Biofilm Growth and Near-Infrared Radiation-Driven Photosynthesis of the Chlorophyll d-Containing Cyanobacterium Acaryochloris marina

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Show simple item record Behrendt, L Schrameyer, V Qvortrup, K Lundin, L Sørensen, SJ Larkum, AWD Kühl, M 2012-10-12T03:33:33Z 2012-06
dc.identifier.citation Applied and Environmental Microbiology, 2012, 78 (11), pp. 3896 - 3904
dc.identifier.issn 0099-2240
dc.identifier.other C1 en_US
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 O2 concentration gradients that change with irradiance. Biofilm growth under both visible radiation (VIS, 400 to 700 nm) and near-infrared radiation (NIR, ~ 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 Ek (saturating irradiance) >250 μmol photonsm-2 s-1 for blue light but no clear saturation at 365 μmol photonsm -2 s-1 for NIR. The maximal gross photosynthesis rates in the aggregates were ~ 1,272 μmol O2 mg Chl d -1 h -1 (NIR) and ~ 1,128 μmol O2 mg Chl d-1 h-1 (VIS). The photosynthetic efficiency (α) values were higher in NIR-irradiated cells [(268 ± 0.29) × 10-6m2 mg Chl d-1 (mean ± standard deviation)] than under blue light [(231 ± 0.22) × 10-6m2 mg Chl d-1]. A. marina is well adapted to a biofilm growth mode under both visible and NIR irradiance and under O2 conditions ranging from anoxia to hyperoxia, explaining its presence in natural niches with similar environmental conditions. © 2012, American Society for Microbiology.
dc.language eng
dc.relation.isbasedon 10.1128/AEM.00397-12
dc.title Biofilm Growth and Near-Infrared Radiation-Driven Photosynthesis of the Chlorophyll d-Containing Cyanobacterium Acaryochloris marina
dc.type Journal Article
dc.description.version Published
dc.parent Applied and Environmental Microbiology
dc.journal.volume 11
dc.journal.volume 78
dc.journal.number 11 en_US
dc.publocation USA en_US
dc.publocation Piscataway, USA
dc.identifier.startpage 3896 en_US
dc.identifier.endpage 3904 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.conference International Conference on Broadband and Biomedical Communications
dc.for 0704 Fisheries Sciences
dc.for 0607 Plant Biology
dc.personcode 111269
dc.personcode 107129
dc.personcode 106921
dc.percentage 50 en_US Plant Biology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US 2011-11-21
dc.location.activity en_US
dc.location.activity Melbourne, Australia
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Senior DVC
pubs.organisational-group /University of Technology Sydney/Senior DVC/Jumbunna
pubs.organisational-group /University of Technology Sydney/Strength - C3
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc true
utslib.collection.history Closed (ID: 3)

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