Abstract
Mitotic abnormalities were observed in a range of Solanaceous species infected respectively with tobacco mosaic virus and aspermy virus. These abnormalities ranged from persistence of the nucleolar material as far as early anaphase, in all cases observed, to a complete amitosis encountered in stem-enations of one species examined, viz. Petunia violacea. These findings are thought to support the view that virus particles, multiplying within dividing cells, compete with the nuclear-DNA for the supply of RNA located in the nucleolus.
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