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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 .
A mycorrhiza is a symbiotic association between a fungus and the roots of a plant. In a mycorrhiza, the fungus lives inside the plant roots, and in the earth. The fungal hyphae are more efficient than plant roots at absorbing nutrients. Mycorrhizas are important for plant growth in many ecosystems. At least 80% of all land plant species have mycorrhiza. They depend on it for survival. They are the most common symbionts in the plant kingdom: they involve about 6000 species of fungi and 240,000 sp