Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 44:55-59 (1969)
© 1969 American Society of Plant Biologists

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Articles

Glycolate Stimulation of Oxygen Evolution During Photosynthesis 1

Edward B. Nelson, N. E. Tolbert and J. L. Hess2

a Department of Biochemistry, Michigan State University, East Lansing, Michigan 48823

Glycolate and glyoxylate stimulated 100% to 300% the rate of oxygen evolution by Scenedesmus in the light in the absence of added carbon dioxide. This stimulation occurred either aerobically or anaerobically, and was sensitive to CMU. Aerobic dark respiration was stimulated 25% to 100% by glycolate. This phenomenon was best demonstrated with synchronized Scenedesmus at the stage of cell division. For glycolate stimulation of oxygen evolution, a dark preincubation of 1 minute or less was necessary. In comparative test with other compounds of metabolism and photosynthesis, the stimulation of oxygen evolution was greatest by glycolate and glyoxylate. In a proposed scheme glyoxylate serves as a terminal hydrogen acceptor from NADPH produced by photosynthesis, and it thereby stimulates oxygen evolution when carbon dioxide is not available. Transformation of glycolate to glyoxylate in these cells would have to occur in the absence of oxygen.

2 Present address: Department of Biochemistry, Virginia Polytechnical Institute, Blacksburg, Virginia.

1 Supported in part by NSF grant GB 4154 and published as journal article No. 4127 of the Michigan Agricultural Experiment Station.




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D. Oliver and I Zelitch
Increasing photosynthesis by inhibiting photorespiration with glyoxylate
Science, June 24, 1977; 196(4297): 1450 - 1451.
[Abstract] [PDF]


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Copyright © 1969 by the American Society of Plant Biologists