodium Chloride/pharmacology
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Affiliation(s)
- Pedro A Dimitriu
- Department of Biological Sciences, University of Missouri-Rolla, Rolla, MO 65401, USA
| | - Sanjay K Shukla
- Marshfield Clinic Research Foundation, 1000 N. Oak Avenue, Marshfield, WI 54449, USA
| | - Jennifer Conradt
- Marshfield Clinic Research Foundation, 1000 N. Oak Avenue, Marshfield, WI 54449, USA
| | - M Carmen Márquez
- Department of Microbiology and Parasitology, University of Sevilla, 41012 Sevilla, Spain
| | - Antonio Ventosa
- Department of Microbiology and Parasitology, University of Sevilla, 41012 Sevilla, Spain
| | - Anne Maglia
- Department of Biological Sciences, University of Missouri-Rolla, Rolla, MO 65401, USA
| | - Brent M Peyton
- Department of Chemical Engineering, Washington State University, Pullman, WA 99164, USA
| | - Holly C Pinkart
- Department of Biological Sciences, Central Washington University, Ellensburg, WA 98926, USA
| | - Melanie R Mormile
- Department of Biological Sciences, University of Missouri-Rolla, Rolla, MO 65401, USA
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18
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Bentley R, Chasteen TG. Environmental VOSCs--formation and degradation of dimethyl sulfide, methanethiol and related materials. CHEMOSPHERE 2004; 55:291-317. [PMID: 14987929 DOI: 10.1016/j.chemosphere.2003.12.017] [Citation(s) in RCA: 149] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2003] [Revised: 12/12/2003] [Accepted: 12/17/2003] [Indexed: 05/07/2023]
Abstract
Volatile organic sulfur compounds (VOSCs) play a major role in the global sulfur cycle. Two components, dimethyl sulfide (DMS) and methanethiol (MT) are formed in large amounts by living systems (e.g. algae, bacteria, plants), particularly in marine environments. A major route to DMS is by action of a lyase enzyme on dimethylsulfoniopropionate (DMSP). DMSP has other roles, for instance as an osmoprotectant and cryoprotectant. Demethiolation of DMSP and other materials leads to MT. A major transport process is release of DMS from the oceans to the atmosphere. Oxidation of DMS in the atmosphere by hydroxyl and nitrate radicals produces many degradation products including CO2, COS, dimethyl sulfoxide, dimethyl sulfone, organic oxyacids of sulfur, and sulfate. These materials also have roles in biotic processes and there are complex metabolic interrelationships between some of them. This review emphasizes the chemical reactions of the organic sulfur cycle. For biotic reactions, details of relevant enzymes are provided when possible.
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Affiliation(s)
- Ronald Bentley
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA
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19
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Kino K, Murakami-Nitta T, Oishi M, Ishiguro S, Kirimura K. Isolation of dimethyl sulfone-degrading microorganisms and application to odorless degradation of dimethyl sulfoxide. J Biosci Bioeng 2004; 97:82-4. [PMID: 16233595 DOI: 10.1016/s1389-1723(04)70171-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2003] [Accepted: 10/25/2003] [Indexed: 11/25/2022]
Abstract
With the objective of developing an odorless biodegradation process for dimethyl sulfoxide (DMSO), Hyphomicrobium sp. WU-OM3 was isolated. During the cultivation of strain WU-OM3 cells with 20 mM dimethyl sulfone (DMSO2) as the sole carbon source, DMSO2 was completely consumed within 48 h and sulfate ion accumulated in the culture broth. Methanesulfonate was also detected as an intermediate of DMSO2 degradation. By combining the DMSO-oxidizing microorganism and strain WU-OM3 cells, 0.64 mM (50 mg/l) DMSO was degraded to sulfate ion with 80% molar conversion ratio.
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Affiliation(s)
- Kuniki Kino
- Department of Applied Chemistry, School of Science and Engineering, Waseda University, 3-4-1 Ohkubo, Tokyo 169-8555, Japan.
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20
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Murata Y, Watanabe T, Sato M, Momose Y, Nakahara T, Oka SI, Iwahashi H. Dimethyl sulfoxide exposure facilitates phospholipid biosynthesis and cellular membrane proliferation in yeast cells. J Biol Chem 2003; 278:33185-93. [PMID: 12771156 DOI: 10.1074/jbc.m300450200] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Me2SO is a polar solvent that is widely used in biochemistry, pharmacology, and industry. Although there are several reports in the literature concerning the biological effects of Me2SO, the total cellular response remains unclear. In this paper, DNA microarray technology combined with the hierarchical clustering bioinformatics tool was used to assess the effects of Me2SO on yeast cells. We found that yeast exposed to Me2SO increased phospholipid biosynthesis through up-regulated gene expression. It was confirmed by Northern blotting that the level of INO1 and OPI3 gene transcripts, encoding key enzymes in phospholipid biosynthesis, were significantly elevated following treatment with Me2SO. Furthermore, the phospholipid content of the cells increased during exposure to Me2SO as shown by conspicuous incorporation of a lipophilic fluorescent dye (3,3'-dihexyloxacarbocyanine iodide) into the cell membranes. From these results we propose that Me2SO treatment induces membrane proliferation in yeast cells to alleviate the adverse affects of this chemical on membrane integrity.
