Mycorrhizae (plural) are symbiotic relationships between fungal species and plant roots. In this association, the fungus typically inhabits part of the root zone of a plant and supplies nutrients from the soil to the plant in exchange for sugars.,Related Articles: Oregon Consumer ProtectionFrom Flask to Field: How Microbes are Revolutionizing Big AgricultureSoil Microbes and Fungi Improve Plant GrowthRelated Terms:Term: MacronutrientsTerm: Fungus