Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Plant Physiology 60:109-114 (1977)
© 1977 American Society of Plant Biologists

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Articles

Phosphoserine and Phosphohydroxypyruvic Acid

Evidence for Their Role as Early Intermediates in Photosynthesis 1

Larry S. Daley2 and R. G. S. Bidwell

a Department of Biology, Queens University, Kingston, Ontario, K7L 3N6, Canada

Photosynthetic fixation of 14CO2 in the bean Phaseolus vulgaris, cv. Pencil Pod Black Wax, resulted in the appearance of labeled compounds that were characterized as phosphoserine and phosphohydroxypyruvate by chromatographic separation and by the synthesis of chemical derivatives. In 14CO2/12CO2 pulse-chase experiments these metabolites demonstrated the rapid pool saturation and depletion of 14C characteristic of early intermediates in photosynthetic carbon fixation. They were present in sufficient amounts to account for about 35% of total carbon fixed in 1 minute.

2 Present address: Depts. of Botany and Horticulture, University of Georgia, Athens Ga. 30602.

1 Research supported by grants from the National Research Council of Canada to R. G. S. B.






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Copyright © 1977 by the American Society of Plant Biologists