Effect of Oxygen on Photosynthetic 14CO2 Fixation in Chroomonas sp. (Cryptophyta) I. Some Characteristics of the Oxygen Effect |
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Authors: | Suzuki Kensaku; Ikawa Tomoyoshi |
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Institution: | Institute of Biological Sciences, University of Tsukuba Sakura-mura, Ibaraki 305, Japan |
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Abstract: | The effect of oxygen on photosynthetic 14CO2 fixation in theair-grown freshwater flagellate Chroomonas sp. (Cryptophyta)was studied. Considerable inhibition by anaerobiosis was observedonly under light-saturated conditions with no effect from theCO2 concentration. This inhibition was reversed by 2% O2. With,more than 2% O2, the rate of 14CO2 fixation was inhibited; 100%O2 caused about 20% inhibition which could be reversed by 2%O2. The degree of inhibition was only slightly higher at lowconcentrations (less than 0.43 mM NaHCO3) than at high CO2 concentrations,indicating that photorespiration is not a main cause of thisinhibition. Possible causes of the inhibitions by anaerobiosisand by oxygen are discussed. (Received June 29, 1983; Accepted January 23, 1984) |
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