Abstract
Crystal-containing cells (C-cells) are widely spread in plant tissues; however, the origin of the crystals and their functions remain a subject of discussion. In sugar beet leaves, the membrane vesicles seen in an electron microscope appear in the cytoplasm and penetrate the vacuole by pinocytosis with the participation of tonoplast. In a light microscope, the vesicles fluoresce like crystals in C-cells. These crystal vesicles also fill the C-cells. The content of crystal vesicles is electron-transparent at all stages of leaf development. It is suggested that both individual crystal vesicles in the cytoplasm and in vacuoles and their agglomerations in C cells, vascular bundles, and epidermal cells are lytic compartments. Later, true crystals seem to be formed.
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