Effect of Oxygen on Photosynthetic ^<14>CO_2 Fixation in Chroomonas sp. (Cryptophyta) I. : Some Characteristics of the Oxygen Effect
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概要
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The effect of oxygen on photosynthetic ^<14>CO_2 fixation in the air-grown freshwater ffagellate Chromonas sp. (Cryptophyta) was studied. Considerable inhibition by anaerobiosis was observed only under light-saturated conditions with no effect from the CO_2 concentration. This inhibition was reversed by 2% O_2. With more than 2% O_2, the rate of ^<14>CO_2 fixation was inhibited; 100% O_2 caused about 20% inhibition which could be reversed by 2% O_2 The degree of inhibition was only slightly higher at low concentrations (less than 0.43 mM NaHCO_3) than at high CO_2 concentrations, indicating that photorespiration is not a main cause of this inhibition. Possible causes of the inhibitions by anaerobiosis and by oxygen are discussed.
- 日本植物生理学会の論文
著者
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Suzuki Kensaku
Institute Of Biological Sciences University Of Tsukuba
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Ikawa Tomoyoshi
Institute Of Biological Sciences The University Of Tsukuba
関連論文
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- Effect of Oxygen on Photosynthetic ^CO_2 Fixation in Chroomonas sp. (Cryptophyta) I. : Some Characteristics of the Oxygen Effect