Cytoplasmic Cylindrical and Nucleolar Inclusions Induced by Potato Virus-A

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Abstract
Cytoplasmic cylindrical and lacunose nucleolar inclusions induced by potato virus-A (PVA) in cells of Nicotiana clevelandii were studied by EM and light microscopy. Differential staining with Azure A and Calcomine-Orange, Luxol Brilliant Green revealed that components of these inclusions were proteinaceous. Cylindrical inclusions appeared in thin sections of pinwheels, scrolls, and short, curved laminated aggregates (subdivision-IV type inclusions). Neither cytoplasmic nor nucleolar inclusions were observed in healthy cells. The nucleolar inclusions induced by PVA are distinctive and can be used to separate infections caused by PVA from those caused by other potyviruses.

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