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The clear epidermal cells exist in a single layer and do not contain chloroplasts, because the onion fruiting body (bulb) is used for storing energy, not photosynthesis. [3] Each plant cell has a cell wall, cell membrane, cytoplasm, nucleus, and a large vacuole. The nucleus is present at the periphery of the cytoplasm.
Chloroplasts can be seen travelling around the central vacuole of a cell in Rhizomnium punctatum Cytoplasmic streaming in onion epidermal cell. Cytoplasmic streaming, also called protoplasmic streaming and cyclosis, is the flow of the cytoplasm inside the cell, driven by forces from the cytoskeleton. [1]
In onion epidermal cells, which are used as models to study anisotropy in extension, extension is pH dependent in both directions (transverse and parallel to cellulose orientation). Extension is also nearly three times higher at a pH of 4-5 than a pH of 6. This is a strong indication of acid growth in these cell wall samples. [2]
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Plasmolysis only occurs in extreme conditions and rarely occurs in nature. It is induced in the laboratory by immersing cells in strong saline or sugar (sucrose) solutions to cause exosmosis, often using Elodea plants or onion epidermal cells, which have colored cell sap so that the process is clearly visible.
Orange zoosporangium and tubinate cell of Cladochytrium replicatum growing on onion epidermis. Scientific classification; Domain: Eukaryota:
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Pages in category "Plant cells" The following 32 pages are in this category, out of 32 total. ... Onion epidermal cell; P. Palisade cell; Pavement cells; Phragmoplast;