FIG. 1.

Transmission electron micrographs of mycelial samples, collected after 1 and 2 days of coculture of P. parasitica (Ph) and P. oligandrum (Po), in the region where the two fungi are interacting. (a) Hypha of P. parasitica encircled by hyphae of P. oligandrum. Structural changes are mainly characterized by an increase in the number of vacuoles (Va). Bar, 2 μm. (b) After 2 days, host cell disorganization is characterized by local retraction of the plasma membrane from the cell wall and by an early stage of cytoplasm (Cy) aggregation. A heterogeneous wall apposition (WA) is formed in the paramural space. Bar, 2 μm.