Scanning electron microscopy (SEM) of Eucalyptus pilularis roots inoculated with Pisolithus tinctorius, under controlled conditions, revealed altered morphogenesis of fungal hyphae in contact with the root surface. These changes occurred prior to the formation of a full fungal mantle and resulted in the formation of a compact fungal layer as a consequence of fusion of proliferating, branching hyphae. Although similar growth patterns have been observed in the inner mantle of fully developed ectomycorrhizae using contrast interference microscopy, this is the first time this feature has been observed during early mantle formation using SEM. Changes in fungal morphology during early stages of colonization may be correlated with recognition between the symbionts, and the subsequent establishment of a symbiotic relationship between compatible partners.
Jacobs, P. F.; Peterson, R. L.; and Massicotte, H. B.
"Altered Fungal Morphogenesis During Early Stages of Ectomycorrhiza Formation in Eucalyptus Pilularis,"
Scanning Microscopy: Vol. 3
, Article 26.
Available at: https://digitalcommons.usu.edu/microscopy/vol3/iss1/26