An energy-dependent, transient peak in the minute range decay of luminescence, present in CO sub(2)-accumulating cells of Scenedesmus obliquus

Photosynthetic O sub(2) evolution in the green alga, Scenedesmus obliquus) was shown to be more sensitive to the uncoupler FCCP when assayed in a low C sub(i) medium than in a high C sub(i) medium, indicating the action of an energy-dependent mechanism for C sub(1) uptake. Low C sub(i) adapted algae...

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Bibliographic Details
Published in:FEBS letters 1986-01, Vol.199 (1), p.75-79
Main Authors: Sundblad, L-G, Plamqvist, K, Samuelsson, G
Format: Article
Language:English
Subjects:
electron transport
luminescence
oxygen
Scenedesmus obliquus
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Summary:Photosynthetic O sub(2) evolution in the green alga, Scenedesmus obliquus) was shown to be more sensitive to the uncoupler FCCP when assayed in a low C sub(i) medium than in a high C sub(i) medium, indicating the action of an energy-dependent mechanism for C sub(1) uptake. Low C sub(i) adapted algae exhibited characteristic luminescence decay kinetics with a transient peak 20-60 s after excitation. This peak was abolished by addition of FCCP and HCO sub(3) super(-). The effect caused by HCO sub(3) super(-) was partially reversed by methyl viologen. In view of the results obtained, a model is presented in order to discuss the origin of the transient luminescence peak.
ISSN:0014-5793