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All vegetative cells of Anabaena doliolum differentiated into akinetes. These showed respiratory O2 uptake but lacked photosynthetic pigments and O2 evolution. Activities of nitrogenase, glutamine synthetase, nitrate reductase and aspartate dehydrogenase were totally absent, while glutamate dehydrogenase showed extremely low activity. Glutamate-oxaloacetate transaminase activity was similar to that in whole filaments but alanine dehydrogenase and glutamate-pyruvate transaminase activities were much lower. Thus, transformation of vegetative cells into akinetes was accompanied by the loss of photosynthetic machinery, ammonia-generating systems and the enzyme of primary ammonia assimilation.
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