Ultrastructure of Potato Spindle Tuber Viroid-Infected Tomato Leaf Tissue

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Abstract
Tomato leaves from healthy and potato spindle tuber viroid (PSTV)-infected leaves were fixed and processed for transmission electron microscopy. The ultrastructure of the cells of infected leaves showed 2 important variations from cells of healthy leaves. Tomato leaf cells infected by PSTV developed the paramural bodies known as plasmalemmasomes. These plasmalemmasomes were of different sizes and shapes and showed internal structural variations. Infected leaf cells showed aberrations of the thylakoid membrane system of the chloroplasts and the grana were not well developed. No differences were found in the numbers of starch grains or electron-dense osmophilic granules in infected and healthy plants.