Circadian rhythm of photosynthesis and concurrent oscillations of transcript abundance of photosynthetic genes in the marine red alga Grateloupia turuturu.


Contact
sjacobsen [ at ] awi-bremerhaven.de

Abstract

Many biological processes are under the control of an endogenous circadianclock, a prominent example within the plant kingdom being photosynthesis.Here we report a robust circadian rhythm of photosynthetic oxygen evolutionin the red marine macroalga Grateloupia turuturu. The rhythm was obviousin continuous white light at irradiances ranging from 50 to 500 µmol photonsm-2 s-1. To further assess whether this physiological rhythm was correlatedwith changes at the level of gene transcription in G. turuturu, abundance ofthe transcripts encoding the phycoerythrin a and b subunits and theribulose 1,5 bisphosphate carboxylase/oxygenase (Rubisco) subunits was analysed under light-dark cycles (LD) and constant illumination (LL).Abundance of both transcripts exhibited diurnal and circadian changes inG. turuturu. In LD conditions, abundance of the phycoerythrin transcriptpeaked between midday and late afternoon. This pattern was maintainedunder constant conditions (LL) for up to three cycles. In case of the Rubiscotranscript, mRNA abundance started to increase in the morning and peakedaround midday in LD cycles. In LL, Rubisco transcript abundance continuedto oscillate, but the increase of mRNA started earlier, already duringsubjective night. Our results suggest control of both transcripts by thecircadian clock in G. turuturu.



Item Type
Article
Authors
Divisions
Programs
Publication Status
Published
Eprint ID
11023
DOI 10.1080/09670260400009908

Cite as
Goulard, F. , Lüning, K. and Jacobsen, S. (2004): Circadian rhythm of photosynthesis and concurrent oscillations of transcript abundance of photosynthetic genes in the marine red alga Grateloupia turuturu. , European journal of phycology, 39 , pp. 431-437 . doi: 10.1080/09670260400009908


Share
Add to AnyAdd to TwitterAdd to FacebookAdd to LinkedinAdd to PinterestAdd to Email


Citation

Research Platforms
N/A

Campaigns
N/A


Actions
Edit Item Edit Item