Section 6
Chapter 5,248

Effect of inhibitors on nitrogenase regulation in the cyanobacterium nostoc linckia

Kumar, D.; Kumar, H.D.

Biochemie und Physiologie der Pflanzen (BPP) 179(7): 623-629


DOI: 10.1016/s0015-3796(84)80038-4
Accession: 005247072

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The effects of ammonium ion and certain inhibitors of protein synthesis on nitrogenase activity in N. linckia were compared during heterocyst induction and exponential phases. Early stages of heterocyst differentiation and nitrogenase induction are prone to ammonium inhibition. Nitrogenase activity continued to increase even in presence of ammonium in 36 h old cultures. Addition of ammonium chloride in exponential, N-dependent cultures had little effect on nitrogenase activity up to 16 h whereafter the activity fell. The heterocyst frequency was higher in rifampicin and lower in chloramphenicol, as compared to control cultures.

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