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Rhizobiales is an order of alpha proteobacteria. They are Gram-negative. 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 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). == Phylogeny == 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 〔Collapsed from the tree built by (PATRIC ). Access date: 2012-05-02.〕 |label2= Phyllobacteriaceae |2= }} |label2= Rhizobiaceae |2= |2= }} }} |label2= Aurantimonadaceae |2= }} |label2=Hyphomicrobiaceae ''pro parte'' |2= }} |2= }} |2=''Kaistia'' Im ''et al''. 2005〔''Kaistia'' is currently included in Rhizobiaceae.〕 }} |2= |2= }} |label2= Xanthobacteraceae |2= }} |2= |2=''Methyloferula'' Vorobev ''et al''. 2011 }} |label2= Methylocystaceae |2= }} }} }} }} |label2= Hyphomicrobiaceae ''pro parte'' |2= }} |label2= Rhodobiaceae |2=''Parvibaculum'' Schleheck ''et al''. 2004 }} |2=''Meganema'' Thomsen ''et al''. 2006〔''Meganema'' is currently included in Methylobacteriaceae.〕 }} |2=''Sphingomonas'' Yabuuchi ''et al''. 1990 ''emend''. Yabuuchi ''et al''. 1999 (outgroup) }} }} 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rhizobiales」の詳細全文を読む スポンサード リンク
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