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Fructose supported the heterotrophic growth of the cyanobiont Anabaena azollae, isolated from the water fern Azolla filiculoides, and also enhanced its growth in the light by 2-3-fold. Fructose was taken up at a high rate in the light and in the dark, in an energy-dependent reaction. The photosynthetic and respiratory activities of the fructose grown cells were modified: O 2  evolution in vivo was decreased by 40%, while PS I activity and dark respiration were 2-3-fold higher than in autotrophically grown cells. These changes were accompanied by 2-3-fold increase in heterocyst differentiation and by a 4-fold stimulation of nitrogenase activity.

Fructose-Enhanced Development and Growth of the N 2 -Fixing Cyanobiont Anabaena azollae