Abstract
The first cytological symptom of infection of phloem parenchyma cells by potato virus M is the formation of clusters of endoplasmic reticulum cisterns in a cytoplasm containing numerous ribosomes. Randomly distributed PVM particles are found in the vicinity of the cisterns. As the infection progresses, inclusions made up of regularly arranged particles of PVM are formed.The cytoplasm of the cells becomes electron transparent because the ER cisterns disappear. Masses of homogenous substances containing single PVM particles appear. There are two types of deposits in the inclusions containing PVM virus particles - additionally coated particles and tubules.
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