Evidence from the Cytology of Azotobacter chroococcum of a Relationship with Rhizobium and the Bacillaceae

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Abstract
Summary: The structure of the cell envelopes in Azotobacter chroococcum and the behaviour and mode of formation of the spore-like ‘cysts’ suggest that this organism has a close phylogenetic relationship with the Bacillaceae, and that accordingly the main genera of nitrogen-fixing bacteria, Azotobacter, Rhizobium, and Clostridium, have a relatively recent common origin.

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