CATALYTIC EFFECTS OF CARBON DIOXIDE IN CARBON DIOXIDE ASSIMILATING CELLS

概要

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It has been confirmed that absence of carbon dioxide may decrease the rate of oxygen production which a*-companies the photochemical reduction of p-benzoquinone in algae and chloroplasts. This influence of carbon dioxide partial pressure does not apply to the overall oxygen yield. In the blue-green alga Anacystis nidulans the initially small carbon dioxide deficiency effect increases with time spent in the dark. The deterioration of reaction rates is counteracted by light. There seems to be no direct connection or interdependence between the photosynthetic reduction of carbon dioxide and the sensitivity of some part of the photochemical mechanism to loss of carbon dioxide. Not only does addition of quinone to living cells in these experiments destroy their capacity for photosynthesis, but mutant cells that never had this capacity still retain the sensitivity towards lack of carbon dioxide when tested for their ability to reduce quinone. Many different metabolic reactions have been seen to possess such dependency on traces of carbon dioxide, also in non-photosynthetic cells and tissues. The explanation for "catalytic " effects of carbon dioxide ought to be a general one-such as an influence on the efficiency of certain phosphorylations which occur everywhere in the living world.
日本植物生理学会の論文
1963-03-00