Abstract
Two types of inclusions readily detectable under light and electron microscope were found in cells infected with strains Yp and Ynt of the potato virus Y besides the characteristic lamellar inclusions, present in tissues invaded with viruses of this morphological group. The first is an intranuclear isometric crystal, related to the nucleolus, and more conspicuous in later phases of infection. The other, found in the cytoplasm of the cell of all the plants, infected with both strains so far examined, is membranous in nature. It is composed of a pile of closely packed, 10-50 large cisternae, usually bowl shaped. It is suggested that this structure derives from a hypertrophy of the dictyosomes of the Golgi complex.
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