title: The relationship between the activities of the pentose phosphate pathway and glycolysis during early stages of floral induction in spinach.
abstract: A quantitative cytochemical study was made of fructokinase, glucokinase, and fructokinase (both PFK-ATP and PFK-PP + F-2:6-P) activities in shoot apices of 4-week old Spinacia oleracea. The rates of activity of these enzymes in the central zone of the shoot apex of plants kept on a short day regime were compared with those from plants transferred from a range of timing up to 24 h to a continuous light regime when floral induction occurred. A mechanism is suggested explaining how no measurable change in activities of the enzymes assayed could still account for the availability of adequate levels G-6-P as substrate for pentose pathway activity which is almost doubled early on in cells of the central zone of shoot apices induced to flower.
mesh_terms: D005631:Fructokinases / Q000378:metabolism; D005941:Glucokinase / Q000378:metabolism; D005947:Glucose / Q000378:metabolism; D005954:Glucosephosphate Dehydrogenase / Q000378:metabolism; D006019:Glycolysis; D006651:Histocytochemistry; D010428:Pentosephosphates / Q000378:metabolism*; D018521:Plant Physiological Phenomena
chemical_list: D010428:Pentosephosphates; D005954:Glucosephosphate Dehydrogenase; D005631:Fructokinases; D005941:Glucokinase; C046173:fructokinase; D005947:Glucose