Brading, Patrick and Warner, Mark E and Smith, David J and Suggett, David J (2013) Contrasting modes of inorganic carbon acquisition amongst <i>Symbiodinium</i> (Dinophyceae) phylotypes. New Phytologist, 200 (2). pp. 432-442. DOI https://doi.org/10.1111/nph.12379
Brading, Patrick and Warner, Mark E and Smith, David J and Suggett, David J (2013) Contrasting modes of inorganic carbon acquisition amongst <i>Symbiodinium</i> (Dinophyceae) phylotypes. New Phytologist, 200 (2). pp. 432-442. DOI https://doi.org/10.1111/nph.12379
Brading, Patrick and Warner, Mark E and Smith, David J and Suggett, David J (2013) Contrasting modes of inorganic carbon acquisition amongst <i>Symbiodinium</i> (Dinophyceae) phylotypes. New Phytologist, 200 (2). pp. 432-442. DOI https://doi.org/10.1111/nph.12379
Abstract
<jats:title>Summary</jats:title><jats:p> <jats:list list-type="bullet"> <jats:list-item><jats:p>Growing concerns over ocean acidification have highlighted the need to critically understand inorganic carbon acquisition and utilization in marine microalgae. Here, we contrast these characteristics for the first time between two genetically distinct dinoflagellate species of the genus <jats:italic>Symbiodinium</jats:italic> (phylotypes A13 and A20) that live in symbiosis with reef‐forming corals.</jats:p></jats:list-item> <jats:list-item><jats:p>Both phylotypes were grown in continuous cultures under identical environmental conditions. Rubisco was measured using quantitative Western blots, and radioisotopic <jats:sup>14</jats:sup>C uptake was used to characterize light‐ and total carbon dioxide (TCO<jats:sub>2</jats:sub>)‐dependent carbon fixation, as well as inorganic carbon species preference and external carbonic anhydrase activity.</jats:p></jats:list-item> <jats:list-item><jats:p>A13 and A20 exhibited similar rates of carbon fixation despite cellular concentrations of Rubisco being approximately four‐fold greater in A13. The uptake of CO<jats:sub>2</jats:sub> over <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/nph12379-math-0001.gif" xlink:title="urn:x-wiley:0028646X:media:nph12379:nph12379-math-0001" /> was found to support the majority of carbon fixation in both phylotypes. However, A20 was also able to indirectly utilize <jats:inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="graphic/nph12379-math-0002.gif" xlink:title="urn:x-wiley:0028646X:media:nph12379:nph12379-math-0002" /> by first converting it to CO<jats:sub>2</jats:sub> via external carbonic anhydrase.</jats:p></jats:list-item> <jats:list-item><jats:p>These results show that adaptive differences in inorganic carbon acquisition have evolved within the <jats:italic>Symbiodinium</jats:italic> genus, which thus carries fundamental implications as to how this functionally key genus will respond to ocean acidification, but could also represent a key trait factor that influences their productivity when <jats:italic>in hospite</jats:italic> of their coral hosts.</jats:p></jats:list-item> </jats:list> </jats:p>
Item Type: | Article |
---|---|
Uncontrolled Keywords: | carbon acquisition; carbon-concentrating mechanism (CCM); dinoflagellate; microalgae; ocean acidification; 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: | 07 Nov 2013 16:43 |
Last Modified: | 30 Oct 2024 20:12 |
URI: | http://repository.essex.ac.uk/id/eprint/8297 |