1

People and ecosystems

Understanding of the links between coral reef ecosystems, the goods and services they provide to people, and the wellbeing of human societies.

2

Ecosystem dynamics: past, present and future

Examining the multi-scale dynamics of reefs, from population dynamics to macroevolution

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Responding to a changing world

Advancing the fundamental understanding of the key processes underpinning reef resilience.

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Coral Reef Studies

ARC Centre of Excellence for Coral Reef Studies
James Cook University Townsville
Queensland 4811 Australia

Phone: 61 7 4781 4000
Email: info@coralcoe.org.au

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Event

Molecular and physiological studies of inorganic carbon utilization in the Scleractinian coral Stylophora pistillata (Esper, 1797).

When

3.00pm, Tuesday 19 July 2011

location
Townsville - Sir George Fisher Building Conference Room #114 (DB32 upstairs)
Presenter
Anthony Bertucci, Centre Scientifique de Monaco

Abstract:

Coral reefs edification is based on the formation of a calcium carbonate skeleton by scleractinian corals ad on the symbiotic association that many of them establish with photosynthetic Dinoflagellates from the genus Symbiodinium. Both processes involve the transport and the use of inorganic carbon (Ci) coming from seawater for photosynthesis, and from animal metabolism for calcification. This work focused on the molecular and physiological study of poorly known mechanisms that allow the utilization of Ci in corals.

Previous physiological studies suggested different strategies in the Ci uptake between in hospite and free-living Symbiodinium. We cloned a P-type H+- ATPase gene involved in algal CO2-Concentrating Mechanisms. This gene is the first to show a symbiosis-dependent expression in the symbiont.

Carbonic Anhydrases (CAs) are key enzymes in coral physiology. This work allowed the cloning and the localization of two CAs. The first one is involved in calcification while the second one is likely to play a role in the intracellular pH regulation and the CO2 / HCO3- equilibrium. A pharmacological study of these two enzymes identified inhibitor and activator compounds that have been then used in physiology experiments. This last approach may represent a new and more accurate way of studying the role of CAs in coral physiology. This work is currently complemented by the characterization of new CA isoforms and other actors of Ci transport in scleractinian corals.

Key words: Stylophora pistillata; inorganic carbon; biomineralization; CO2- concentrating-mechanism; Carbonic anhydrase.

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Coral Reef Studies

ARC Centre of Excellence for Coral Reef Studies
James Cook University Townsville
Queensland 4811 Australia

Phone: 61 7 4781 4000
Email: info@coralcoe.org.au