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Plant and Cell Physiology, 1962, Vol. 3, No. 3 197-207
© 1962

Article

LIGHT-INDUCED OXYGEN EVOLUTION CAUSED BY HYDROGEN PEROXIDE IN CATALASE-INHIBITED CHLORELLA CELLS

TOYOYASU HIROKAWA1

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

  1. Chlorella cells and spinach chioroplasts, whose catalase activity had been more than 90% inhibited by 10–5 M azide, were found to decompose H2O2 photochemically to liberate oxygen, indicating that H2O2 was used as an oxidant of the HILL reaction.
  2. That, however, the observed phenomena cannot be fully accounted for in terms of the HILL reaction with H2O2 was revealed by the observation that an extract of Chiorella cells, which had been completely freed from chlorophyll, also showed a light-accelerated O2 evolution from H2O2 in the presence of 10–5 M azide. This extract contained a large quantity of catalase, which seemed to have been, in some way, involved in the reaction in question.
  3. The catalatic H2O2 decomposition caused by crystalline catalase of mammalian liver (in the presence of 10–5 M azide) was not accelerated by the effect of light.

1 Present address: Department of Biology, Faculty of Science, Niigata University, Niigata.

(Received June 4, 1961; )
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