Increased reliance upon photosystem II repair following acclimation to high-light by coral-dinoflagellate symbioses

Jeans, Jennifer, Campbell, Douglas A., and Hoogenboom, Mia O. (2013) Increased reliance upon photosystem II repair following acclimation to high-light by coral-dinoflagellate symbioses. Photosynthesis Research, 118 (3). pp. 219-229.

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Changing light environments force photoautotroph cells, including coral symbionts, to acclimate to maintain photosynthesis. Photosystem II (PSII) is subjected to photoinactivation at a rate proportional to the incident light, and cells must adjust their rates of protein repair to counter this photoinactivation. We examined PSII function in the coral symbiont Symbiodinium to determine the effect of photoacclimation on their capacity for PSII repair. Colonies of the coral Stylophora pistillata were collected from moderate light environments on the Lizard Island reef (Queensland, Australia) and transported to a local field station, where they were assigned to lower or higher light regimes and allowed to acclimate for 2 weeks. Following this photoacclimation period, the low-light acclimated corals showed greater symbiont density, higher chlorophyll per symbiont cell, and higher photosystem II protein than high-light acclimated corals did. Subsequently, we treated the corals with lincomycin, an inhibitor of chloroplastic protein synthesis, and exposed them to a high-light treatment to separate the effect of de novo protein synthesis in PSII repair from intrinsic susceptibility to photoinactivation. Low-light acclimated corals showed a sharp initial drop in PSII function but inhibition of PSII repair provoked only a modest additional drop in PSII function, compared to uninhibited corals. In high-light acclimated corals inhibition of PSII repair provoked a larger drop in PSII function, compared to uninhibited high-light corals. The greater lincomycin effects in the corals pre-acclimated to high-light show that high-light leads to an increased reliance on the PSII repair cycle.

Item ID: 30627
Item Type: Article (Research - C1)
ISSN: 1573-5079
Keywords: coral, photosystem II repair, stylophora, symbiodinium
Funders: Natural Sciences and Engineering Research Council of Canada (NSERC), James Cook University (JCU)
Date Deposited: 18 Dec 2013 05:28
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060203 Ecological Physiology @ 70%
05 ENVIRONMENTAL SCIENCES > 0501 Ecological Applications > 050101 Ecological Impacts of Climate Change @ 30%
SEO Codes: 96 ENVIRONMENT > 9603 Climate and Climate Change > 960305 Ecosystem Adaptation to Climate Change @ 40%
96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 60%
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