Abstract
Numerous particles of tobacco mosaic virus (TMV) were found in plasmodesmata of mesophyll leaf cells of infected Nicotiana tabacum ; and of tobacco etch virus (TEV) in infected N. tabacum and Datura stramonium . As in N. tabacum infected with potato virus Y (PVY), the central plasmodesmatal structure, the desmotubule, was often seen, but in the presence of virus particles it was pressed to one side of the passage. Sometimes TEV particles in the plasmodesmata could be distinguished from lamellar inclusions only by examining serial sections. The presence of virus particles in plasmodesmata could be an artifact caused by release of hydrostatic pressure within the cells when the leaf tissues were sampled, but they were also plentiful in plasmodesmata when attached leaves of PVY-infected N. tabacum were either quick-frozen, or wilted, before sampling. Since long rigid particles of TMV and long flexuous particles of beet yellows virus, PVY, and TEV have now been found within plasmodesmata, these structures can be considered a probable route for elongated viruses to pass from cell to cell, as with isometric viruses.
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