Info

Vesicles + + - - _ _ _ _ Arbuscules + _ _ _ ____ Coils _ + _ + + + _ + Pegs _ _ _ _ _ + _ Mantle _ + + + _ + _ Hartig net _ + + + _ + _

Fungal partners

Glomeromycetes

Zygomycetes, Ascomycetes, Basidiomycetes

Ascomycetes, Basidiomycetes

Basidiomycetes

Ascomycetes

Basidiomycetes

Basidiomycetes

Plant partners

Herbaceous plants, Shrubs,

Deciduous trees

Conifer trees, Some shrubs and deciduous trees

Conifer trees, Some shrubs and deciduous trees

Ericales, Pyrolaceae

Ericales, Bryophytes

Monotropaceae

Orchidaceae

FIGURE 10.1 (A) Intercellular hyphal colonization (arrow) and intracellular arbuscular colonization of Glycine max roots by an arbuscular mycorrhizal fungus. (B) Mantle and Hartig net hyphae of an ectomycorrhizal fungus (Truncocolumnella sp.) colonizing the intercellular space between the epidermal cells (C) of a pine root. (Image courtesy of Larry Peterson.)

FIGURE 10.1 (A) Intercellular hyphal colonization (arrow) and intracellular arbuscular colonization of Glycine max roots by an arbuscular mycorrhizal fungus. (B) Mantle and Hartig net hyphae of an ectomycorrhizal fungus (Truncocolumnella sp.) colonizing the intercellular space between the epidermal cells (C) of a pine root. (Image courtesy of Larry Peterson.)

using hyphal coils). Finally they penetrate cortical cells and form arbuscules (or arbuscules can form directly from hyphal coils), where most nutrient exchange is believed to occur. In EM, arbutoid, and monotropoid mycorrhizas, the fungus forms a fungal mantle over the surface of the root. Hyphae penetrate the root and proliferate within the intercellular space forming a Hartig net. EM fungal colonization is limited to these intercellular spaces, while arbutoid and monotropoid fungi further penetrate cells.

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