Suggett, David J and Warner, Mark E and Smith, David J and Davey, Phillip and Hennige, Sebastian and Baker, Neil R (2008) PHOTOSYNTHESIS AND PRODUCTION OF HYDROGEN PEROXIDE BY <i>SYMBIODINIUM</i> (PYRRHOPHYTA) PHYLOTYPES WITH DIFFERENT THERMAL TOLERANCES<sup>1</sup>. Journal of Phycology, 44 (4). pp. 948-956. DOI https://doi.org/10.1111/j.1529-8817.2008.00537.x
Suggett, David J and Warner, Mark E and Smith, David J and Davey, Phillip and Hennige, Sebastian and Baker, Neil R (2008) PHOTOSYNTHESIS AND PRODUCTION OF HYDROGEN PEROXIDE BY <i>SYMBIODINIUM</i> (PYRRHOPHYTA) PHYLOTYPES WITH DIFFERENT THERMAL TOLERANCES<sup>1</sup>. Journal of Phycology, 44 (4). pp. 948-956. DOI https://doi.org/10.1111/j.1529-8817.2008.00537.x
Suggett, David J and Warner, Mark E and Smith, David J and Davey, Phillip and Hennige, Sebastian and Baker, Neil R (2008) PHOTOSYNTHESIS AND PRODUCTION OF HYDROGEN PEROXIDE BY <i>SYMBIODINIUM</i> (PYRRHOPHYTA) PHYLOTYPES WITH DIFFERENT THERMAL TOLERANCES<sup>1</sup>. Journal of Phycology, 44 (4). pp. 948-956. DOI https://doi.org/10.1111/j.1529-8817.2008.00537.x
Abstract
<jats:p>Occurrences whereby cnidaria lose their symbiotic dinoflagellate microalgae (<jats:italic>Symbiodinium</jats:italic> 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 <jats:italic>Symbiodinium</jats:italic> phylotypes from effectively dissipating absorbed excitation energy that is otherwise used for photochemistry. Here, we examined photosynthetic characteristics and hydrogen peroxide (H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub>) production, a possible signal involved in bleaching, from two <jats:italic>Symbiodinium</jats:italic> types (a thermally “tolerant” A1 and “sensitive” B1) representative of cnidaria–<jats:italic>Symbiodinium</jats:italic> 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<jats:sub>2</jats:sub> 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 O<jats:sub>2</jats:sub> consumption but not the amount of H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub> produced; in contrast, type B1 increased the amount of H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub> produced without an increase in light‐driven O<jats:sub>2</jats:sub> consumption. Therefore, our results are consistent with previous suggestions that the thermal tolerance of <jats:italic>Symbiodinium</jats:italic> is related to adaptive constraints associated with photosynthesis and that sensitive phylotypes are more prone to H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub> production. Understanding these adaptive differences in the genus <jats:italic>Symbiodinium</jats:italic> will be crucial if we are to interpret the response of symbiotic associations, including reef‐building corals, to environmental change.</jats:p>
Item Type: | Article |
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Uncontrolled Keywords: | bleaching; hydrogen peroxide; Mehler reaction; oxygen evolution; photosystem II; reactive oxygen species; Symbiodinium |
Subjects: | Q Science > QH Natural history > QH301 Biology |
Divisions: | Faculty of Science and Health Faculty of Science and Health > Life Sciences, School of |
SWORD Depositor: | Unnamed user with email elements@essex.ac.uk |
Depositing User: | Unnamed user with email elements@essex.ac.uk |
Date Deposited: | 06 Oct 2011 14:54 |
Last Modified: | 30 Oct 2024 20:07 |
URI: | http://repository.essex.ac.uk/id/eprint/764 |