MYCORRHIZAE IN CONTAINER PLANT PRODUCTION
Charles R. Johnson
Mycorrhizae refers to a symbiotic association between a nonpathogenic or weakly pathogenic fungus and living cells of plant roots. Most all plants of the world are mycorrhizal, although wetland rice, cypress, and many plants in the Chenopodiaceae and Cruciferae are not mycorrhizal (1,2,6).
Mycorrhizae are categorized into three major groupings: ectomycorrhizae, endomycorrhizae, and ectendomycorrhizae. Ectomycorrhizae are predominantly found in association with coniferous trees, and the fungi that form them have above-ground mushroom fruiting bodies. These disseminate small air-borne spores. They form a thick covering on roots called a mantle, which is essentially an accumulation of mycelium. The most common forms of endomycorrhizae are vesicular-arbuscular (VA) mycorrhizae, which form
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