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Plant Physiology 56:718-722 (1975)
© 1975 American Society of Plant Biologists

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Articles

Effect of Oxygen on Photosynthesis by Spinach Leaf Protoplasts 1

Mikio Nishimura, Douglas Graham2 and Takashi Akazawa

a Research Institute for Biochemical Regulation, School of Agriculture, Nagoya University, Chikusa, Nagoya 464, Japan

The photosynthetic CO2 fixation by spinach leaf (Spinacia oleracea L. var. Kyoho) protoplasts was inhibited by substituting an atmosphere of N2 with one of either air (21% O2) or 100% O2. The inhibitory effect of 100% O2 was greater than that of air. The mode of inhibition by 100% O2 and air was competitive with respect to CO2; Ki(O2) value was 0.32 mM at pH 7 and 0.28 mM at pH 8.5 The labeling patterns of compounds in protoplasts exposed to 14CO2 in light after transferring them from N2 to O2 atmospheres were examined. There was no detectable 14CO2 incorporation into glycolate under anaerobic and O2 atmospheres; a more marked labeling of glycine occurred under an oxidative environment compared to that under the anaerobic condition, presumably because of a rapid transformation of glycolate to glycine in the protoplasts.

2 Permanent address: Plant Physiology Unit, CSIRO, Division of Food Research and School of Biological Sciences, Macquarie University, North Ryde, N. S. W. 2113, Australia. Recipient of award from the Japan Society for the Promotion of Science under the Visiting Professorship Programme (1974).

1 This is paper XXXII in the series "Structure and Function of Chloroplast Proteins." This research was supported by the grants from the Ministry of Education of Japan (986009), the Toray Science Foundation (Tokyo), and the Naito Science Foundation (Tokyo).






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Copyright © 1975 by the American Society of Plant Biologists