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Many legumes have root nodules that provide a home for symbiotic nitrogen-fixing bacteria called rhizobia. This relationship is particularly common in nitrogen-limited conditions. The Rhizobia convert nitrogen gas from the atmosphere into ammonia, which is then used in the formation of amino acids and nucleotides .
Examples. 1  Rhizobia- Rhizobia are bacteria that conduct Nitrogen fixation for legume plants. 2  Mycorrhizae- Mycorrhizae are similar to rhizobia in that they interact with plants at their roots. 3  Arbuscula: found in non-woody and tropical plants.  Ectomycorrhiza: found in boreal and temperate 1  forests. Ericoid: found in species of the heathland.