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Membrane potential is involved in regulation of photosynthetic reactions in the marine diatom Thalassiosira weissflogii

Paper ID Volume ID Publish Year Pages File Format Full-Text
30942 44518 2011 5 PDF Available
Title
Membrane potential is involved in regulation of photosynthetic reactions in the marine diatom Thalassiosira weissflogii
Abstract

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 ΔpH-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.

Keywords
Chlorophyll a fluorescence; OJIP transients; Transthylakoid membrane potential; Thalassiosira weissflogii
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Membrane potential is involved in regulation of photosynthetic reactions in the marine diatom Thalassiosira weissflogii
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 102, Issue 2, 7 February 2011, Pages 169–173
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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