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Plant and Cell Physiology, 1982, Vol. 23, No. 8 1457-1461
© 1982

Short communication

Dependence of Oxygen Affinity for Mehler Reaction on Photochemical Activity of Chloroplast Thylakoids

Masa-aki Takahashi and Kozi Asada

The Research Institute for Food Science, Kyoto University Uji, Kyoto 611, Japan

The affinity of oxygen (apparent Km) for the photoreduction of molecular oxygen by class II spinach chloroplasts increased with an increase in light intensity. Using a reaction scheme in which the photoreduction of oxygen occurs via the spontaneous oxidation of an electron acceptor of photosystem I, P430, we inferred that the "Km" value is a ratio of the first-order rate constants of photoreduction of P430 plus the internal back decay of the reduced P430 to the second-order rate constant for the oxidation of reduced P430 with oxygen.

(Received July 8, 1982; Accepted September 16, 1982)
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