Misra H S, Tuli R
Molecular Biology & Agriculture Division, Bhabha Atomic Research Centre, Bombay.
Indian J Biochem Biophys. 1994 Aug;31(4):310-4.
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.
织线藻（Plectonema boryanum）在微需氧氮饥饿条件下生长，通过对氧敏感的固氮作用和放氧光合作用的时间分离来实现。在固氮阶段，光依赖型放氧的降低是由于QA/QB复合体状态的改变所致。光系统II中的反应中心不能有效地被氧化。在这种条件下，固氮酶功能对光的依赖性似乎与光系统I与内源性电子供体（如乙醇酸）的偶联有关。这种蓝细菌为固氮生长过程中光系统之间偶联的体内转变提供了一个自然实例。
