Oxygen enhancement of photosynthesis in Anacystis nidulans cells1 |
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Authors: | Miyachi Shigetoh; Okabe Kei-ichiro |
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Institution: | 2Radioisotope Centre, University of Tokyo Bunkyo-ku, Tokyo, Japan
3Institute of Applied Microbiology, University of Tokyo Bunkyo-ku, Tokyo, Japan |
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Abstract: | Oxygen enhanced photosynthetic 14CO2 fixation in Anacystis nidulanscells. Results obtained under different conditions revealedthe following properties of the oxygen enhancement: - The enhancement was most significant at ca. 10% O2. Furtherincrease in oxygen concentration decreased the enhancing effect.The rate under 100% O2 was equivalent to or a little higherthan that under N2 gas.
- b) With the increase in CO2 concentration,the magnitude ofthe enhancing effect decreased. No oxygen enhancementwas observedwhen the CO2 concentration. was raised to 9,000ppm.
- c) The enhancement was observed only at high light intensities.No enhancement was observed when the rate of photosynthesiswas limited by light intensity.
- Ribulose 1,5-diphosphate (RuDP)carboxylase activity was demonstratedin the extract obtainedfrom A. nidulans cells. We also foundthat the RuDP carboxylaseactivity in this extract was competitivelyinhibited by oxygen.
- Based on the above-mentioned results, the possible mechanismunderlying the observed enhancing effect of oxygen was discussed.
(Received May 10, 1976; ) |
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