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Affiliation(s)
- Yoshinori Murata
- International Patent Organism Depositary, National Institute of Advanced Industrial Science Technology, Central 6, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8566, Japan
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21
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Hirano H, Yoshida T, Fuse H, Endo T, Habe H, Nojiri H, Omori T. Marinobacterium sp. strain DMS-S1 uses dimethyl sulphide as a sulphur source after light-dependent transformation by excreted flavins. Environ Microbiol 2003; 5:503-9. [PMID: 12755717 DOI: 10.1046/j.1462-2920.2003.00444.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Marinobacterium sp. strain DMS-S1 is a unique marine bacterium that can use dimethyl sulphide (DMS) as a sulphur source only in the presence of light. High-performance liquid chromatography (HPLC) analyses of the culture supernatant revealed that excreted factors, which could transform DMS to dimethyl sulphoxide (DMSO) under light, are FAD and riboflavin. In addition, FAD appeared to catalyse the photolysis of DMS to not only DMSO but also methanesulphonate (MSA), formate, formaldehyde and sulphate. As strain DMS-S1 can use sulphate and MSA as a sole sulphur source independently of light, the excretion of flavins appeared to support the growth on DMS under light. Furthermore, three out of 12 marine bacteria from IAM culture collection were found to be able to grow on DMS with the aid of photolysis by the flavins excreted. This is the first report that bacteria can use light to assimilate oceanic organic sulphur compounds outside the cells by excreting flavins as photosensitizers.
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Affiliation(s)
- Hiroyuki Hirano
- Biotechnology Research Center, The University of Tokyo, 1-1-1 Yayoi, Bunkyoku, Tokyo 113-8657, Japan
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22
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Endoh T, Habe H, Yoshida T, Nojiri H, Omori T. A CysB-regulated and sigma54-dependent regulator, SfnR, is essential for dimethyl sulfone metabolism of Pseudomonas putida strain DS1. MICROBIOLOGY (READING, ENGLAND) 2003; 149:991-1000. [PMID: 12686641 DOI: 10.1099/mic.0.26031-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Pseudomonas putida strain DS1 utilizes dimethyl sulfide (DMS) as a sulfur source, and desulfurizes it via dimethyl sulfoxide (DMSO), dimethyl sulfone (DMSO(2)) and methanesulfonate (MSA). Its Tn5 mutant, Dfi74J, no longer utilized DMS, DMSO and DMSO(2), but could oxidize DMS to DMSO(2), suggesting that the conversion of DMSO(2) to MSA was interrupted in the mutant. Sequencing of the Tn5 flanking region of Dfi74J demonstrated that a gene, sfnR (designated for dimethyl sulfone utilization), encoding a transcriptional regulator containing an ATP-dependent sigma(54)-association domain and a DNA-binding domain, was disrupted. sfnR is part of an operon with two other genes, sfnE and sfnC, located immediately upstream of sfnR and in the same orientation. The genes encode NADH-dependent FMN reductase (SfnE) and FMNH(2)-dependent monooxygenase (SfnC). Complementation of Dfi74J with an sfnR-expressing plasmid led to restoration of its growth on DMS, DMSO and DMSO(2). An rpoN-defective mutant of strain DS1, which lacks the sigma(54) factor, grew on MSA, but not on DMS, DMSO and DMSO(2), indicating that SfnR controls expression of gene(s) involved in DMSO(2) metabolism by interaction with sigma(54)-RNA polymerase. Northern hybridization and a reporter gene assay with an sfn-lacZ transcriptional fusion elucidated that expression of the sfnECR operon was induced under sulfate limitation and was dependent on a LysR-type transcriptional regulator, CysB. This is believed to be the first report that a sigma(54)-dependent transcriptional regulator induced under sulfate limitation is involved in sulfur assimilation.
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Affiliation(s)
- Takayuki Endoh
- Biotechnology Research Center, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Hiroshi Habe
- Biotechnology Research Center, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Takako Yoshida
- Biotechnology Research Center, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Hideaki Nojiri
- Biotechnology Research Center, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
| | - Toshio Omori
- Biotechnology Research Center, The University of Tokyo, Yayoi 1-1-1, Bunkyo-ku, Tokyo 113-8657, Japan
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23
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Friedrich U, Van Langenhove H, Altendorf K, Lipski A. Microbial community and physicochemical analysis of an industrial waste gas biofilter and design of 16S rRNA-targeting oligonucleotide probes. Environ Microbiol 2003; 5:183-201. [PMID: 12588298 DOI: 10.1046/j.1462-2920.2003.00397.x] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
A study was conducted to investigate the microbial community structure, the physicochemical properties, and the relationships between these parameters of a full-scale industrial biofilter used for waste gas abatement in an animal-rendering plant. Fluorescence in situ hybridization (FISH) was successfully combined with digital image analysis to study the composition of the microbial community. Several new nucleic acid probes were designed and established based on published 16S rDNA sequences and on ones retrieved from the biomass of the biofilter under investigation. Bacterial detection rates varied greatly over time and filterbed depth between 27.2% and 88.1% relative to DAPI counts. Overall, members of the Betaproteobacteria followed by Actinobacteria, Alphaproteobacteria, Cytophaga-Flavobacteria, Firmicutes and Gammaproteobacteria were the most abundant groups. Among the groups below phylum level, members of the Alcaligenes/Bordetella lineage were on average the most abundant group accounting for up to 8.5% of DAPI-stained cells. Whereas the community composition generally showed no vertical gradient, the lower 50 cm of the biofilter proved to be the most active part for the degradation of aldehydes such as 2- and 3-methylbutanal, 2-methylpropanal, and hexanal. This zone of the filterbed being operated in up-flow direction degraded about 80% of these compounds. Dimethyldisulphide was the most common reduced sulphur compound. Statistical analysis of microbial versus waste gas parameters generally revealed only weak or non-significant correlations between the two. Possible explanations for this finding are discussed.
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Affiliation(s)
- Udo Friedrich
- Abteilung Mikrobiologie, Fachbereich Biologie/Chemie, Universität Osnabrück, 49069 Osnabrück, Germany.
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