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Plant and Cell Physiology, 1982, Vol. 23, No. 4 595-605
© 1982

Article

Movement of Ions and Change in the Electrical Potential Profile across the Membrane of the Rhodopseudomonas sphaeroides Chromatophore Studied by the Absorbance Change of Carotenoid

Shigeru Itoh1

Department of Biology, Faculty of Science, Kyushu University 33 Fukuoka 812, Japan

The relationship between the light-induced movements of electrons and ions and the change in the electrical potential profile across the chromatophore membranes of a green mutant of Rhodopseudomonas sphaeroides was studied by measuring the carotenoid absorbance change.

The light-induced absorbance change of the carotenoid, i.e., the change of electrical field within the membrane, was shown to be affected by the following factors: (1) the formation of a membrane potential by the electrogenic electron transfer; (2) the decay of the membrane potential due to the electrophoretic movements of ions; (3) the development of a diffusion potential induced by the ion movements; and (4) the change of surface potential of the inner surface of the chromatophore membrane due to the proton uptake.

The kinetics of the absorbance change of carotenoid during illumination were semiquantitatively explained by considering these factors, and the light-induced change in the electrical potential profile across the membrane was estimated under various conditions.

1 Present address: National Institute for Basic Biology, Okazaki 444, Japan.

(Received October 21, 1981; Accepted March 18, 1982)
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