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Some Ultrastructural Observations on the Host-Pathogen Relationship Within the Telial Gall of the Rust Fungus Gymnosporangium juniperi-virginianae

The bulk of a telial gall of Gymnosporangium juniperi-virginianae consists of loosely packed host parenchyma cells, each of which contains a large central vacuole filled with electron-dense material. Each cell also contains a conspicuous nucleus and the typical plant organelles. Host cells are surrounded by hyphae which may almost completely fill some intercellular spaces. Hyphae also grow through the middle lamella between adjacent host cells so that the hyphal wall contacts the walls of both cells. Haustoria of the fungus extend through the host cell wall in pitted areas where there are plasmodesmata and invaginate the plasma membrane. The haustoria are similar to those described for other rust fungi. The body of each haustorium is surrounded by a sheath that varies greatly in thickness. At higher magnification the sheath appears somewhat granular in nature. Necrotic haustoria encased by host cell wall material were also noted.