Figure 18.  Infection filaments form appressoria over plant epidermal cell junctions. In this image of a silk surface stained with the fluorochromes DAPI (to label nuclei) and Calcofluor (which labels cells walls) the host cell walls are barely visible as horizontal lines in the background. Two infection filaments with brightly stained, egg-shaped appressoria at their tips are visible; the arrow points out the paired nuclei in one. (Courtesy K.M. Snetselaar) BACK