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    Rapid Reactivation of Cyanobacterial Photosynthesis and Migration upon Rehydration of Desiccated Marine Microbial Mats

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    Type
    Article
    Authors
    Chennu, Arjun
    Grinham, Alistair
    Polerecky, Lubos
    de Beer, Dirk
    Alnajjar, Mohammad Ahmad cc
    KAUST Department
    Red Sea Research Center (RSRC)
    Date
    2015-12-24
    Permanent link to this record
    http://hdl.handle.net/10754/592818
    
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    Abstract
    Desiccated cyanobacterial mats are the dominant biological feature in the Earth’s arid zones. While the response of desiccated cyanobacteria to rehydration is well-documented for terrestrial systems, information about the response in marine systems is lacking. We used high temporal resolution hyperspectral imaging, liquid chromatography, pulse-amplitude fluorometry, oxygen microsensors, and confocal laser microscopy to study this response in a desiccated microbial mat from Exmouth Gulf, Australia. During the initial 15 min after rehydration chlorophyll a concentrations increased 2–5 fold and cyanobacterial photosynthesis was re-established. Although the mechanism behind this rapid increase of chlorophyll a remains unknown, we hypothesize that it involves resynthesis from a precursor stored in desiccated cyanobacteria. The subsequent phase (15 min–48 h) involved migration of the reactivated cyanobacteria toward the mat surface, which led, together with a gradual increase in chlorophyll a, to a further increase in photosynthesis. We conclude that the response involving an increase in chlorophyll a and recovery of photosynthetic activity within minutes after rehydration is common for cyanobacteria from desiccated mats of both terrestrial and marine origin. However, the response of upward migration and its triggering factor appear to be mat-specific and likely linked to other factors.
    Citation
    Rapid Reactivation of Cyanobacterial Photosynthesis and Migration upon Rehydration of Desiccated Marine Microbial Mats 2015, 6 Frontiers in Microbiology
    Publisher
    Frontiers Media SA
    Journal
    Frontiers in Microbiology
    DOI
    10.3389/fmicb.2015.01472
    PubMed ID
    26733996
    Additional Links
    http://journal.frontiersin.org/article/10.3389/fmicb.2015.01472
    ae974a485f413a2113503eed53cd6c53
    10.3389/fmicb.2015.01472
    Scopus Count
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    Articles; Red Sea Research Center (RSRC)

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