History
The first 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 ῥίζα, rhíza, meaning "root" and βίος, bios, meaning "life". The word rhizobium is still sometimes used as the singular form of rhizobia
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