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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 .
Lesson Summary. Mycorrhizae are a symbiotic association between a plant host root and a mycorrhizal fungus. Typically, the symbiosis is mutualistic, but can sometimes be parasitic. There are several types of mycorrhizal fungi, with the three most common being ectomycorrhizal fungi, arbuscular mycorrhizal fungi and ericacoid mycorrhizal fungi.