|
|||||
|
|
PSII activity and pigment dynamics of Symbiodinium in two Indo-Pacific corals exposed to short-term high-light stress |
|
| Authors: | Wiebke E Krämer Verena Schrameyer Ross Hill Peter J Ralph Kai Bischof |
| Institution: | 1. Department of Marine Botany, University of Bremen, Leobener Stra?e NW2, 28359, Bremen, Germany 3. Laboratorio de Fotobiología, Unidad Académica de Sistemas Arrecifales (Puerto Morelos), Instituto de Ciencias del Mar y Limnología, Universidad Nacional Autónoma de México, Cancún, Quintana Roo, Mexico 2. Plant Functional Biology and Climate Change Cluster, Department of Environmental Sciences, University of Technology, Sydney, NSW, Australia 4. Centre for Marine Bio-Innovation and Sydney Institute of Marine Science, School of Biological, Earth and Environmental Sciences, The University of New South Wales, Sydney, NSW, 2052, Australia |
| Abstract: | This study examined the capacity for photoprotection and repair of photo-inactivated photosystem II in the same Symbiodinium clade associated with two coexisting coral species during high-light stress in order to test for the modulation of the symbiont’s photobiological response by the coral host. After 4 days exposure to in situ irradiance, symbionts of the bleaching-sensitive Pocillopora damicornis showed rapid synthesis of photoprotective pigments (by 44 %) and strongly enhanced rates of xanthophyll cycling (by 446 %) while being insufficient to prevent photoinhibition (sustained loss in F v/F m at night) and loss of symbionts after 4 days. By contrast, Pavona decussata showed no significant changes in F v/F m, symbiont density or xanthophyll cycling. Given the association with the same Symbiodinium clade in both coral species, our findings suggest that symbionts in the two species examined may experience different in hospite light conditions as a result of different biometric properties of the coral host. |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ | |