Abstract
Particles of wild cucumber mosaic virus (WCMV) were found in various concentrations in mesophyll cells of Marah oreganus. When low in concentration, virus particles were scattered in the ground cytoplasm. When particles were highly concentrated, crystalline aggregates occurred. Cells in an advanced stage of breakdown had lost their plasma membranes and virus particles occurred within chloroplasts, but were not in crystalline arrays. Chloroplasts contained numerous double membrane-bound vesicles, and single membrane-bound vesicles were present in the ground cytoplasm surrounding the chloroplasts. Similar vesicles have been reported in turnip yellow mosaic virus (TYMV)-infected cells. WCMV and TYMV are serologically related and similar in size and external morphology. They show a similar chloroplast pathology, although not in a common host, The diagnostic value of chloroplast vesicle formation is discussed.
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