Rhizobiales
Bartonella henselae ( dark particles ) in the heart valve of a human
The Rhizobiales form an order within the alpha proteobacteria. It is a phenotypically and metabolism concerning diverse group of bacteria based on their assignment 16S rRNA Gene sequences.
In some families nodule bacteria are found, the bacteria are able to fix nitrogen and form a symbiotic relationship with plants. This is especially to species of the genera Rhizobium and Bradyrhizobium. The Methylocystaceae family includes methanotrophic species use the methane as a sole carbon source for growth and development of the cell substance. Species of the genus Bartonella are dangerous pathogens, they can cause so-called Bartonellosen, this includes, for example, the triggered by Bartonella quintana Protect grave fever (also called five- day fever ). The genus Bartonella was once one of the family Rickettsiaceae the order Rickettsiales, based on analysis of 16S rRNA she was transferred in the order Rhizobiales.
Other important representatives are Azorhizobium, Nitrobacter, Brucella, Beijerinckia and Agrobacterium.
System
To order the Rhizobiales include the following families
- " Aurantimonadaceae "
- Bartonellaceae, with only one genus, Bartonella
- Beijerinckiaceae
- Bradyrhizobiaceae
- Brucellaceae
- Cohaesibacteraceae
- Hyphomicrobiaceae
- Methylobacteriaceae
- Methylocystaceae
- Phyllobacteriaceae
- Rhizobiaceae
- Rhodobiaceae
- Xanthobacteraceae