The Hyphomicrobiales 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 (useful in genetic engineering).
Taxonomy
Accepted families
Unassigned Genera
The following genus has not been assigned to a family:
Provisional Taxa
These taxa have been published, but have not been validated according to the Bacteriological Code:
- "Nordella" La Scola et al. 2004[4]
- "Propylenellaceae" Liu et al. 2021[5]
- "Propylenella" Liu et al. 2021[5]
- "Propylenella binzhouense" Liu et al. 2021[5]
- "Thermopetrobacter" Sislak 2013[6]
Phylogeny
The currently accepted taxonomy is based on the List of Prokaryotic names with Standing in Nomenclature[7] and the phylogeny is based on whole-genome sequences.[2][a]
Hyphomicrobiales Parvibaculaceae
Hyphomicrobiaceae
Amorphaceae
Rhodobiaceae
Afifellaceae
Cohaesibacteraceae
Breoghaniaceae
Stappiaceae
Devosiaceae
Aurantimonadaceae
Ahrensiaceae
Notoacmeibacteraceae
Phyllobacteriaceae
Rhizobiaceae
Bartonellaceae
Phyllobacterium [b]
Brucellaceae
Tepidamorphaceae
Kaistiaceae
Pseudoxanthobacteraceae
Prosthecomicrobium [c]
Pleomorphomonadaceae
Blastochloridaceae
Xanthobacteraceae
Phreatobacteraceae
Nitrobacteraceae
Beijerinckiaceae
Roseiarcaceae
Methylocystaceae
Chelatococcaceae
Boseaceae
Salinarimonadaceae
Methylobacteriaceae
outgroups Rhodobacterales
Parvularculales
Caulobacterales
Natural genetic transformation
Natural genetic transformation has been reported in at least four Hyphomicrobiales species: Agrobacterium tumefaciens,[8] Methylobacterium organophilum,[9] Ensifer adhaerens,[10] and Bradyrhizobium japonicum.[11] Natural genetic transformation is a sexual process involving DNA transfer from one bacterial cell to another through the intervening medium, and the integration of the donor sequence into the recipient genome by homologous recombination.
See also
Notes
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^ Aestuariivirgaceae, Alsobacteraceae, Ancalomicrobiaceae, Lichenibacteriaceae, Lichenihabitantaceae, Rhabdaerophilaceae, and Segnochrobactraceae are not included in this phylogenetic tree.
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^ Phyllobacterium is separate from the rest of Phyllobacteriaceae.
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^ Prosthecomicrobium is separate from the rest of Hyphomicrobiaceae.
References
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^ 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.
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^ a b 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.
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^ Dong L, Han MX, Wang D, Liu F, Asem MD, Jiao JY, Xiao M, Salam N, Li WJ (2019). "Flaviflagellibacter deserti gen. nov., sp. nov., a novel member of the order Rhizobiales isolated from a desert soil". Antonie van Leeuwenhoek. 112 (6): 947–954. doi:10.1007/s10482-019-01228-0. PMID 30637538. S2CID 58006833.
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^ La Scola B, Barrassi L, Raoult D (2004). "A novel alpha-Proteobacterium, Nordella oligomobilis gen. nov., sp. nov., isolated by using amoebal co-cultures". Res Microbiol. 155 (1): 47–51. doi:10.1016/j.resmic.2003.09.012. PMID 14759708.
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^ a b c Liu YL, Meng D, Wang F, Gong XF, Gu PF, Fan XY, Du ZJ, Zou JD, Li Q (2021). "Propylenella binzhouense gen. nov., sp. nov. isolated from activated sludge, and proposal of Propylenellaceae fam. nov". Antonie van Leeuwenhoek. 114 (3): 225–233. doi:10.1007/s10482-020-01514-2. PMID 33400070. S2CID 230665484.
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^ Sislak CD (2013). Novel Thermophilic Bacteria Isolated From Marine Hydrothermal Vents (MSc). Portland State University. doi:10.15760/etd.1485. 1486.
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^ Euzéby JP, Parte AC. "Hyphomicrobiales". List of Prokaryotic names with Standing in Nomenclature (LPSN). Retrieved May 15, 2021.
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^ Demanèche S, Kay E, Gourbière F, Simonet P (June 2001). "Natural transformation of Pseudomonas fluorescens and Agrobacterium tumefaciens in soil". Applied and Environmental Microbiology. 67 (6): 2617–21. Bibcode:2001ApEnM..67.2617D. doi:10.1128/AEM.67.6.2617-2621.2001. PMC 92915. PMID 11375171.
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^ O'Connor M, Wopat A, Hanson RS (January 1977). "Genetic transformation in Methylobacterium organophilum". Journal of General Microbiology. 98 (1): 265–72. doi:10.1099/00221287-98-1-265. PMID 401866.
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^ Zuniga-Soto E, Mullins E, Dedicova B (2015). "Ensifer-mediated transformation: an efficient non-Agrobacterium protocol for the genetic modification of rice". SpringerPlus. 4: 600. doi:10.1186/s40064-015-1369-9. PMC 4628045. PMID 26543735.
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^ Raina JL, Modi VV (August 1972). "Deoxyribonucleate binding and transformation in Rhizobium jpaonicum". Journal of Bacteriology. 111 (2): 356–60. doi:10.1128/JB.111.2.356-360.1972. PMC 251290. PMID 4538250.
