Luminescence decay kinetics in relation to the relaxation of the transthylakoid ΔpH from high and low CO 2 adapted cells of Scenedesmus obliquus

Luminescence decay kinetics was shown to be polyphasic with two relative maxima observed, when high CO 2 adapted cells of Scenedesmus obliquus were stressed by CO 2 deficiency. Low CO 2 adapted cells exhibited a single maximum. Luminescence from high CO 2 adapted cells under high CO 2 conditions dec...

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Bibliographic Details
Published in:FEBS letters 1986-12, Vol.209 (1), p.28-32
Main Authors: Sundblad, Lars-Göran, Palmqvist, Kristin, Samuelsson, Göran
Format: Article
Language:English
Subjects:
LuminescenceCO 2 accumulation pH gradientThylakoid membrane
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Summary:Luminescence decay kinetics was shown to be polyphasic with two relative maxima observed, when high CO 2 adapted cells of Scenedesmus obliquus were stressed by CO 2 deficiency. Low CO 2 adapted cells exhibited a single maximum. Luminescence from high CO 2 adapted cells under high CO 2 conditions decayed asymptotically without maxima. The magnitude of the transthylakoid ΔpH was shown to be related to the intensity of luminescence in an antiparallel way. The relaxation kinetics of the -ΔpH was shown to be complex, with an interval of increasing or maintained ΔpH. A working hypothesis is presented in order to explain polyphasic luminescence decay kinetics in terms of luminescence quenching by the transthylakoid ΔpH.
ISSN:0014-5793
1873-3468
DOI:10.1016/0014-5793(86)81078-X