Light and Electron Microscopy of the Intracellular Inclusions of Cauliflower Mosaic Virus

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Abstract
Summary The development and constitution of the inclusion bodies induced by Italian and Californian isolates of cauliflower mosaic virus was studied by light and electron microscopy. Cytochemical and enzyme-digestion tests revealed that the inclusion bodies are essentially proteinaceous, and contain RNA and some DNA. These inclusions have a matrix composed of densely packed, finely granular or fibrillar material and vacuole-like areas not bounded by a membrane. Virus particles are interspersed at random with the matrix and are not aggregated in regular crystalline arrays. The developmental sequence of the inclusions suggests that they are not merely structures for virus accumulation but, rather, that they are sites of virus synthesis and/or assembly.

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