Inclusions in Hair Cells of Leaves of Tobacco Infected with Tobacco Mosaic Tobamovirus
Members of the Tobamovirus group induce different types of inclusion bodies, ranging from crystals and paracrystals to amorphous granular structures, also called X-bodies. The crystals appear in their ideal form as hexagonal plates, when viewed from a certain angle, but often they fall apart and a large number of fragments are observed in the cells. The hexagonal plates consist of regularly arranged virus particles. In young infections, X-bodies may also be observed, whereas the paracrystals, often appearing as long, needle-shaped structures, are more common in older infections. Inclusions are usually observed best in the epidermis or epidermis-derived structures, such as trichomes (hairs).
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