Phosphorus metabolism and the photoproduction of oxygen and hydrogen in anaerobic chlorella

✍ Scribed by W. Lindeman; C. J. P. Spruit

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 284 KB
• Volume: 82
• Category: Article
• ISSN: 0165-0513
• DOI: 10.1002/recl.19630820705

✦ Synopsis

Abstract

The concentrations of oxygen and of phosphorylated intermediates of the photosynthetic carbon cycle have been followed simultaneously in illuminated suspensions of anaerobically adapted Chlorella cells. Initially, very little phosphoglyceric acid is available, and “reducing power” generated by illumination, is utilized chiefly by an active hydrogenase. In the presence of sufficiently high concentrations of carbon dioxide, phosphoglyceric acid is formed from ribulose diphosphate and competes with the hydrogenase for photochemical reducing power. As soon as the oxygen produced photochemically has reached a concentration sufficient to inhibit the hydrogenase, the reducing power is used up entirely in normal photosynthesis.