Abstract
An electron microscopic study of Datura stramonium leaves inoculated with the physalis mottle strain (PMV) of belladonna mottle virus (BMV) revealed modifications of chloroplast structure. Numerous vesicles develop in chloroplasts 7 days after inoculation. A study of the latter at different stages after inoculation suggests that some part of PMV replication may take place within chloroplasts. Numerous vesiculations of the outer membranes of chloroplasts further suggest release of virus from plastids by way of these vesicles. Similar vesicles have been reported in plants infected with turnip yellow mosaic virus and wild cucumber mosaic virus, members of the tymovirus group, to which PMV may be allied. Crystalline aggregates of virions closely associated with chloroplasts and crystalline inclusions in nuclei were found in systemically infected leaf tissue.
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