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Rhizobia


Rhizobia are gram-negative bacilli that live freely in the soil (especially where legumes have been grown). However, they cannot fix atmospheric nitrogen until they have invaded the roots of the appropriate legume.
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Examples are nitrogen-fixing bacteria (called rhizobia) which live in root nodules on legume roots, single-celled algae inside reef-building corals, and bacterial endosymbionts inside several insect species.
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Rhizobia. Bacteria in a symbiotic relationship with leguminous plants that results in nitrogen fixation. See Nitrogen fixation. Rhizosphere. The soils region on and around plant roots. Ribozyme. See Catalytic RNA. Ribosomal RNA (rRNA).
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