Biofilm growth and near-infrared radiation-driven photosynthesis of the chlorophyll d-containing cyanobacterium Acaryochloris marina

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dc.contributor.author Behrendt, Lars en_US
dc.contributor.author Schrameyer, Verena en_US
dc.contributor.author Qvortrup, Klaus en_US
dc.contributor.author Lundin, Luisa en_US
dc.contributor.author S??Rensen, S??Ren en_US
dc.contributor.author Larkum, Anthony en_US
dc.contributor.author Kuhl, Michael en_US
dc.contributor.editor en_US
dc.date.accessioned 2012-10-12T03:33:33Z
dc.date.available 2012-10-12T03:33:33Z
dc.date.issued 2012 en_US
dc.identifier 2011003913 en_US
dc.identifier.citation Behrendt Lars et al. 2012, 'Biofilm growth and near-infrared radiation-driven photosynthesis of the chlorophyll d-containing cyanobacterium Acaryochloris marina', ASM, vol. 78, no. 11, pp. 3896-3904. en_US
dc.identifier.issn 0099-2240 en_US
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/18205
dc.description.abstract The cyanobacterium Acaryochloris marina is the only known phototroph harboring chlorophyll (Chl) d. It is easy to cultivate it in a planktonic growth mode, and A. marina cultures have been subject to detailed biochemical and biophysical characterization. In natural situations, A. marina is mainly found associated with surfaces, but this growth mode has not been studied yet. Here, we show that the A. marina type strain MBIC11017 inoculated into alginate beads forms dense biofilm-like cell clusters, as in natural A. marina biofilms, characterized by strong O-2 concentration gradients that change with irradiance. Biofilm growth under both visible radiation (VIS, 400 to 700 nm) and near-infrared radiation (NIR, similar to 700 to 730 nm) yielded maximal cell-specific growth rates of 0.38 per day and 0.64 per day, respectively. The population doubling times were 1.09 and 1.82 days for NIR and visible light, respectively. The photosynthesis versus irradiance curves showed saturation at a photon irradiance of E-k (saturating irradiance) >250 mu mol photons m(-2) s(-1) for blue light but no clear saturation at 365 mu mol photons m(-2) s(-1) for NIR. The maximal gross photosynthesis rates in the aggregates were similar to 1,272 mu mol O-2 mg Chl d(-1) h(-1) (NIR) and similar to 1,128 mu mol O-2 mg Chl d(-1) h(-1) (VIS). The photosynthetic efficiency (alpha) values were higher in NIR-irradiated cells [(268 +/- 0.29) x 10(-6) m(2) mg Chl d(-1) (mean +/- standard deviation)] than under blue light [(231 +/- 0.22) x 10(-6) m(2) mg Chl d(-1)]. A. marina is well adapted to a biofilm growth mode under both visible and NIR irradiance and under O-2 conditions ranging from anoxia to hyperoxia, explaining its presence in natural niches with similar environmental conditions. en_US
dc.language en_US
dc.publisher ASM en_US
dc.relation.isbasedon http://dx.doi.org/10.1128/AEM.00397-12 en_US
dc.title Biofilm growth and near-infrared radiation-driven photosynthesis of the chlorophyll d-containing cyanobacterium Acaryochloris marina en_US
dc.parent Applied and Environmental Microbiology en_US
dc.journal.volume 78 en_US
dc.journal.number 11 en_US
dc.publocation USA en_US
dc.identifier.startpage 3896 en_US
dc.identifier.endpage 3904 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 060000 en_US
dc.personcode 0000067754 en_US
dc.personcode 106921 en_US
dc.personcode 0000067756 en_US
dc.personcode 0000076492 en_US
dc.personcode 0000067757 en_US
dc.personcode 111269 en_US
dc.personcode 107129 en_US
dc.percentage 25 en_US
dc.classification.name Biological Sciences en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords PHOTOSYSTEM-II; CHROMATIC PHOTOACCLIMATION; PIGMENT COMPOSITION; NICHE ADAPTATION; MICROBIAL MAT; INTACT-CELLS; CHL-D; PROKARYOTE; OXYGEN; OXYPHOTOBACTERIUM en_US
dc.staffid en_US
dc.staffid 107129 en_US


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