Photosynthesis and production of hydrogen peroxide by Symbiodinium (Pyrrhophyta) phylotypes with different thermal tolerances

Suggett, DJ; Warner, ME; Smith, DJ; Davey, P; Hennige, S; Baker, NR

Photosynthesis and production of hydrogen peroxide by Symbiodinium (Pyrrhophyta) phylotypes with different thermal tolerances

Suggett, DJ

Warner, ME Smith, DJ Davey, P Hennige, S Baker, NR

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Publication Type:: Journal Article
Citation:: Journal of Phycology, 2008, 44 (4), pp. 948 - 956
Issue Date:: 2008-08-01

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Field	Value	Language
dc.contributor.author	Suggett, DJ https://orcid.org/0000-0001-5326-2520	en_US
dc.contributor.author	Warner, ME	en_US
dc.contributor.author	Smith, DJ	en_US
dc.contributor.author	Davey, P	en_US
dc.contributor.author	Hennige, S	en_US
dc.contributor.author	Baker, NR	en_US
dc.date.issued	2008-08-01	en_US
dc.identifier.citation	Journal of Phycology, 2008, 44 (4), pp. 948 - 956	en_US
dc.identifier.issn	0022-3646	en_US
dc.identifier.uri	http://hdl.handle.net/10453/28765
dc.description.abstract	Occurrences whereby cnidaria lose their symbiotic dinoflagellate microalgae (Symbiodinium spp.) are increasing in frequency and intensity. These so-called bleaching events are most often related to an increase in water temperature, which is thought to limit certain Symbiodinium phylotypes from effectively dissipating absorbed excitation energy that is otherwise used for photochemistry. Here, we examined photosynthetic characteristics and hydrogen peroxide (H2O2) production, a possible signal involved in bleaching, from two Symbiodinium types (a thermally "tolerant" A1 and "sensitive" B1) representative of cnidaria-Symbiodinium symbioses of reef-building Caribbean corals. Under steady-state growth at 26°C, a higher efficiency of PSII photochemistry, rate of electron turnover, and rate of O 2 production were observed for type A1 than for B1. The two types responded very differently to a period of elevated temperature (32°C): type A1 increased light-driven O2 consumption but not the amount of H 2O2 produced; in contrast, type B1 increased the amount of H2O2 produced without an increase in light-driven O 2 consumption. Therefore, our results are consistent with previous suggestions that the thermal tolerance of Symbiodinium is related to adaptive constraints associated with photosynthesis and that sensitive phylotypes are more prone to H2O2 production. Understanding these adaptive differences in the genus Symbiodinium will be crucial if we are to interpret the response of symbiotic associations, including reef-building corals, to environmental change. © 2008 Phycological Society of America.	en_US
dc.relation.ispartof	Journal of Phycology	en_US
dc.relation.isbasedon	10.1111/j.1529-8817.2008.00537.x	en_US
dc.subject.classification	Marine Biology & Hydrobiology	en_US
dc.title	Photosynthesis and production of hydrogen peroxide by Symbiodinium (Pyrrhophyta) phylotypes with different thermal tolerances	en_US
dc.type	Journal Article
utslib.citation.volume	4	en_US
utslib.citation.volume	44	en_US
utslib.for	0607 Plant Biology	en_US
utslib.for	0704 Fisheries Sciences	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Strength - C3 - Climate Change Cluster
utslib.copyright.status	closed_access
pubs.issue	4	en_US
pubs.publication-status	Published	en_US
pubs.volume	44	en_US

Abstract:

Occurrences whereby cnidaria lose their symbiotic dinoflagellate microalgae (Symbiodinium spp.) are increasing in frequency and intensity. These so-called bleaching events are most often related to an increase in water temperature, which is thought to limit certain Symbiodinium phylotypes from effectively dissipating absorbed excitation energy that is otherwise used for photochemistry. Here, we examined photosynthetic characteristics and hydrogen peroxide (H2O2) production, a possible signal involved in bleaching, from two Symbiodinium types (a thermally "tolerant" A1 and "sensitive" B1) representative of cnidaria-Symbiodinium symbioses of reef-building Caribbean corals. Under steady-state growth at 26°C, a higher efficiency of PSII photochemistry, rate of electron turnover, and rate of O 2 production were observed for type A1 than for B1. The two types responded very differently to a period of elevated temperature (32°C): type A1 increased light-driven O2 consumption but not the amount of H 2O2 produced; in contrast, type B1 increased the amount of H2O2 produced without an increase in light-driven O 2 consumption. Therefore, our results are consistent with previous suggestions that the thermal tolerance of Symbiodinium is related to adaptive constraints associated with photosynthesis and that sensitive phylotypes are more prone to H2O2 production. Understanding these adaptive differences in the genus Symbiodinium will be crucial if we are to interpret the response of symbiotic associations, including reef-building corals, to environmental change. © 2008 Phycological Society of America.

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http://hdl.handle.net/10453/28765