Abstract

The ectomycorrhizal fungus Pisolithus tinctorius interacts with roots of Picea mariana to form a typical mantle and Hartig net. Hyphae alter their growth pattern when in contact with susceptible root hairs in the mycorrhizal infection zone and grow acropetally, gradually covering the length of the hair to form a mantlelike structure. Initial contact with the hair may be influenced by a fibrillar material on the root hair surface. Although many root hairs become surrounded by fungal hyphae, they are not penetrated, and therefore are not entry points for this symbiotic fungus.

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