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Photosynthetic circadian rhythmicity patterns of Symbiodinium, [corrected] the coral endosymbiotic algae.
- Source :
-
Proceedings. Biological sciences [Proc Biol Sci] 2013 Apr 03; Vol. 280 (1759), pp. 20122942. Date of Electronic Publication: 2013 Apr 03 (Print Publication: 2013). - Publication Year :
- 2013
-
Abstract
- Biological clocks are self-sustained endogenous timers that enable organisms (from cyanobacteria to humans) to anticipate daily environmental rhythms, and adjust their physiology and behaviour accordingly. Symbiotic corals play a central role in the creation of biologically rich ecosystems based on mutualistic symbioses between the invertebrate coral and dinoflagellate protists from the genus Symbiodinium. In this study, we experimentally establish that Symbiodinium photosynthesis, both as a free-living unicellular algae and as part of the symbiotic association with the coral Stylophora pistillata, is 'wired' to the circadian clock mechanism with a 'free-run' cycle close to 24 h. Associated photosynthetic pigments also showed rhythmicity under light/dark conditions and under constant light conditions, while the expression of the oxygen-evolving enhancer 1 gene (within photosystem II) coincided with photosynthetically evolved oxygen in Symbiodinium cultures. Thus, circadian regulation of the Symbiodinium photosynthesis is, however, complicated as being linked to the coral/host that have probably profound physiochemical influence on the intracellular environment. The temporal patterns of photosynthesis demonstrated here highlight the physiological complexity and interdependence of the algae circadian clock associated in this symbiosis and the plasticity of algae regulatory mechanisms downstream of the circadian clock.
- Subjects :
- Algal Proteins genetics
Algal Proteins metabolism
Animals
Carotenoids metabolism
Chlorophyll metabolism
Chromatography, High Pressure Liquid
Circadian Rhythm
DNA, Complementary genetics
DNA, Complementary metabolism
Molecular Sequence Data
Oxygen metabolism
Photoperiod
Photosystem II Protein Complex metabolism
Polymerase Chain Reaction
RNA, Messenger genetics
RNA, Messenger metabolism
Sequence Analysis, DNA
Anthozoa physiology
Dinoflagellida physiology
Photosynthesis
Symbiosis
Subjects
Details
- Language :
- English
- ISSN :
- 1471-2954
- Volume :
- 280
- Issue :
- 1759
- Database :
- MEDLINE
- Journal :
- Proceedings. Biological sciences
- Publication Type :
- Academic Journal
- Accession number :
- 23554392
- Full Text :
- https://doi.org/10.1098/rspb.2012.2942