Please use this identifier to cite or link to this item: http://dx.doi.org/10.14279/depositonce-11904
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Main Title: Electron & Biomass Dynamics of Cyanothece Under Interacting Nitrogen & Carbon Limitations
Author(s): Rabouille, Sophie
Campbell, Douglas A.
Masuda, Takako
Zavřel, Tomáš
Bernát, Gábor
Polerecky, Lubos
Halsey, Kimberly
Eichner, Meri
Kotabová, Eva
Stephan, Susanne
Lukeš, Martin
Claquin, Pascal
Bonomi-Barufi, José
Lombardi, Ana Teresa
Červený, Jan
Suggett, David J.
Giordano, Mario
Kromkamp, Jacco C.
Prášil, Ondřej
Type: Article
Language Code: en
Abstract: Marine diazotrophs are a diverse group with key roles in biogeochemical fluxes linked to primary productivity. The unicellular, diazotrophic cyanobacterium Cyanothece is widely found in coastal, subtropical oceans. We analyze the consequences of diazotrophy on growth efficiency, compared to NO3–-supported growth in Cyanothece, to understand how cells cope with N2-fixation when they also have to face carbon limitation, which may transiently affect populations in coastal environments or during blooms of phytoplankton communities. When grown in obligate diazotrophy, cells face the double burden of a more ATP-demanding N-acquisition mode and additional metabolic losses imposed by the transient storage of reducing potential as carbohydrate, compared to a hypothetical N2 assimilation directly driven by photosynthetic electron transport. Further, this energetic burden imposed by N2-fixation could not be alleviated, despite the high irradiance level within the cultures, because photosynthesis was limited by the availability of dissolved inorganic carbon (DIC), and possibly by a constrained capacity for carbon storage. DIC limitation exacerbates the costs on growth imposed by nitrogen fixation. Therefore, the competitive efficiency of diazotrophs could be hindered in areas with insufficient renewal of dissolved gases and/or with intense phytoplankton biomass that both decrease available light energy and draw the DIC level down.
URI: https://depositonce.tu-berlin.de/handle/11303/13111
http://dx.doi.org/10.14279/depositonce-11904
Issue Date: 9-Apr-2021
Date Available: 18-May-2021
DDC Class: 570 Biowissenschaften; Biologie
Subject(s): Cyanothece
Crocosphaera subtropica
photosynthesis
light limitation
carbon limitation
nitrogen fixation
License: https://creativecommons.org/licenses/by/4.0/
Journal Title: Frontiers in Microbiology
Publisher: Frontiers
Publisher Place: Lausanne
Volume: 12
Article Number: 617802
Publisher DOI: 10.3389/fmicb.2021.617802
EISSN: 1664-302X
Appears in Collections:FG Angewandte Gewässerökologie » Publications

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