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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

Journal Article · · Plant Physiol.; (United States)
DOI:https://doi.org/10.1104/pp.60.4.492· OSTI ID:7057788
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 CO/sub 2/. Glycolate yield increased with an elevation of O/sub 2/, 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 ..mu..moles per milligram chlorophyll per hour while the highest rate observed was 92 with 2.5 mM fructose 1,6-diphosphate in 100% O/sub 2/. The highest yields of glycolate synthesized from fructose 1,6-diphosphate, ribose 5-phosphate, or glycerate 3-phosphate were 0.14, 1.24, and 0.30, respectively, on a molar basis.
Research Organization:
Brandeis Univ., Waltham, MA
OSTI ID:
7057788
Journal Information:
Plant Physiol.; (United States), Journal Name: Plant Physiol.; (United States) Vol. 60:4; ISSN PLPHA
Country of Publication:
United States
Language:
English