Fay P
Appl Environ Microbiol. 1976 Mar;31(3):376-9. doi: 10.1128/aem.31.3.376-379.1976.
Nitrogen-fixing activity declines first rapidly and then more gradually when Anabaenopsis circularis is transferred from light into dark conditions. The rate and duration of dark acetylene reduction (nitrogen fixation) depend upon conditions prevailing during the preceding light period. Factors (such as light intensity, CO2 concentration, and supply of glucose), which in the light affect photosynthesis and the accumulation of reserve carbon, have a profound effect on dark nitrogen fixation. Glucose greatly promotes nitrogen fixation in the light and supports prolonged nitrogenase activity in the dark. The results suggest that heterotrophic nitrogen fixation by blue-green algae in the field may be important both under light and dark conditions.
当环状拟鱼腥藻从光照条件转移到黑暗条件下时，固氮活性首先迅速下降，然后下降得较为缓慢。黑暗中乙炔还原（固氮）的速率和持续时间取决于之前光照阶段的环境条件。在光照条件下影响光合作用和储备碳积累的因素（如光照强度、二氧化碳浓度和葡萄糖供应），对黑暗中的固氮作用有深远影响。葡萄糖在光照下极大地促进固氮作用，并在黑暗中维持延长的固氮酶活性。结果表明，野外蓝藻的异养固氮作用在光照和黑暗条件下可能都很重要。
