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Dynamics of extracellular superoxide production by Trichodesmium colonies from the Sargasso Sea

Dynamics of extracellular superoxide production by Trichodesmium colonies from the Sargasso Sea
Dynamics of extracellular superoxide production by Trichodesmium colonies from the Sargasso Sea
Reactive oxygen species (ROS) are key players in the health and biogeochemistry of the ocean and its inhabitants. The vital contribution of microorganisms to marine ROS levels, particularly superoxide, has only recently come to light, and thus the specific biological sources and pathways involved in ROS production are largely unknown. To better understand the biogenic controls on ROS levels in tropical oligotrophic systems, we determined rates of superoxide production under various conditions by natural populations of the nitrogen-fixing diazotroph Trichodesmium obtained from various surface waters in the Sargasso Sea. Trichodesmium colonies collected from eight different stations all produced extracellular superoxide at high rates in both the dark and light. Colony density and light had a variable impact on extracellular superoxide production depending on the morphology of the Trichodesmium colonies. Raft morphotypes showed a rapid increase in superoxide production in response to even low levels of light, which was not observed for puff colonies. In contrast, superoxide production rates per colony decreased with increasing colony density for puff morphotypes but not for rafts. These findings point to Trichodesmium as a likely key source of ROS to the surface oligotrophic ocean. The physiological and/or ecological factors underpinning morphology-dependent controls on superoxide production need to be unveiled to better understand and predict superoxide production by Trichodesmium and ROS dynamics within marine systems.
0024-3590
1188-1200
Hansel, C. M.
1f02b79d-ccaa-48a8-b1ed-a1962d902458
Buchwald, C.
2f175f54-db54-4f76-b9b4-419f79200eb6
Diaza, J.M.
eef732a1-9bbc-498e-a2e6-30e48be9b6d7
Ossolinski, J.E.
b6e572c1-241b-45f1-8e87-b52e4a1f80e5
Dyhrman, S.T.
27f006d4-c4aa-4bc8-a88f-bee399609628
Van Mooy, B.A.S.
03fc8359-5d9a-4594-91da-b00324706424
Polyviou, Despo
7fcaf51c-0615-4967-a180-f5405f7b8070
Hansel, C. M.
1f02b79d-ccaa-48a8-b1ed-a1962d902458
Buchwald, C.
2f175f54-db54-4f76-b9b4-419f79200eb6
Diaza, J.M.
eef732a1-9bbc-498e-a2e6-30e48be9b6d7
Ossolinski, J.E.
b6e572c1-241b-45f1-8e87-b52e4a1f80e5
Dyhrman, S.T.
27f006d4-c4aa-4bc8-a88f-bee399609628
Van Mooy, B.A.S.
03fc8359-5d9a-4594-91da-b00324706424
Polyviou, Despo
7fcaf51c-0615-4967-a180-f5405f7b8070

Hansel, C. M., Buchwald, C., Diaza, J.M., Ossolinski, J.E., Dyhrman, S.T., Van Mooy, B.A.S. and Polyviou, Despo (2016) Dynamics of extracellular superoxide production by Trichodesmium colonies from the Sargasso Sea. Limnology and Oceanography, 61 (4), 1188-1200. (doi:10.1002/lno.10266).

Record type: Article

Abstract

Reactive oxygen species (ROS) are key players in the health and biogeochemistry of the ocean and its inhabitants. The vital contribution of microorganisms to marine ROS levels, particularly superoxide, has only recently come to light, and thus the specific biological sources and pathways involved in ROS production are largely unknown. To better understand the biogenic controls on ROS levels in tropical oligotrophic systems, we determined rates of superoxide production under various conditions by natural populations of the nitrogen-fixing diazotroph Trichodesmium obtained from various surface waters in the Sargasso Sea. Trichodesmium colonies collected from eight different stations all produced extracellular superoxide at high rates in both the dark and light. Colony density and light had a variable impact on extracellular superoxide production depending on the morphology of the Trichodesmium colonies. Raft morphotypes showed a rapid increase in superoxide production in response to even low levels of light, which was not observed for puff colonies. In contrast, superoxide production rates per colony decreased with increasing colony density for puff morphotypes but not for rafts. These findings point to Trichodesmium as a likely key source of ROS to the surface oligotrophic ocean. The physiological and/or ecological factors underpinning morphology-dependent controls on superoxide production need to be unveiled to better understand and predict superoxide production by Trichodesmium and ROS dynamics within marine systems.

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More information

Accepted/In Press date: 30 December 2015
e-pub ahead of print date: 12 May 2016
Published date: 12 May 2016
Organisations: Ocean and Earth Science

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Local EPrints ID: 394377
URI: http://eprints.soton.ac.uk/id/eprint/394377
ISSN: 0024-3590
PURE UUID: 11fa3254-609c-4b10-881a-0646c28f92b6

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Date deposited: 13 May 2016 14:14
Last modified: 09 Jan 2022 01:17

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Contributors

Author: C. M. Hansel
Author: C. Buchwald
Author: J.M. Diaza
Author: J.E. Ossolinski
Author: S.T. Dyhrman
Author: B.A.S. Van Mooy
Author: Despo Polyviou

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