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Plant and Cell Physiology, 1962, Vol. 3, No. 1 43-51
© 1962

Article

METHYLENE BLUE INHIBITION OF PHOTOSYNTHESIS IN RHODOPSEUDOMONAS PALUSTRIS

SEIKICHI IZAWA1

Department of Biophysics and Biochemistry, Faculty of Science, University of Tokyo

1. Photosynthesis in Rhodopseudomonas palustris was found to be completely inhibited by the reduced form of methylene blue at the concentration below 1x10–5 M, provided that the cells had been in contact with the dye in the dark in anaerobiosis. The inhibition could be eliminated by washing the poisoned cells or by replacing the anaerobic atmosphere with an aerobic one.

2. Other thiazine or oxazine dyes with E10 near 0 volt, such as thionine, brilliant cresyl blue and toluidine blue, in their reduced forms, were also almost equally effective.

3. The mechanism of this dye-inhibition of bacterial photosynthesis was discussed.

1Present address: Laboratory of Biological Chemistry, Tokyo Institute of Technology, Meguro-ku, Tokyo.

(Received August 21, 1961; )
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