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    Distinct dissolved organic matter sources induce rapid transcriptional responses in coexisting populations of Prochlorococcus, Pelagibacter and the OM60 clade

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    Sharma_Becker_EM_revised_MS_resubmitted.pdf (1.433Mb)
    Date
    2013-07
    Author
    Sharma, Adrian K.  Concept link
    Becker, Jamie W.  Concept link
    Ottesen, Elizabeth A.  Concept link
    Bryant, Jessica A.  Concept link
    Duhamel, Solange  Concept link
    Karl, David M.  Concept link
    Cordero, Otto X.  Concept link
    Repeta, Daniel J.  Concept link
    DeLong, Edward F.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6931
    As published
    https://doi.org/10.1111/1462-2920.12254
    Abstract
    A considerable fraction of the Earth's organic carbon exists in dissolved form in seawater. To investigate the roles of planktonic marine microbes in the biogeochemical cycling of this dissolved organic matter (DOM), we performed controlled seawater incubation experiments and followed the responses of an oligotrophic surface water microbial assemblage to perturbations with DOM derived from an axenic culture of Prochlorococcus, or high-molecular weight DOM concentrated from nearby surface waters. The rapid transcriptional responses of both Prochlorococcus and Pelagibacter populations suggested the utilization of organic nitrogen compounds common to both DOM treatments. Along with these responses, both populations demonstrated decreases in gene transcripts associated with nitrogen stress, including those involved in ammonium acquisition. In contrast, responses from low abundance organisms of the NOR5/OM60 gammaproteobacteria were observed later in the experiment, and included elevated levels of gene transcripts associated with polysaccharide uptake and oxidation. In total, these results suggest that numerically dominant oligotrophic microbes rapidly acquire nitrogen from commonly available organic sources, and also point to an important role for carbohydrates found within the DOM pool for sustaining the less abundant microorganisms in these oligotrophic systems.
    Description
    Author Posting. © The Author(s), 2013. This is the author's version of the work. It is posted here by permission of John Wiley & Sons for personal use, not for redistribution. The definitive version was published in Environmental Microbiology 16 (2014): 2815-2830, doi:10.1111/1462-2920.12254.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Preprint: Sharma, Adrian K., Becker, Jamie W., Ottesen, Elizabeth A., Bryant, Jessica A., Duhamel, Solange, Karl, David M., Cordero, Otto X., Repeta, Daniel J., DeLong, Edward F., "Distinct dissolved organic matter sources induce rapid transcriptional responses in coexisting populations of Prochlorococcus, Pelagibacter and the OM60 clade", 2013-07, https://doi.org/10.1111/1462-2920.12254, https://hdl.handle.net/1912/6931
     
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