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Nitrogen fixation by Anabaena cylindrica

โœ Scribed by Weare, N. M. ;Benemann, John R.

Book ID
104769906
Publisher
Springer-Verlag
Year
1973
Weight
724 KB
Volume
93
Category
Article
ISSN
0003-9276

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โœฆ Synopsis

The effects of oxygen, light and photosynthesis inhibitors on nitrogenase activities in Anabaena cylindrica batch cultures were followed as a function of time after inoculation. During the early rapid growth period the nitrogenase activities of cultures grown under air/CO 2 or N2/C02 were relatively resistant to oxygen and DCMU inhibition. These cultures also exhibited oxygen-dependent nitrogenase activity in the dark of up to 50~ of that measured in the light. After active growth ceased the cultures continued to slowly grow for a prolonged period of time. The nitrogenase activities of these "old" cultures were very sensitive to

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In long-term experiments, nitrogen fixation in photosynthetic organisms is usually dependent upon the presence of light (FoGG and THAN TUN, 1960; F\_au and FOGG, 1962) although certain photosynthetic nitrogen-fixers can grow and fix nitrogen in the dark using organic media (Nostoc muscorum, ALLISON,