Figure 12.  Following (A) zoospore encystment, (B) the stachel is routed via an adhesorium, (C) through the zoospore-host interface, resulting in the transfer of cell contents into the host. Note the role of the vacuole in the process. (Courtesy J.R. Aist & P.H. Williams, diagrams based on Plasmodiophora brassicae, but the process in Polymyxa is very similar) Ad=Adhesorium; CW=Cyst wall; FAM=Fibrillar adhesive material; HC=Host cytoplasm; HW=Host wall; L=Lipid body; P=Plug; Pa=Papilla; PC=Parasite cytoplasm; St=Stachel; V=Vacuole of cyst BACK