Structure, metabolism and nitrogenase regulation in the Azolla-Anabaena association
1991
Tel-Or, E. | Bar, E. | Watad, C. | Klein, O. | Forni, C.
Structural relations between the Azolla leaf cavity envelope, hair cells and the cyanobiont Anabaena azollae were tested with frozen hydrated preparations by scanning electron microscopy, exhibiting close interactions between the cyanobiont and the cavity envelope cells, and a mucilage layer covering parts of the cavity envelope. Hair cells contained starch granules and the cyanobiont exhibited amylase activity hence, both starch, fructose and sucrose can serve as carbon substrates of the cyanobiont. Light regulation of nitrogenase seems to involve the direct effect of light and the effect of oxygen as resolved by nitrogenase analysis and immuno-blot of dinitrogenase reductase. The respiratory activity of the cyanobiont is high and heterotrophic growth increased cytochrome oxidase activity.
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