The University of Southampton
University of Southampton Institutional Repository

Desert dust as a source of iron to the globally important diazotroph Trichodesmium

Desert dust as a source of iron to the globally important diazotroph Trichodesmium
Desert dust as a source of iron to the globally important diazotroph Trichodesmium
The marine cyanobacterium Trichodesmium sp. accounts for approximately half of the annual ‘new’ nitrogen introduced to the global ocean but its biogeography and activity is often limited by the availability of iron (Fe). A major source of Fe to the open ocean is Aeolian dust deposition in which Fe is largely comprised of particles with reduced bioavailability over soluble forms of Fe. We report that Trichodesmium erythraeum IMS101 has improved growth rate and photosynthetic physiology and down-regulates Fe-stress biomarker genes when cells are grown in the direct vicinity of, rather than physically separated from, Saharan dust particles as the sole source of Fe. These findings suggest that availability of non-soluble forms of dust-associated Fe may depend on cell contact. Transcriptomic analysis further reveals unique profiles of gene expression in all tested conditions, implying that Trichodesmium has distinct molecular signatures related to acquisition of Fe from different sources. Trichodesmium thus appears to be capable of employing specific mechanisms to access Fe from complex sources in oceanic systems, helping to explain its role as a key microbe in global biogeochemical cycles.
1664-302X
Polyviou, Despo
7fcaf51c-0615-4967-a180-f5405f7b8070
Baylay, Alison J.
08ea69f8-9910-4c8b-86a9-602e45b8a44e
Hitchcock, Andrew
e64be89f-ad65-45c2-bab0-4bc42c9cefbe
Robidart, Julie
a9b8d49c-c1e3-4a3b-a53c-685a0f2c7f93
Moore, C.M.
7ec80b7b-bedc-4dd5-8924-0f5d01927b12
Bibby, Thomas
e04ea079-dd90-4ead-9840-00882de27ebd
Polyviou, Despo
7fcaf51c-0615-4967-a180-f5405f7b8070
Baylay, Alison J.
08ea69f8-9910-4c8b-86a9-602e45b8a44e
Hitchcock, Andrew
e64be89f-ad65-45c2-bab0-4bc42c9cefbe
Robidart, Julie
a9b8d49c-c1e3-4a3b-a53c-685a0f2c7f93
Moore, C.M.
7ec80b7b-bedc-4dd5-8924-0f5d01927b12
Bibby, Thomas
e04ea079-dd90-4ead-9840-00882de27ebd

Polyviou, Despo, Baylay, Alison J., Hitchcock, Andrew, Robidart, Julie, Moore, C.M. and Bibby, Thomas (2018) Desert dust as a source of iron to the globally important diazotroph Trichodesmium. Frontiers in Microbiology, 8. (doi: 10.3389/fmicb.2017.02683).

Record type: Article

Abstract

The marine cyanobacterium Trichodesmium sp. accounts for approximately half of the annual ‘new’ nitrogen introduced to the global ocean but its biogeography and activity is often limited by the availability of iron (Fe). A major source of Fe to the open ocean is Aeolian dust deposition in which Fe is largely comprised of particles with reduced bioavailability over soluble forms of Fe. We report that Trichodesmium erythraeum IMS101 has improved growth rate and photosynthetic physiology and down-regulates Fe-stress biomarker genes when cells are grown in the direct vicinity of, rather than physically separated from, Saharan dust particles as the sole source of Fe. These findings suggest that availability of non-soluble forms of dust-associated Fe may depend on cell contact. Transcriptomic analysis further reveals unique profiles of gene expression in all tested conditions, implying that Trichodesmium has distinct molecular signatures related to acquisition of Fe from different sources. Trichodesmium thus appears to be capable of employing specific mechanisms to access Fe from complex sources in oceanic systems, helping to explain its role as a key microbe in global biogeochemical cycles.

Text fmicb-08-02683 - Version of Record
Available under License Creative Commons Attribution.
Download (2MB)

More information

Accepted/In Press date: 22 December 2017
e-pub ahead of print date: 18 January 2018

Identifiers

Local EPrints ID: 417225
URI: https://eprints.soton.ac.uk/id/eprint/417225
DOI: doi: 10.3389/fmicb.2017.02683
ISSN: 1664-302X
PURE UUID: 6882b605-e6a1-404e-8ca0-cdf233f6d68e

Catalogue record

Date deposited: 26 Jan 2018 17:30
Last modified: 02 Feb 2018 17:30

Export record

Altmetrics

Contributors

Author: Despo Polyviou
Author: Andrew Hitchcock
Author: Julie Robidart
Author: C.M. Moore
Author: Thomas Bibby

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of https://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×