Abstract
Beet mosaic virus (Potyvirus group ) induced two types of inclusion bodies in the chloroplasts of the cells of epidermal tissue of sugar-beet. The crystalline type of inclussions having six-edged form is the largest one and it is of the higher electron density(Pig. 1. ). The size of their edges is depended on the angle section and it is changing from 0, 33μ to 1, 5μ. The quantity of them is constant. Comparasion of large number of sections gives us the oppotunity to suppose that these inclusions in three-dimensional measuring present itselves in a form of six-edged prism, oriented along the length of the chloroplasts. Exceptions may also take place. There are met crystalls with 4-5 edges.The largest inclusion bodies copy the form of the external membrane of chloroplasts and have rounded forms or protuberant edges. (Fig. 2. ). Crystals are devided from the stroma of chloroplast with the help of single membrane (M) placing near the edges. In large magnifications in longitudinal sections of the crystals a striation(with periodicity of 7, 4 nm) is revealed. In cross sections they have lattice structure.
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