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Plant and Cell Physiology, 1967, Vol. 8, No. 3 475-482
© 1967

Article

CHLOROPHYLL-SENSITIZED REDUCTION OF PLASTOQUINONE BY ASCORBIC ACID AND QUENCHING OF CHLOROPHYLL-FLUORESCENCE BY PLASTOQUINONE1

SHIGEKI OKAYAMA2, SEIKO OKAYAMA3 and YASUTANE CHIBA

Department of Biology, Faculty of Science, Kyushu University Fukoka

  1. Photochemical reduction of plastoquinone by ascorbic acid in ethanol was sensitized with some derivatives of chlorophyll. The order of effectiveness was as follows: allomerized chlorophyll a > chlorophyllin a > chlorophyll a > chlorophyll b > pheophytin a.
  2. Quenching of the fluorescence of chlorophyll a by plastoquinone was observed. The quenching constant calculated was 71 litre per mole.

1Contribution No. 159 from the Department of Biology, Faculty of Science, Kyushu University. Supported in part by a grant-in-aid for Fundamental Scientific Research from the Ministry of Education.

2Present address: Biological Laboratory, General Education Department, Kyushu University, Ropponmatsu, Fukuoka.

3Present address: Biological Institute, Daiichi College of Pharmaceutical Sciences, Tamagawa-machi, Takamiya, Fukuoka.

(Received July 13, 1967; )
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