. Cytology. Cytology. . V V \ / Figure 5-5. Electron Micrograph Showing Early State of Cell Plate Formation in Telophase of Dividing Onion Root Tip Cell. A small portion of each telophase nucleus is seen at the upper right and lower left. The de- veloping cell plate extends diagonally from lower right to upper left. Mem- brane elements of the endoplasmic reticulum with evidence of branching are present on both sides of the cell plate. In the immediate vicinity of the cell plate the elements of endoplasmic reticulum are shorter and form a reticula- tion composed of a close lattice of tubules al
. Cytology. Cytology. . V V \ / Figure 5-5. Electron Micrograph Showing Early State of Cell Plate Formation in Telophase of Dividing Onion Root Tip Cell. A small portion of each telophase nucleus is seen at the upper right and lower left. The de- veloping cell plate extends diagonally from lower right to upper left. Mem- brane elements of the endoplasmic reticulum with evidence of branching are present on both sides of the cell plate. In the immediate vicinity of the cell plate the elements of endoplasmic reticulum are shorter and form a reticula- tion composed of a close lattice of tubules along the midline between the two cells. Phragmosomes are seen concentrated on either side of the plate region. Development of the cell plate is more advanced at the center (the early phragmoplast) and grades out toward the margins, where fewer cyto- plasmic elements are present. (From Porter, K. R. and Machado, R. D., 1960. "Studies on the Endoplasmic Reticulum. IV. Its Form and Distribu- tion During Mitosis in Cells of Onion Root Tip," J. Biophys. Biochem. Cytol., 7, Fig. 16, Plate 94. Courtesy of Dr. Keith R. Porter, The Rockefeller Institute.) MITOSIS AND MEIOSiS / 125. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wilson, G. B. (George Bernard), 1914-; Morrison, John H. (John Herbert), 1927-. New York, Reinhold
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