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Plant Physiology 60:492-495 (1977)
© 1977 American Society of Plant Biologists

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Articles

Influence of pH upon the Warburg Effect in Isolated Intact Spinach Chloroplasts

II. Interdependency of Glycolate Synthesis upon pH and Calvin Cycle Intermediate Concentration in the Absence of Carbon Dioxide Photoassimilation 1

Yoke Wah Kow, J. Michael Robinson2 and Martin Gibbs

a Institute for Photobiology of Cells and Organelles, Brandeis University, Waltham, Massachusetts 02154

The light-dependent synthesis of glycolate derived from fructose 1,6-diphosphate, ribose 5-phosphate, or glycerate 3-phosphate was studied in the intact spinach (Spinacia oleracea) chloroplasts in the absence of CO2. Glycolate yield increased with an elevation of O2, pH, and the concentration of the phosphorylated compound supplied. No pH optimum was observed as the pH was increased from 7.4 to 8.5. The average maximal rate of glycolate synthesis was 50 µmoles per milligram chlorophyll per hour while the highest rate observed was 92 with 2.5 mM fructose 1,6-diphosphate in 100% O2. The highest yields of glycolate synthesized from fructose 1,6-diphosphate, ribose 5-phosphate, or glycerate 3-phosphate were 0.14, 0.24, and 0.30, respectively, on a molar basis.

2 Postdoctoral trainee of National Institutes of Health Grant BM-1586-09.

1 This research was generously supported by National Science Foundation Grant BMS 71-00978 and United States Research and Development Administration Grant ET(11-1) 3231.






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Copyright © 1977 by the American Society of Plant Biologists