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rhizobia
Rhizobia are soil bacteria that fix nitrogen (diazotrophs) after becoming established inside root nodules of legumes (Fabaceae). In order to express genes for nitrogen fixation, rhizobia require a plant host; they cannot independently fix nitrogen. In general, they are Gram-negative, motile, non-sporulating rods.
== History ==
The first known species of rhizobia , ''Rhizobium leguminosarum'', was identified in 1889, and all further species were initially placed in the ''Rhizobium'' genus. However, more advanced methods of analysis have revised this classification, and now there are many in other genera. Most research has been done on crop and forage legumes such as clover, alfalfa, beans, and soy; recently, more work is occurring on North American legumes.
The word ''rhizobia'' comes from the Ancient Greek , ''rhíza'', meaning "root" and , ''bios'', meaning "life". The word ''rhizobium'' is still sometimes used as the singular form of ''rhizobia''
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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