| Two-dimensional mapping of photopigment distribution and activity of Chloroflexus-like bacteria in a hypersaline microbial mat. | |
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MedLine Citation:
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PMID: 18616583 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Pigment analysis in an intact hypersaline microbial mat by hyperspectral imaging revealed very patchy and spatially uncorrelated distributions of photopigments Chl a and BChl a/c, which are characteristic photopigments for oxygenic (diatoms and cyanobacteria) and anoxygenic phototrophs (Chloroflexaceae). This finding is in contrast to the expectation that these biomarker pigments should be spatially correlated, as oxygenic phototrophs are thought to supply the Chloroflexaceae members with organic substrates for growth. We suggest that the heterogeneous occurrence is possibly due to sulfide, whose production by sulfate-reducing bacteria may be spatially heterogeneous in the partially oxic photic zone of the mat. We furthermore mapped the near-infra-red-light controlled respiration of Chloroflexaceae under light and dark conditions and found that Chloroflexaceae are responsible for a major part of oxygen consumption at the lower part of the oxic zone in the mat. The presence of Chloroflexaceae was further confirmed by FISH probe and 16S rRNA gene clone library analysis. We assume that species related to the genera Oscillochloris and 'Candidatus Chlorothrix', in contrast to those related to Chloroflexus and Roseiflexus, depend less on excreted photosynthates but more on the presence of free sulfide, which may explain their presence in deeper parts of the mat. |
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Authors:
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Ami Bachar; Lubos Polerecky; Jan P Fischer; Kyriakos Vamvakopoulos; Dirk de Beer; Henk M Jonkers |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't Date: 2008-07-08 |
Journal Detail:
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Title: FEMS microbiology ecology Volume: 65 ISSN: 0168-6496 ISO Abbreviation: FEMS Microbiol. Ecol. Publication Date: 2008 Sep |
Date Detail:
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Created Date: 2008-09-17 Completed Date: 2008-10-06 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8901229 Medline TA: FEMS Microbiol Ecol Country: England |
Other Details:
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Languages: eng Pagination: 434-48 Citation Subset: IM |
Affiliation:
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Max-Planck-Institute for Marine Microbiology, Bremen, Germany. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Bacteriochlorophylls
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biosynthesis* Chloroflexus / genetics, metabolism* Chromatography, High Pressure Liquid DNA, Bacterial / genetics Gene Library Genes, Bacterial Genes, rRNA In Situ Hybridization, Fluorescence Light Oxygen Consumption Photosynthesis RNA, Ribosomal, 16S / genetics Spectrometry, Fluorescence / methods* Sulfates / metabolism Sulfides / metabolism Water Microbiology* |
| Chemical | |
Reg. No./Substance:
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0/Bacteriochlorophylls; 0/DNA, Bacterial; 0/RNA, Ribosomal, 16S; 0/Sulfates; 0/Sulfides |
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