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    Light supports cell-integrity and growth rates of taxonomically diverse coastal photoheterotrophs.

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    1462-2920.15158.pdf
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    Type
    Article
    Authors
    Arandia-Gorostidi, Nestor cc
    González, José M cc
    Huete-Stauffer, Tamara cc
    Ansari, Mohd Ikram cc
    Moran, Xose Anxelu G. cc
    Alonso-Sáez, Laura cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Marine Science Program
    Microbial oceanography Research Group
    Red Sea Research Center (RSRC)
    Water Desalination and Reuse Research Center (WDRC)
    Date
    2020-08-02
    Online Publication Date
    2020-08-02
    Print Publication Date
    2020-09
    Embargo End Date
    2021-07-10
    Submitted Date
    2019-05-23
    Permanent link to this record
    http://hdl.handle.net/10754/664249
    
    Metadata
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    Abstract
    Despite the widespread distribution of proteorhodopsin (PR)-containing bacteria in the oceans, the use of light-derived energy to promote bacterial growth has only been shown in a few bacterial isolates, and there is a paucity of data describing the metabolic effects of light on environmental photoheterotrophic taxa. Here, we assessed the effects of light on the taxonomic composition, cell integrity and growth responses of microbial communities in monthly incubations between spring and autumn under different environmental conditions. The photoheterotrophs expressing PR in situ were dominated by Pelagibacterales and SAR116 in July and November, while members of Euryarchaeota, Gammaproteobacteria and Bacteroidetes dominated the PR expression in spring. Cell-membrane integrity decreased under dark conditions throughout most of the assessment, with maximal effects in summer, under low-nutrient conditions. A positive effect of light on growth was observed in one incubation (out of nine), coinciding with a declining phytoplankton bloom. Light-enhanced growth was found in Gammaproteobacteria (Alteromonadales) and Bacteroidetes (Polaribacter and Tenacibaculum). Unexpectedly, some Pelagibacterales also exhibited higher growth rates under light conditions. We propose that the energy harvested by PRs helps to maintain cell viability in dominant coastal photoheterotrophic oligotrophs while promoting growth of some widespread taxa benefiting from the decline of phytoplankton blooms. This article is protected by copyright. All rights reserved.
    Citation
    Arandia-Gorostidi, N., González, J. M., Huete-Stauffer, T., Ansari, M. I., Morán, X. A. G., & Alonso-Sáez, L. (2020). Light supports cell-integrity and growth rates of taxonomically diverse coastal photoheterotrophs. Environmental Microbiology. doi:10.1111/1462-2920.15158
    Sponsors
    We are grateful to Basque Government for supporting N.A.G.’s Ph.D. fellowship the Spanish Ministry of Economy and Competitiveness (MINECO) for supporting L.A.S.’s Juan de la Cierva and Ramón y Cajal fellowship (RYC-2012-11404) and the COMITE project (CTM-2010–15840). The Spanish Ministry of Economy and Competitiveness also supported J.M.G project (CTM2016-80095-C2-2-R). We are very thankful to all the staff of the R/V “José de Rioja” for their help during the sampling collection and L. Díaz for her help during the experiments. We are also grateful to A. R. Bausch for English editing.
    Publisher
    Wiley
    Journal
    Environmental microbiology
    DOI
    10.1111/1462-2920.15158
    PubMed ID
    32643243
    Additional Links
    https://onlinelibrary.wiley.com/doi/abs/10.1111/1462-2920.15158
    ae974a485f413a2113503eed53cd6c53
    10.1111/1462-2920.15158
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program; Water Desalination and Reuse Research Center (WDRC)

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