title: [Biodegradation of the mycelium of Pyrenochaeta lycopersici Schneider et Gerlach in the soil. Ultrastructural study].
abstract: Under natural conditions, Pyrenochaeta lycopersici forms a sterile mycelium. Some strains form chlamydospores, while others form micro-sclerotia. The fungus survives by hyphae cells which are present in soil either free-living or momentarily protected by the tissue of the infected root. In a model experiment, the behaviour of the free mycelium was tested in a soil which had been supplied with asparagine and manure, respectively. A known quantity of living mycelium was added to the prepared soils. Samples were taken after 1, 3, 6, and 10 months. They were examined on loss of weight of the mycelium, inoculum potential, and ultra-structure of the hyphae before and during degradation by transmission electron microscopy.
mesh_terms: D001673:Biodegradation, Environmental; D003904:Mitosporic Fungi / Q000254:growth & development* / Q000648:ultrastructure; D012988:Soil Microbiology
vernacular_title: Biodegradation du mycelium de Pyrenochaeta lycopersici Schneider et Gerlach dans le sol. Etude ultrastructurale.