The cyanobiont in an Azolla fern is neither Anabaena nor Nostoc

Abstract

The cyanobacterial symbionts in the fern Azolla have generally been ascribed to either the Anabaena or Nostoc genera. By using comparisons of the sequences of the phycocyanin intergenic spacer and a fragment of the 16S rRNA, we found that the cyanobiont from an Azolla belongs to neither of these genera. © 2003 Federation of European Microbiological Societies. Published by Elsevier B.V. All rights reserved.