Influence of phosphate concentration on the respiratory activity of Azotobacter vinelandii

✍ Scribed by Dr. L. Haldenwang; U. Behrens

• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 268 KB
• Volume: 23
• Category: Article
• ISSN: 0233-111X
• DOI: 10.1002/jobm.19830230806

✦ Synopsis

Abstract

Azotobacter vinelandii was grown in batch cultures supplied with ammonia as an N‐source and phosphate at limiting concentration. After phosphate depletion the respiratory rate was affected in a characteristic way. The oxygen consumption during growth and the phase following growth was substantially higher than in cultures amply supplied with phosphate. It is suggested that phosphate limitation impairs the oxidative phosphorylation and stimulates the substrate phosphorylation which leads to a higher degree of respiratory NAD(P)H oxidation due to changes in the branched electron transport system.