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Marine Biology

, Volume 158, Issue 11, pp 2515–2526 | Cite as

Photoinhibition of Symbiodinium spp. within the reef corals Montastraea faveolata and Porites astreoides: implications for coral bleaching

  • Sebastian J. Hennige
  • Michael P. McGinley
  • Andréa G. Grottoli
  • Mark E. Warner
Original Paper

Abstract

It is speculated that differences in coral bleaching susceptibility may be influenced by the genotype of in hospite Symbiodinium and their differential responses to bleaching stressors. Photoinhibition of photosystem II (PSII), damage to the D1 (psbA) PSII reaction centre protein and production of reactive oxygen species by in hospite Symbiodinium are likely precursors of coral bleaching. In order to assess whether photorepair rates of in hospite Symbiodinium underlie the bleaching susceptibility of their hosts, photoinhibition (net and gross), photoprotection and photorepair rates were assessed in a bleaching-‘tolerant’ coral (P. astreoides) and a bleaching-‘sensitive’ coral (M. faveolata) using non-invasive fluorometric techniques and by blocking de novo synthesis of psbA. Previous studies using such techniques have demonstrated that in vitro Symbiodinium types ‘sensitive’ to bleaching stressors had reduced rates of photorepair relative to ‘tolerant’ Symbiodinum types. Our measurements demonstrated that Symbiodinium in the more bleaching tolerant P. astreoides had higher photorepair rates than Symbiodinium in M. faveolata. Higher repair rates in P. astreoides resulted in lower net photoinhibition relative to M. faveolata, where both corals exhibited similar susceptibility to photodamage (gross photoinhibition). Photoprotective mechanisms were observed in both corals; M. faveolata exhibited higher antennae-bed quenching than P. astreoides at low-light intensities, but at and above light-saturating intensities, which are different for each coral species, P. astreoides displayed more efficient non-photochemical quenching (Stern–Volmer quenching) of chlorophyll fluorescence than M. faveolata. Increased NPQ by P. astreoides at E/Ek ≥ 1 was not driven by antennae-bed quenching. The ability of in hospite Symbiodinium in P. astreoides to mitigate the effects of photoinhibition under high light conditions compared with Symbiodinium in M. faveolata, and their high repair capacity following photoinhibition, may be a key factor to consider in future bleaching studies and may underlie the relative bleaching tolerance of P. astreoides compared to M. faveolata.

Keywords

High Light Electron Transport Rate Coral Species Coral Bleaching PSII Reaction Centre 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors wish to thank Roberto Iglesias-Prieto, Susana Enríquez, Robin Smith and the staff of the Instituto de Ciencias del Mar y Limnologia, Universidad Nacional Autónoma de México for their generous time and logistical support. This work was supported by funding from the National Science Foundation (award 0825490 to A. Grottoli, and award 0825413 to M. Warner). All work undertaken in this study complied with the current laws of Mexico and the United States of America.

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Sebastian J. Hennige
    • 1
    • 2
  • Michael P. McGinley
    • 2
  • Andréa G. Grottoli
    • 3
  • Mark E. Warner
    • 2
  1. 1.Centre for Marine Biodiversity and BiotechnologyHeriot Watt UniversityEdinburghUK
  2. 2.College of Earth, Ocean and EnvironmentUniversity of DelawareLewesUSA
  3. 3.School of Earth SciencesOhio State UniversityColumbusUSA

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