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  • Title: Uncoupling of photosystems during light dependent dinitrogen fixation by a non-heterocystous cyanobacterium Plectonema boryanum.
    Author: Misra HS, Tuli R.
    Journal: Indian J Biochem Biophys; 1994 Aug; 31(4):310-4. PubMed ID: 8002013.
    Abstract:
    Plectonema boryanum grows under microaerobic nitrogen starvation conditions by temporal separation of the oxygen-sensitive nitrogen fixation and the oxygen-evolving photosynthesis. During the nitrogen-fixation phase, depression in light-dependent oxygen evolution results from alterations in the stare of QA/QB complex. The reaction centre in photosystem II is not oxidised efficiently. Light dependence of nitrogenase function under such conditions appears to be related to the coupling of photosystem I to endogenous electron donors, such as glycollate. This cyanobacterium provides a natural example of in vivo shift in coupling between the photosystems during nitrogen-fixing growth.
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