Rhizobiales

Rhizobiales
Bartonella
Scientific classification
Kingdom:	Bacteria
Phylum:	Proteobacteria
Class:	Alpha Proteobacteria
Order:	Rhizobiales Kuykendall 2006
Families
Aurantimonadaceae Bartonellaceae Beijerinckiaceae Bradyrhizobiaceae Brucellaceae Cohaesibacteraceae Hyphomicrobiaceae 'Labriaceae' Methylobacteriaceae Methylocystaceae 'Methylopilaceae' Phyllobacteriaceae Rhizobiaceae Rhodobiaceae Xanthobacteraceae
Synonyms
Hyphomicrobiales

Hyphomicrobiales

The Rhizobiales are an order of Gram-negative Alphaproteobacteria.

The rhizobia, which fix nitrogen and are symbiotic with plant roots, appear in several different families. The four families Bradyrhizobiaceae, Hyphomicrobiaceae, Phyllobacteriaceae, and Rhizobiaceae contain at least six genera of nitrogen-fixing, legume-nodulating, microsymbiotic bacteria. Examples are the genera Bradyrhizobium and Rhizobium. Species of the Methylocystaceae are methanotrophs; they use methanol (CH₃OH) or methane (CH₄) as their sole energy and carbon sources. Other important genera are Bartonella (pathogen) and Agrobacterium (genetic engineering).

The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature and National Center for Biotechnology Information and the phylogeny is based on whole-genome sequences.

Brucella Meyer and Shaw 1920

Ochrobactrum Holmes et al. 1988

Bartonella Strong et al. 1915 (Approved Lists 1980) emend. Brenner et al. 1993

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