title: Cyst and germ tube wall structure in Aphanomyces astaci, Oomycetes.
abstract: Aphanomyces astaci secondary cyst walls and walls of germinating spores were prepared by alkaline hydrolysis, autolysis, sonication, and enzymic degradation and were examined by shadow-casting and negative-staining techniques. The cyst wall consists of randomly oriented fibrils, about 3 nm in diameter. The fibrils are embedded in, or covered by, amorphous beta-1,3-glucans which can easily be removed by alkaline hydrolysis. The germ tube wall surface has the same structure, but the amorphous layer is less easily removed.
mesh_terms: D002473:Cell Wall / Q000648:ultrastructure; D005658:Fungi / Q000648:ultrastructure*; D005936:Glucans / Q000032:analysis; D009868:Oomycetes / Q000254:growth & development / Q000648:ultrastructure*; D013172:Spores, Fungal / Q000254:growth & development / Q000648:ultrastructure
chemical_list: D005936:Glucans