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STRUCTURE AND PHYSIOLOGY OF ECTOMYCORRHIZAE
Author(s) -
NYLUND JANERIK,
UNESTAM TORGNY
Publication year - 1982
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1982.tb03293.x
Subject(s) - hypha , mycorrhiza , ectomycorrhizae , fungus , biology , botany , mycelium , penetration (warfare) , picea abies , ectomycorrhiza , symbiosis , biophysics , bacteria , genetics , operations research , engineering
SUMMARY The process of mycorrhiza formation in previously uninfected roots was studied in vitro , using the fungus Piloderma croceum Erikss. & Hjortst, and the Norway spruce, Picea abies (L.) Karst, as model organisms. The process could be divided into the following phases: fungal growth stimulation by root metabolites; formation of a hyphal envelope on the root; intercellular penetration by single hyphae, change in fungal morphology into labyrinthic tissue formation leading to Hartig net formation, and extension of labyrinthic tissue to form a mantle. P. croceum , growing in dead tissue, showed saprophytic growth in vitro , a capacity suppressed in living tissue. The way of fungal penetration appeared to be mechanical. A hypothetical model for host‐fungus interactions regulating the mycorrhiza infection process is also discussed.