Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
Volume 102, Issue 2, Pages 169-173Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotobiol.2010.11.005
Keywords
Chlorophyll a fluorescence; OJIP transients; Transthylakoid membrane potential; Thalassiosira weissflogii
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Funding
- Russian Foundation for Basic Research [10-04-00864-a]
- Russian Ministry of Education and Science [P2219, 02.740.11/06993]
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High-intensity Chl fluorescence transients (OJIP transients) and light-induced kinetics of the delayed light emission were measured in diatom microalga Thalassiosira weissflogii in the presence of various uncouplers and photosynthetic inhibitors. The I step in the OJIP transients in T. weissflogii was essentially reduced or completely absent but was restored in the presence of uncouplers valinomycin, FCCP, and nigericin. Moreover, valinomycin enhanced,pH-dependent non-photochemical fluorescence quenching following the OJIP rise. In the presence of valinomycin, the transthylakoid membrane potential was significantly inhibited as evaluated by measurements of the delayed light emission. The results suggest a membrane potential control of the fluorescence yield in T. weissflogii. Possible mechanisms underlying the observed effects of uncouplers are discussed. (C) 2010 Elsevier BM. All rights reserved.
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