Abstract
We studied the effect of Potato virus YNTN (PVY) on the cell ultrastructure of control (rooted control plants [C] and control plants grafted onto control rootstock [C/C]) and transgenic Pssu‐ipt plants overproducing cytokinins (CK; rooted [T] or grafted [T/C]). The PVY infection caused visible symptoms, i.e., reduction of leaf surface and plant growth, acceleration of leaf senescence, veinal necrosis, and leaf distortion in all infected C plants; in T and C/C plants, plant age affected whether symptoms of infection occurred. Even though DAS‐ELISA proved the presence of virus coat protein in all studied plants, the symptoms of infection were never observed in T/C plants. Relative content of virus proteins in cells correlated with the stage of symptom development in infected plants. A massive accumulation of virus proteins was found in the cytoplasm of infected plants, and it was proved by immunocytochemical methods. The most prominent effect of viral infection was a decrease of volume density of starch, an...
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