According to some references, the universal occurrence of Anabaena azollae inside the leaves of Azolla suggests that reproduction of this water fern may be. Publication details. Anabaena azollae Strasburger , fig. Published in: Strasburger, E.A. (). Das botanische Practicum. Anleitung zum. Cultures of Azolla caroliniana Willd. free of the symbiotic blue-green alga, Anabaena azollae, were obtained by treatment of Azolla fronds with a regimen of .

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Cultures of Azolla caroliniana Willd. These symbiontfree plants can be maintained only on medium containing a combined nitrogen source.

Plants of the Gila Wilderness

Morphological aspects of the symbiotic association show the confinement of the Anabaena azollae within the leaf cavity of the Azolla. Procedures were established for the isolation of pure preparations of Anabaena azollae and Azolla chloroplasts.

It has not yet been possible to grow the isolated alga in independent culture. Photochemical activities of the isolated alga and fern chloroplasts were measured by spectrophotometric assays for photosystems I and II as well as by Pcontent photosystem I and delayed light emission photosystem II.


In the algal fraction, both photosystems were repressed when compared to freeliving Anabaena cylindricabut the relative ratio of photosystem I to photosystem II may be appreciably greater in Anabaena azollae. Azolla chloroplasts were generally comparable to spinach chloroplasts.

A comparison of the chlorophyll a and b content of Azolla fronds with and without the symbiotic alga resulted in an estimate that in the symbiotic association, the Anabaena azollae accounts for from 7. National Center for Biotechnology InformationU. Journal List Plant Physiol v. Initial Characterization of the Association 1. Peters and Berger C. Author information Copyright and License information Disclaimer.

This article has been cited by other articles in PMC. Abstract Cultures of Azolla caroliniana Willd. Images in this article Image on p.

Photochemical activity and structural studies of photosystems derived from chloroplast grana and stroma lamellae. Delayed light studies on photosynthetic energy conversion. Identification of the oxygen-evolving photoreaction as the delayed light zzollae in mutants of Scenedesmus obliquus.


Fixation of phycobiliproteins to photosynthetic membranes by glutaraldehyde. Absence of photosystem 2 in heterocysts of the blue-green alga Anabaena. Cell differentiation and pigment composition in Anabaena cylindrica. Metabolic activities of isolated heterocysts of the blue-green alga Anabaena cylindrica.

Loss of photosynthetic activity in two blue-green algae as a result of osmotic stress. Difference spectra and extinction coefficients of P The Azolla, Anabaena azollae Relationship: The isolation of cell nuclei from rat brain. Purification and properties of unicellular blue-green algae xnabaena Chroococcales.

Azolla-Anabaena Relationships

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