J.C. REVY, ISM / SCIENCE PHOTO LIBRARY J.C. REVY, ISM / SCIENCE PHOTO LIBRARY
Cell plasmolysis. Light micrograph of the epidermis in the bulb of a red onion Allium cepa, showing plasmolysis. The pigmented contents of each cell has shrunk after this tissue was placed in a salt (sodium chloride) solution. The concentrated (hypertonic) salt solution caused water to diffuse out of the cell cytoplasm, leaving empty spaces between cell contents and the cell walls. Compare this image with normal red onion epidermal cells (photograph: B060/058). Magnification: x200 at 35mm size.
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