Integral Light-Harvesting Complex Expression In Symbiodinium Within The Coral Acropora aspera Under Thermal Stress
| Autor: | William Leggat, Sarah L. Gierz, Benjamin R. Gordon |
|---|---|
| Rok vydání: | 2015 |
| Předmět: |
0106 biological sciences
0301 basic medicine Hot Temperature Coral bleaching Coral Light-Harvesting Protein Complexes 01 natural sciences Article Acropora aspera Light-harvesting complex 03 medical and health sciences Symbiodinium chemistry.chemical_compound Stress Physiological Anthozoa Botany Animals Multidisciplinary biology 010604 marine biology & hydrobiology Gene Expression Profiling fungi Dinoflagellate biology.organism_classification 030104 developmental biology chemistry Gene Expression Regulation Chlorophyll Dinoflagellida |
| Zdroj: | Scientific Reports |
| ISSN: | 2045-2322 |
| Popis: | Coral reef success is largely dependent on the symbiosis between coral hosts and dinoflagellate symbionts belonging to the genus Symbiodinium. Elevated temperatures can result in the expulsion of Symbiodinium or loss of their photosynthetic pigments and is known as coral bleaching. It has been postulated that the expression of light-harvesting protein complexes (LHCs), which bind chlorophylls (chl) and carotenoids, are important in photobleaching. This study explored the effect a sixteen-day thermal stress (increasing daily from 25–34 °C) on integral LHC (chlorophyll a-chlorophyll c2-peridinin protein complex (acpPC)) gene expression in Symbiodinium within the coral Acropora aspera. Thermal stress leads to a decrease in Symbiodinium photosynthetic efficiency by day eight, while symbiont density was significantly lower on day sixteen. Over this time period, the gene expression of five SymbiodiniumacpPC genes was quantified. Three acpPC genes exhibited up-regulated expression when corals were exposed to temperatures above 31.5 °C (acpPCSym_1:1, day sixteen; acpPCSym_15, day twelve; and acpPCSym_18, day ten and day sixteen). In contrast, the expression of acpPCSym_5:1 and acpPCSym_10:1 was unchanged throughout the experiment. Interestingly, the three acpPC genes with increased expression cluster together in a phylogenetic analysis of light-harvesting complexes. |
| Databáze: | OpenAIRE |
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