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Scientific classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Betaproteobacteria
Order: Rhodocyclales
Family: Rhodocyclaceae
Genus: Azoarcus
Reinhold-Hurek et al. 1993
Species: Azoarcus anaerobius
Azoarcus buckelii
Azoarcus communis
Azoarcus evansii
Azoarcus indigens
Azoarcus olearius
Azoarcus toluclasticus
Azoarcus tolulyticus
Azoarcus toluvorans
Type species
Azoarcus indigens

Azoarcus is a genus of nitrogen-fixating bacteria.[1] Species in this genus are usually found in contaminated water, as they are involved in the degradation of some contaminants, commonly habitating in soil. These bacteria have also been found growing in the endophytic compartment (inside the plant between the living cells) of some rice species and other grasses. [2]


  1. ^ Reinhold-Hurek, B.; Hurek, T.; Gillis, M.; Hoste, B.; Vancanneyt, M.; Kersters, K.; De Ley, J. (1993). "Azoarcus gen. nov., Nitrogen-Fixing Proteobacteria Associated with Roots of Kallar Grass (Leptochloa fusca (L.) Kunth), and Description of Two Species, Azoarcus indigens sp. nov. and Azoarcus communis sp. nov.". International Journal of Systematic Bacteriology. 43 (3): 574–584. doi:10.1099/00207713-43-3-574. ISSN 0020-7713. 
  2. ^ Raven Biology of Plants 8th Edition. Freeman

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