Figure 10.

Immunogold labeling using a PaIDS1 polyclonal antibody applied to stem sections of P. abies that had been treated with the fungus C. polonica. Gold particles were observed only in epithelial cells (ec) lining the inner surface of traumatic resin ducts (TRD), which contain induced oleoresin, and not in the remaining xylem cells, including the ray channel (rc), a site of primary oleoresin secretion (top). The antibody serum did not generate any labeling above the background signal in tissue treated with preimmune serum only (bottom picture).