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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 .
Making the world better, one answer at a time. Almost 80% of plants with roots participate in mutualistic symbiosis with fungus. Mycorrhiza, a âfungus rootâ, forms haustoria, the portion of the parasitic fungus which penetrates the root systems of other plants in order to intercept the nutrients going into the plant.aking the world better, one answer at a time. Almost 80% of plants with roots participate in mutualistic symbiosis with fungus. Mycorrhiza, a âfungus rootâ, forms haustoria, the portion of the parasitic fungus which penetrates the root systems of other plants in order to intercept the nutrients going into the plant.