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State transitions in the cyanobacterium Synechococcus elongatus 7942 involve reversible quenching of the photosystem II core
- Source :
- Biochimica biophysica acta (BBA)-Bioenergetics, Biochimica biophysica acta (BBA)-Bioenergetics, Elsevier, 2018, 1859 (10), pp.1059--1066. ⟨10.1016/j.bbabio.2018.06.008⟩, Biochimica biophysica acta (BBA)-Bioenergetics, 2018, 1859 (10), pp.1059--1066. ⟨10.1016/j.bbabio.2018.06.008⟩, Biochimica et Biophysica Acta-Bioenergetics 1859 (2018) 10, Biochimica et Biophysica Acta-Bioenergetics, 1859(10), 1059-1066, Biochimica et Biophysica Acta (BBA)-Bioenergetics
- Publication Year :
- 2018
- Publisher :
- HAL CCSD, 2018.
-
Abstract
- International audience; Cyanobacteria use chlorophyll and phycobiliproteins to harvest light. The resulting excitation energy is delivered to reaction centers (RCs), where photochemistry starts. The relative amounts of excitation energy arriving at the RCs of photosystem I (PSI) and II (PSII) depend on the spectral composition of the light. To balance the excitations in both photosystems, cyanobacteria perform state transitions to equilibrate the excitation energy. They go to state I if PSI is preferentially excited, for example after illumination with blue light (light I), and to state II after illumination with green-orange light (light II) or after dark adaptation. In this study, we performed 77-K time-resolved fluorescence spectroscopy on wild-type Synechococcus elongatus 7942 cells to measure how state transitions affect excitation energy transfer to PSI and PSII in different light conditions and to test the various models that have been proposed in literature. The time-resolved spectra show that the PSII core is quenched in state II and that this is not due to a change in excitation energy transfer from PSII to PSI (spill-over), either direct or indirect via phycobilisomes.
- Subjects :
- 0106 biological sciences
0301 basic medicine
Materials science
Crop Physiology
Photosystem II
[SDV]Life Sciences [q-bio]
Biophysics
Photosystem I
Photochemistry
Cyanobacteria
porphyridium-cruentum
01 natural sciences
7. Clean energy
Biochemistry
Fluorescence spectroscopy
synechocystis pcc 6803
03 medical and health sciences
chemistry.chemical_compound
Photosystem
VLAG
Time-resolved fluorescence spectroscopy
wild-type
photosynthesis
excitation-energy
Phycobiliprotein
less mutant
picosecond fluorescence spectroscopy
Cell Biology
PE&RC
phycobilisome
030104 developmental biology
Biofysica
chemistry
State transitions
synechococcus sp
Excited state
Chlorophyll
cells
Phycobilisome
EPS
010606 plant biology & botany
Subjects
Details
- Language :
- English
- ISSN :
- 00052728 and 18792650
- Database :
- OpenAIRE
- Journal :
- Biochimica biophysica acta (BBA)-Bioenergetics, Biochimica biophysica acta (BBA)-Bioenergetics, Elsevier, 2018, 1859 (10), pp.1059--1066. ⟨10.1016/j.bbabio.2018.06.008⟩, Biochimica biophysica acta (BBA)-Bioenergetics, 2018, 1859 (10), pp.1059--1066. ⟨10.1016/j.bbabio.2018.06.008⟩, Biochimica et Biophysica Acta-Bioenergetics 1859 (2018) 10, Biochimica et Biophysica Acta-Bioenergetics, 1859(10), 1059-1066, Biochimica et Biophysica Acta (BBA)-Bioenergetics
- Accession number :
- edsair.doi.dedup.....98a753f4c644f70e9ede2befe9a8b831