Cross Index	Azotobacter
SuperSet	Prokaryote, Eubacteria, Gram-Negative Aerobic/ Microaerophilic Rods and Cocci
Compare	Acetobacter, Acidiphilium, Acidomonas methanolica, Acidothermus cellulolyticus, Acidovorax, Acinetobacter, Afipia, Agrobacterium, Agromonas oligotrophica, Alcaligenes, Alteromonas, Aminobacter, Aquaspirillum, Azomonas, Azorhizobium caulinodans, Azotobacter, Bacteroides, Beijerinckia, Bordetella, Bradyrhizobium japonicum, Brucella, Chromohalobacter marismortui, Chryseomonas luteola, Comamonas, Cupriavidus necator, Deleya, Derxia gummosa, Ensifer adherans, Erythrobacter longus, Flavobacterium, Flavomonas oryzihabitans, Francisella, Frateuria aurantica, Gluconobacter, Halomonas, Hydrogenophaga, Janthinobacterium lividum, Kingella, Lampropedia hyalina, Legionella, Marinobacter hydrocarbonoclasticus, Marinomonas, Mesophilobacter marinus, Methylobacillus glycogenes, Methylobacterium, Methylococcus, Methylomonas, Methylophaga, Methylophilus, Methylovorus glucosotrophus, Moraxella, Morococcus cerebrosus, Neisseriaceae, Neisseria, Oceanospirillum, Ochrobactrum anthropi, Oligella, Paracoccus, Phenylobacterium immobile, Phyllobacterium, Pseudomonas, Psychrobacter immobilis, Rhizobacter daucus, Rhizobium, Rhizomonas suberifaciens, Rochalimaea, Roseobacter, Rugomonas rubra, Serpens, Sinorhizobium, Sphingobacterium, Taylorella equigenitalis, Thermoleophilum, Thermomicrobium, Thermus, Variovorax paradoxus, Volcaniella eurhalina, Weeksella, Wolinella, Xanthobacter, Xanthomonas, Xyella fastidiosa, Xylophilus ampelinus, Zoogloea ramigera
Contrast	Archaea
Subset

 

Morphology

Azotobacter

CELLULAR

Staining	Gram negative
Morphology	large ovoid cells 1.5-2.0 um in diameter. Pleomorphic ranging from rods to coccoid cells. Occur singly, in pairs or irregular cllumps and sometimes in chains of varying length
Motility	some strains are nonmotile, otherwise motility occurs by peritrichous flagella
Specialized structures	do not form endospores but form cysts

Division

COLONIAL

Solid surface

Liquid

waer soluble and water insoluble pigments may be produced

 

Growth Parameters

Azotobacter

PHYSIOLOGICAL

Tropism	chemoorganotroph
Oxygen	aerobe but can grow is a microaerophile
pH	range 4.8-8.5 Optimum 7.0-7.5
Temperature
Requirements	Molybdenum is required for nitrogen fixation (may be replaced by vanadium)
Products	. Can use nitrate and ammonium salts ( all but one species) and certain amino acids as sources of nitrogen
Enzymes	catalase positive
Unique features	Nitrogen fixers; generally fix nonsymbiotically at least 10 mg of N2 per g of carbohydrate consumed

ENVIRONMENTAL

Habitat	soil and water . One species occurs in association with plant roots
Lifestyle
Pathogenicity

Distribution

 

Genome

Azotobacter

G+C Mol %

 

Reference

Azotobacter

First Citation	Beijerinck, M. W. 1901 Ueber oligonitrophile Mikroben. Zentralbl.Bakteriol. Parasitenkd. Infektionskr. Hyg. Abt II 7: 561-582
The Prokaryotes	p
Bergey's Systematic	p 220 Y-T. Tchan and P. B. New
Bergey's Determinative	p 77

References