Abstract
Ultrastructural localization of the plasmalemmal ATPase activity has been studied in basidiomycete ectomycorrhizas synthesized between Pinus sylvestris L, and Laccaria laccata Scop, ex Fries. The cortical cells showed a strong plasmalemma-bound ATPase activity. The activity was also associated with the fungal plasmalemma in the external hyphae, sheath and Hartig net. The plasmalemmal ATPase activity disappeared in degenerating cortical cells. In the Hartig net, only the parts of the plasmalemma adjacent to other hyphae were active. When the Hartig net hyphae adjoined on one side a living cortical cell and, on the other side, a dead cortical cell, the ATPase activity of fungus plasmalemma was asymmetrically distributed. These observations are discussed in relation to the possible function of ATPase in ectomycorrhizas.
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