According to horticultural researcher Fred Davies at Texas A&M University, US, most plants don't have roots, they have mycorrhizae. In healthy natural soils around 90 per cent of plant species form these symbiotic relationships with specific kinds offungi that grow in intimate contact with their root tissue. Indeed, many biologists now believe that such a relationship was essential in enabling plants to first grow on land 390 million years ago, and that roots evolved not primarily as anchors or to directly absorb water and minerals-but to interact with their fungi.
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