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The characteristics, occurrence, arid distribution of dilated cisternae (DC) of the rough endoplasmic reticulum (r-ER) in different plant organs of 24 species from three Rhoeadales families were examined by transmission electron microscopy. A typical cisterna originates from a dilation of the r-ER and contains a homogeneous, moderately dense material. The appearance of the cisternal content varies with the development of the cell and ranges from an electron-dense homogeneous matrix, via accumulations consisting of tightly packed longitudinally oriented rods or tubules, to vacuolar-like inclusions which eventually lose the attached ribosomes. The occurrence of DC was followed up in detail in different parts of the seedlings of Chinese cabbage (Brassica chinensis L.) 24 h, 48 h, and 72 h after germination. DC were not found in meristematic cells or cells undergoing differentiation, but appeared in more mature cells. Their number and size increased with the age and the development of the cell. DC were found in the roots of all Brassicaceae species examined and could also be observed in two genera of Papaveraceae and Resedaceae as well as in protoplasts and microcalli. In young Brassicaceae plants which had developed the first permanent leaves, DC had, with a few exceptions, disappeared from the tissue in stems and leaves. The relationship of DC to myrosin cells and myrosinase is discussed.
Israel Journal of Plant Sciences – Brill
Published: Apr 12, 1989
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