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Dissipation of excess energy triggered by blue light in cyanobacteria with CP43′ (isiA) |
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| Authors: | Jean-Charles Cadoret,Raphaë l Demouliè re,Johann Lavaud,Jean Houmard,Anne-Lise Etienne |
| Affiliation: | a Organismes Photosynthétiques et Environnement, FRE 2433 CNRS, Département de Biologie, ENS, 46 rue d'Ulm, 75230 Paris cedex 05, France b Plant Ecophysiology, Department of Biology, University of Konstanz, Postfach M611, 78457 Konstanz, Germany c Department of Biophysics, Leiden University, PO Box 9504, 2300 RA Leiden, Netherlands |
| Abstract: | The chlorophyll-protein CP43′ (isiA gene) induced by stress conditions in cyanobacteria is shown to serve as an antenna for Photosystem II (PSII), in addition to its known role as an antenna for Photosystem I (PSI). At high light intensity, this antenna is converted to an efficient trap for chlorophyll excitations that protects system II from photo-inhibition. In contrast to the ‘energy-dependent non-photochemical quenching’ (NPQ) in chloroplasts, this photoprotective energy dissipation in cyanobacteria is triggered by blue light. The induction is proportional to light intensity. Induction and decay of the quenching exhibit the same large temperature-dependence. |
| Keywords: | DCMU, 3-(3&prime ,4&prime -dichlorophenyl)-1,1-dimethylurea NPQ, non-photochemical quenching PSII, Photosystem II PSI, Photosystem I QA, PSII primary electron acceptor |
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