Über die energetische Kopplung der Nitritassimilation von Grünalgen an Atmung und Photosynthese

✍ Scribed by Anton Hofmann

• Publisher: Springer-Verlag
• Year: 1971
• Tongue: English
• Weight: 719 KB
• Volume: 102
• Category: Article
• ISSN: 0032-0935
• DOI: 10.1007/bf00391451

✦ Synopsis

Dependence of Nitrite Assimilation in Green Algae on Energy Snpp]icd by Respiration and Photosynthesis

Summary. Inhibitors and uncouplers of phosphorylation, i.e., arsenate, 2.4dinitrophenol (DNP), pentachlorophenol (PCP), and carbonyl cyanide m-chlorophenylhydrazone (CCCP), inhibit the assimilation of nitrite by the green alga Ankistrodesmus braunii in the dark and in the light. In a medium containing nitrate, these inhibitors interrupt nitrate reduction at the level of nitrite. In phosphatedeficient algae, the assimilation of nitrite can be decreased by a concomitant, energy-dependent uptake of chloride and phosphate ions. These results support the assumption that high-energy phosphate is required for the assimilation of nitrite.

CO 2 and glucose (after pre-illumination) increase nitrite assimilation in the light. Photosynthetic nitrite reduction is inhibited by 3-(3',4'-dichlorophenyl)-l,1dimethyl urea (DCMU), an inhibitor of oxygen evolution, and by disalieylidenepropanediamine-(1,3) (DSPD), an inhibitor of the photosynthetic reduction of ferredoxin.