Article (Scientific journals)
Dark aerobic sulfide oxidation by anoxygenic phototrophs in anoxic waters of lake Cadagno
Sengupta, Anupam
2019In Environmental Microbiology
Peer Reviewed verified by ORBi
 

Files


Full Text
Dark aerobic sulfide oxidation by anoxygenic phototrophs in the anoxic waters of Lake Cadagno.pdf
Author preprint (1.58 MB)
Download

All documents in ORBilu are protected by a user license.

Send to



Details



Abstract :
[en] Anoxygenic phototrophic sulfide oxidation by green and purple sulfur bacteria (PSB) plays a key role in sulfide removal from anoxic shallow sediments and stratified waters. Although some PSB can also oxidize sulfide with nitrate and oxygen, little is known about the prevalence of this chemolithotrophic lifestyle in the environment. In this study, we investigated the role of these phototrophs in light‐independent sulfide removal in the chemocline of Lake Cadagno. Our temporally resolved, high‐resolution chemical profiles indicated that dark sulfide oxidation was coupled to high oxygen consumption rates of ~9 μM O2·h‐1. Single‐cell analyses of lake water incubated with 13CO2 in the dark revealed that Chromatium okenii was to a large extent responsible for aerobic sulfide oxidation and it accounted for up to 40 % of total dark carbon fixation. The genome of Chr. okenii reconstructed from the Lake Cadagno metagenome confirms its capacity for microaerophilic growth and provides further insights into its metabolic capabilities. Moreover, our genomic and single‐cell data indicated that other PSB grow microaerobically in these apparently anoxic waters. Altogether, our observations suggest that aerobic respiration may not only play an underappreciated role in anoxic environments, but also that organisms typically considered strict anaerobes may be involved.
Disciplines :
Life sciences: Multidisciplinary, general & others
Author, co-author :
Sengupta, Anupam  ;  University of Luxembourg > Faculty of Science, Technology and Communication (FSTC) > Physics and Materials Science Research Unit
External co-authors :
yes
Language :
English
Title :
Dark aerobic sulfide oxidation by anoxygenic phototrophs in anoxic waters of lake Cadagno
Publication date :
28 January 2019
Journal title :
Environmental Microbiology
ISSN :
1462-2920
Publisher :
Blackwell, Oxford, United Kingdom
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBilu :
since 21 February 2019

Statistics


Number of views
132 (16 by Unilu)
Number of downloads
90 (5 by Unilu)

Bibliography


Similar publications



Contact ORBilu