Pseudomonadaceae

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iPseudomonadaceae
Scientific classification
Kingdom: Bacteria Phylum: Proteobacteria Class: Gamma Proteobacteria Order: Pseudomonadales Family: Pseudomonadaceae Winslow et al., 1917
Genera
Azomonas Azotobacter Cellvibrio Mesophilobacter Pseudomonas Rhizobacter Rugamonas Serpens

Pseudomonadaceae is a family of bacteria that includes Pseudomonas,Commamonas, Cellvibrio, and the Azotobacter group. This group contains several named genera: Azomonas, Azorhizophilus, and Azotobacter. Many members of this group produce different derivatives of the flourecent pigment pyoverdine². The Azotobacteriaceae were recently published as belonging in this family as well¹.

According to Jay (2000) and Vela (1997), bacteria in the family Pseudomonadaceae are among the most important spoilage bacteria that originate in refrigerated raw milk. Jay (2000) also stated that they are considered psychrotrophs and grow well at temperatures of 0 to 15 degrees celsius.

Distinguishing characteristics of Pseudomonads: they are oxidase positive- this is due to the presence of cytochrome c oxidase enzyme, many metabolise glucose by the Entner Doudoroff pathway mediated by the following enzymes- 6 phosphoglyceraldehyde dehydrogenase and aldolase. The presence of oxidase, polar flagella and inability to carry out fermentation differentiate Pseudomonads from Enterobacteriaceae.

[edit] References

Note 1: Rediers H, Vanderleyden J, De Mot R. 2004. Azotobacter vinelandii: a Pseudomonas in disguise? Microbiology 150 (5), 1117-9.

Note 2: Meyer JM. 2000. Pyoverdines: pigments, siderophores and potential taxonomic markers of fluorescent Pseudomonas species. Arch Microbiol. 174(3):135-42.