title: [Quantitative changes in the principal cell constituents of Entomophthora virulenta during sporogenesis].
abstract: Changes in the relative abundance of cell constituents of Entomophthora virulenta Hall & Dunn were studied during the various differentiation phases leading to the formation of zygospores. The highest total protein (43%) and nucleic acid (5.2% RNA and 0.2% DNA) concentrations were found in the exponential growth phase; these concentrations decreased regularly as the mycelium aged. The amount of lipids was four times larger at the prespore and spore stage (about 25%) than at the exponential mycelial stage. The zygospore contained a very high concentration of chitin (about 17%), three times more than the mycelial concentrations. However, the percentage of polysaccharides without chitin, but including glycogen, was higher in the deceleration phase mycelium (34%) than in the spore (25%). A physiological model of the sexual sporulation of E. virulenta based on these data has been presented.
mesh_terms: D002686:Chitin / Q000032:analysis; D004247:DNA / Q000032:analysis*; D004773:Entomophthora / Q000032:analysis* / Q000502:physiology; D005656:Fungal Proteins / Q000032:analysis*; D005658:Fungi / Q000032:analysis*; D008055:Lipids / Q000032:analysis*; D008954:Models, Biological; D011134:Polysaccharides / Q000032:analysis*; D012313:RNA / Q000032:analysis*; D013172:Spores, Fungal / Q000032:analysis
chemical_list: D005656:Fungal Proteins; D008055:Lipids; D011134:Polysaccharides; D002686:Chitin; D012313:RNA; D004247:DNA
vernacular_title: Variations quantitatives des principaux constituants cellulaires d'Entomophthora virulenta lors de la sporogénèse.