Name the nitrogen fixing bacteria found in atmosphere
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Rhizobia are diazotrophic bacteria that fix nitrogen after becoming established inside the root nodules of legumes (Fabaceae). 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.
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Free-living nitrogen-fixers include the cyanobacteria Anabaena and Nostoc and genera such asAzotobacter, Beijerinckia, and Clostridium
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