Dimethylated sulfur production in batch cultures of Southern Ocean phytoplankton

Sheehan, CE; Petrou, K

Dimethylated sulfur production in batch cultures of Southern Ocean phytoplankton

Sheehan, CE Petrou, K

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Publisher:: Springer (part of Springer Nature)
Publication Type:: Journal Article
Citation:: Biogeochemistry: an international journal, 2020, 147, (1), pp. 53-69
Issue Date:: 2020-01-01

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Field	Value	Language
dc.contributor.author	Sheehan, CE
dc.contributor.author	Petrou, K https://orcid.org/0000-0002-2703-0694
dc.date.accessioned	2020-11-19T03:20:59Z
dc.date.available	2020-11-19T03:20:59Z
dc.date.issued	2020-01-01
dc.identifier.citation	Biogeochemistry: an international journal, 2020, 147, (1), pp. 53-69
dc.identifier.issn	0168-2563
dc.identifier.issn	1573-515X
dc.identifier.uri	http://hdl.handle.net/10453/144148
dc.description.abstract	© 2019, Springer Nature Switzerland AG. Dimethylsulfoniopropionate (DMSP) is a ubiquitous organic sulfur compound that underpins sulfur cycling in the marine environment and is the precursor to the climatically active gas dimethylsulfide (DMS). Modelling studies have identified the Southern Ocean as a DMS hot spot during summer, yet except for the bloom forming haptophyte Phaeocystis, little is known about sulfur production by other important members of the marine microbial community. Here, we measured DMSP concentrations and DMSP lyase activity (DLA), with corresponding carbon, nitrogen and Chl a content, in 15 species of Antarctic phototrophic phytoplankton (14 microalgae species and one cyanobacterium) and one phagotrophic flagellate. We found that 11 of the 16 species were able to produce DMSP and eight possess DLA. DMSP content ranged from 0.06 to 73 fmol cell−1 and estimated DMSP production rates ranged from 0.008 to 12.42 fmol cell−1 day−1. As expected, Phaeocystis was amongst the highest producers, however, contrary to expectation DMSP concentrations were high in several pennate diatom species, with intracellular concentrations between 1.85 and 46.6 mM. Here we present the first evidence that the cyanobacterium Synechococcus may be a DMSP producer, with the potential to contribute significantly to the DMSP pool. This study has provided the first analysis of DMSP production and DLA in a suite of phototrophic and phagotrophic species isolated from Antarctica, revealing the variability in DMSP concentrations across multiple strains and within genera and delivered new evidence for potential DLA in diatoms.
dc.language	English
dc.publisher	Springer (part of Springer Nature)
dc.relation.ispartof	Biogeochemistry: an international journal
dc.relation.isbasedon	10.1007/s10533-019-00628-8
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	info:eu-repo/semantics/openAccess
dc.rights	This is a post-peer-review, pre-copyedit version of an article published in Biogeochemistry: an international journal. The final authenticated version is available online at: https://dx.doi.org/10.1007/s10533-019-00628-8.	en_US
dc.subject	0399 Other Chemical Sciences, 0402 Geochemistry, 0502 Environmental Science and Management
dc.subject.classification	Agronomy & Agriculture
dc.title	Dimethylated sulfur production in batch cultures of Southern Ocean phytoplankton
dc.type	Journal Article
utslib.citation.volume	147
utslib.for	0399 Other Chemical Sciences
utslib.for	0402 Geochemistry
utslib.for	0502 Environmental Science and Management
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	open_access	*
pubs.consider-herdc	true
dc.date.updated	2020-11-19T03:20:55Z
pubs.issue	1
pubs.publication-status	Published
pubs.volume	147
utslib.citation.issue	1

Abstract:

© 2019, Springer Nature Switzerland AG. Dimethylsulfoniopropionate (DMSP) is a ubiquitous organic sulfur compound that underpins sulfur cycling in the marine environment and is the precursor to the climatically active gas dimethylsulfide (DMS). Modelling studies have identified the Southern Ocean as a DMS hot spot during summer, yet except for the bloom forming haptophyte Phaeocystis, little is known about sulfur production by other important members of the marine microbial community. Here, we measured DMSP concentrations and DMSP lyase activity (DLA), with corresponding carbon, nitrogen and Chl a content, in 15 species of Antarctic phototrophic phytoplankton (14 microalgae species and one cyanobacterium) and one phagotrophic flagellate. We found that 11 of the 16 species were able to produce DMSP and eight possess DLA. DMSP content ranged from 0.06 to 73 fmol cell−1 and estimated DMSP production rates ranged from 0.008 to 12.42 fmol cell−1 day−1. As expected, Phaeocystis was amongst the highest producers, however, contrary to expectation DMSP concentrations were high in several pennate diatom species, with intracellular concentrations between 1.85 and 46.6 mM. Here we present the first evidence that the cyanobacterium Synechococcus may be a DMSP producer, with the potential to contribute significantly to the DMSP pool. This study has provided the first analysis of DMSP production and DLA in a suite of phototrophic and phagotrophic species isolated from Antarctica, revealing the variability in DMSP concentrations across multiple strains and within genera and delivered new evidence for potential DLA in diatoms.

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