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- Title
The Influence of Photosynthetic Factors and Metabolic Inhibitors on the Uptake of Phosphate in P-Deficient Scenedesmus.
- Authors
Kylin, Anders
- Abstract
The cells used in the present investigation had a phosphate content of about 20 per cent as compared with the status in normal cultures. The uptake of phosphate during a period of 4 hours was determined at a pH of 6.5, kept constant with the aid of a citrate buffer. In the absence of CO2, light increased the uptake of Phosphate with saturation around 14,000 erg/cm²s. With 5 per cent CO2 in the air the relationship was more complicated, and the uptake of phosphate must be related to more than one process during active photosynthesis. The inhibiting effect of CO2 in air was noticeable already at low concentrations both in light and in darkness. With the system used, this supports earlier indications for internal recycling of orthophosphate. CO2 was inhibiting also in nitrogen iii the light. Selenate in a concentration of 2 mM gave a slight and rather irregular inhibition. - Anaerobiosis had no effect in the light but gave a large decrease in the dark. - DNP (0.1 mM) was somewhat more active in the dark than in the light. The lower concentrations tested had no effect in either case. - Menadione (0.1 mM) inhibited strongly, and more in illuminated than in non-illuminated cells.
- Subjects
PHOTOSYNTHESIS; HYDROGEN-ion concentration; OBSTRUCTIONS of lighting; PHOTOBIOLOGY; METABOLISM; RESPIRATION
- Publication
Physiologia Plantarum, 1966, Vol 19, Issue 3, p644
- ISSN
0031-9317
- Publication type
Article
- DOI
10.1111/j.1399-3054.1966.tb07048.x