Host pigments: Potential facilitators of photosynthesis in coral symbioses

Dove, Sophie G., Lovell, Carli, Fine, Maoz, Deckenback, Jeffrey, Hoegh-Guldberg, Ove, Iglesias-Prieto, Roberto and Anthony, Kenneth R.N. (2008) Host pigments: Potential facilitators of photosynthesis in coral symbioses. Plant, Cell and Environment, 31 11: 1523-1533. doi:10.1111/j.1365-3040.2008.01852.x


Author Dove, Sophie G.
Lovell, Carli
Fine, Maoz
Deckenback, Jeffrey
Hoegh-Guldberg, Ove
Iglesias-Prieto, Roberto
Anthony, Kenneth R.N.
Title Host pigments: Potential facilitators of photosynthesis in coral symbioses
Journal name Plant, Cell and Environment   Check publisher's open access policy
ISSN 0140-7791
1365-3040
Publication date 2008-11-01
Year available 2008
Sub-type Article (original research)
DOI 10.1111/j.1365-3040.2008.01852.x
Open Access Status Not yet assessed
Volume 31
Issue 11
Start page 1523
End page 1533
Total pages 11
Editor Keith Mott
Place of publication Oxford, United Kingdom
Publisher Blackwell Publishing
Language eng
Subject C1
960808 Marine Flora, Fauna and Biodiversity
060808 Invertebrate Biology
060203 Ecological Physiology
060705 Plant Physiology
Abstract Reef-building corals occur as a range of colour morphs because of varying types and concentrations of pigments within the host tissues, but little is known about their physiological or ecological significance. Here, we examined whether specific host pigments act as an alternative mechanism for photoacclimation in the coral holobiont. We used the coral Montipora monasteriata (Forskal 1775) as a case study because it occurs in multiple colour morphs (tan, blue, brown, green and red) within varying light-habitat distributions. We demonstrated that two of the non-fluorescent host pigments are responsive to changes in external irradiance, with some host pigments up-regulating in response to elevated irradiance. This appeared to facilitate the retention of antennal chlorophyll by endosymbionts and hence, photosynthetic capacity. Specifically, net P(max) Chl a(-1) correlated strongly with the concentration of an orange-absorbing non-fluorescent pigment (CP-580). This had major implications for the energetics of bleached blue-pigmented (CP-580) colonies that maintained net P(max) cm(-2) by increasing P(max) Chl a(-1). The data suggested that blue morphs can bleach, decreasing their symbiont populations by an order of magnitude without compromising symbiont or coral health.
Formatted abstract
Reef-building corals occur as a range of colour morphs because of varying types and concentrations of pigments within the host tissues, but little is known about their physiological or ecological significance. Here, we examined whether specific host pigments act as an alternative mechanism for photoacclimation in the coral holobiont. We used the coral Montipora monasteriata (Forskål 1775) as a case study because it occurs in multiple colour morphs (tan, blue, brown, green and red) within varying light-habitat distributions. We demonstrated that two of the nonfluorescent host pigments are responsive to changes in external irradiance, with some host pigments up-regulating in response to elevated irradiance. This appeared to facilitate the retention of antennal chlorophyll by endosymbionts and hence, photosynthetic capacity. Specifically, net Pmax Chl a-1 correlated strongly with the concentration of an orange-absorbing non-fluorescent pigment (CP-580). This had major implications for the energetics of bleached bluepigmented (CP-580) colonies that maintained net Pmax cm-2 by increasing Pmax Chl a-1. The data suggested that blue morphs can bleach, decreasing their symbiont populations by an order of magnitude without compromising symbiont or coral health.
Keyword All-protein chromophore
Bleaching
Dinoflagellate
Host Pigments
Photoacclimation
Photosynthesis
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Wed, 15 Apr 2009, 03:52:57 EST by Peter Fogarty on behalf of Centre for Marine Studies