抄録
The resting spores of Olpidium brassicae in young root tissues of tobacco plants, observed in time sequence with a scanning electron microscope after freeze-fracturing, were first smooth spheres later developing ridges with pentamer and hexamer facets on the surface. Transmission electron microscope studies showed that the wall of mature resting spores consisted of three layers: inner, intermediate and outer. The cytoplasm was dense and contained many lipid-like bodies at the periphery. As individual zoospores developed fully, an exit tube containing membrane-bound vesicles was formed by the protrusion of the inner layer through the intermediate and outer layers of the wall. The result of computer image analysis supported these observations.
