The Role of Roots
Symbiotic Soil Fungi
Symbiotic soil fungi attached to plant roots also function better when their hosts supply them with more photosynthetically-produced substances, as nearly all plants typically do in CO2-enriched air. These fungi then repay their hosts by supplying them with extra water and nutrients. They also produce hormones that further stimulate root growth; and they help to protect their hosts from toxic materials in the soil and from soil-borne plant pathogens.
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