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Azolla and Anabaena azollae symbiosis

Azolla
Azolla.

Azolla is an aquatic fern of the Azollaceae family.  Azolla hosts the nitrogen-fixing blue-green algae, Anabaena azollae.  In turn, in the symbiotic relationship, Azolla synthesizes through photosynthesis the sugars and the suitable environment for growth needed by Anabaena azollae.  

 

Under optimal conditions, Azolla can double its mass almost every two days; in a controlled experiment by the 

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