Folia Parasitologica 38[3] 255-259 (1991)
COLONIZATION OF ASCARIS-LUMBRICOIDES EGGS BY THE FUNGUS VERTICILLIUM-CHLAMYDOSPORIUM GODDARD
- LYSEK, H (reprint author), PAL UNIV, FAC MED, PARASITOL LAB, HNEVOTINSKA 3, CS-77515 OLOMOUC, CZECHOSLOVAKIA
The process of colonization of Ascaris lumbricoides eggs by the fungus Verticillium chlamydosporium was studied by scanning electron microscopy. The preparations were made by fractionation of egg suspension exposed to the fungus for four days and frozen in liquid nitrogen according to Sterba and Milacek (1986). Ovicidal fungus forms an abundant ramifying mycelial network in the area between the eggs. However, egg-shells are penetrated only by some hyphae without any penetration organs produced (simple hyphal penetration). In a liquid medium, after penetration, hyphae inside the eggs rapidly grow among inner structures of egg-shells and on the surface of developing larvae. In the next phase, hyphae colonize the developing larva. The eggs attacked by this fungus remain morphologically unchanged for a long time except the sites of penetration. Verticillium chlamydosporium is a fungus with unique ovicidal properties. It colonizes the eggs of Ascaris lumbricoides at all stages of embryo development and also attacks larvae inside the eggs.
Published: September 1, 1991 Show citation
