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Azorhizobium caulinodans

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An organism that forms nitrogen-fixing symbionts involved in the nodule formation of leguminous host plants particularly the species Sesbania rostrata.


Azorhizobium caulinodans genome composed of several genes that reflect a strong adaptive and metabolic potential and a plethora of regulatory-transporter genes involved in contacting the host. Its gene encodes 4717 proteins and an attractive organism to explore symbiotic biological nitrogen fixation.

Azorhizobium caulinodans is a member of Xanthobacteraceae family that shows unusual ability since it is able to grow in a free living state at the expense of dinitrogen as well as able to fix nitrogen symbiotically in the root and stem nodules of Sesbania rostrata a tropical legumes. It has a maximal nitrogenase activity under dissolved oxygen concentration.

Azorhizobium caulinodans is a diazotroph that get hold of the ability to nodulate most probably through the horizontal gene transfer of a complex symbiosis. It contains beta-1,4-N-acetylglucosamine oligosaccharide from which the N-acetyl group at the non-reducing end is re-established by fatty acids. It also has a radioactive uridine diphosphate-N-acetylglucosamine which shows the first step in biosynthesis.

Scientific classification:

Phylum: Proteobacteria
Class: Alphaproteobacteria
Order: Rhizobiales
Family: Xanthobacteraceae
Genus: Azorhizobium
Species: Azorhizobium caulinodans

See also:



Sesbania rostrata