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Nitrogen fixation by the unicellular blue-green alga Aphanothece

โœ Scribed by Singh, P. K.

Publisher
Springer-Verlag
Year
1973
Weight
325 KB
Volume
92
Category
Article
ISSN
0003-9276

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โœฆ Synopsis

Frequent growth of unicellular blue-green alga Aphanothece sp. was observed in medium free of combined nitrogen. Its generation time was 12 h and more than 2 mg of nitrogen was fixed in 25 days. Its growth and nitrogen fixation were comparable to other heterocystous algae.

Nitrogen fixation in blue-green algae is mostly confined to heterocystous forms in aerobic conditions (Stewart, 1971;Stewart et al., 1968) and it has been demonstrated in microaerophilic conditions in non-heterocystous Plectonema boryanum (Stewart and Lex, 1970). Wyatt and Silvey (1969) and Rippka et al. (1971) reported nitrogen fixation in unicellular blue-green algal species of Gloeocapsa. There is no other report in defined conditions on nitrogen fixation by unicellular blue-green algae either ~erobically or anaerobically. The present communication deals with the frequent growth of Aphanothece sp. in nitrogen free medium and fixation of atmospheric nitrogen.

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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,