Pseudomonadaceae
Colonies of Pseudomonas aeruginosa in a blood agar
The Pseudomonadaceae form a family within the Gammaproteobacteria. The members of this family, like all Proteobacteria Gram- negative. These are aerobic bacteria, they need oxygen to grow.
Within this family, the genus Pseudomonas is very diverse and contains bacteria of ecological and medical importance. Species such as Pseudomonas aeruginosa can be dangerous for people with weakened immune systems, sub-species of Pseudomonas syringae causing Tuberkelkrankheit the olive tree.
Metabolism
This species as " pseudomonads " designated family use many different materials as food, but they are not able to reduce substances by fermentation (called Nichtfermentierer or fermenters ). The Entner- Doudoroff pathway is a typical pathway of this group. The genera Azotobacter and Azomonas are also capable of nitrogen (N2 ) and to use for protein synthesis. Here they are among the free-living diazotrophs. Contrary to some other N2-fixing bacteria (such as the nodule bacteria ) they are not to rely on a symbiotic relationship with plants.
System
The following classes will be provided to the family Pseudomadaceae:
- Azomonas Winogradsky 1938
- Azorhizophilus Thompson & Skerman 1981
- Azotobacter Beijerinck 1901
- Cellvibrio ( Winogradsky 1929) Blackall et al. 1986
- Mesophilobacter Nishimura et al. 1989
- Pseudomonas Migula 1894
- Rhizobacter Goto & Kuwata 1988
- Rugamonas Austin & Moss 1987
- Serpens Goto & Kuwata 1988
The genera Azotobacter, Azorhizophilus and Azomonas also be summarized in the Azotobacter group ( Azotobacter group). Furthermore, Azotobacter and Azomonas be challenged by some authors in a separate family, the Azotobacteraceae (also written with i: Azotobacteriaceae ).