Back مستجذريات Arabic مستجذريات ARZ Rizobial Catalan Hyphomicrobiales German Rhizobiales Spanish Hyphomicrobiales French Rhizobiales GL リゾビウム目 Japanese Rhizobiales Ukrainian Gifomikrobiyallar UZ
| Hyphomicrobiales | |
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| Agrobacterium (SEM image) | |
Scientific classification 
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| Domain: | Bacteria |
| Phylum: | Pseudomonadota |
| Class: | Alphaproteobacteria |
| Order: | Hyphomicrobiales Douglas 1957 (Approved Lists 1980) |
| Families[1] | |
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See text | |
| Synonyms[2] | |
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The Hyphomicrobiales (synonom 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 Nitrobacteraceae, Hyphomicrobiaceae, Phyllobacteriaceae, and Rhizobiaceae contain at least several 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 the human pathogens Bartonella and Brucella, as well as Agrobacterium, an important tool in genetic engineering.
- ^ Parker CT, Garrity GM (1 January 2003). Parker CT, Garrity GM (eds.). "Taxonomic Abstract for the families: Mabikibacteraceae". The NamesforLife Abstracts. NamesforLife, LLC. doi:10.1601/tx.30673.
- ^ Hördt A, López MG, Meier-Kolthoff JP, Schleuning M, Weinhold LM, Tindall BJ, et al. (2020). "Analysis of 1,000+ Type-Strain Genomes Substantially Improves Taxonomic Classification of Alphaproteobacteria". Frontiers in Microbiology. 11: 468. doi:10.3389/fmicb.2020.00468. PMC 7179689. PMID 32373076.