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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 .
What They Are and A Few Interesting Facts. 1  Mycorrhizal fungi colonize the roots of many plants. 2  Mycorrhizal fungi dont harm the plant; on the contrary, they develop a symbiotic relationship that helps the plant be more efficient at obtaining nutrients and water.hat They Are and A Few Interesting Facts. 1  Mycorrhizal fungi colonize the roots of many plants. 2  Mycorrhizal fungi dont harm the plant; on the contrary, they develop a symbiotic relationship that helps the plant be more efficient at obtaining nutrients and water.