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Cells160-page16 - unwanted munching by predators • Stored...

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Cell - 16 Central Plant Vacuole All living, mature plant cells have a large membrane bounded organelle, filled with fluid, called the Central Plant Vacuole. The central vacuole occupies as much as 90 - 95% of the volume of the mature cell. The membrane of the vacuole is called the tonoplast. The tonoplast is poorly permeable to water and water soluble materials. Functions of the Central Plant Vacuole Stores metabolic products including: many ions and nutrients, such as glucose, amino acids, potassium and chlorine the plant's water soluble pigments (the anthocyanins, including the beet pigment, betacyanin) toxic substances secondary metabolites and, some of which serve to defend the plant against
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Unformatted text preview: unwanted munching by predators • Stored substances in the vacuole attract water that increases fluid pressure within the vacuole. This pressure is known as turgor pressure and is important in increasing plant cell size and surface area during cell growth. This pressure also forces the cytoplasm against the plasma membrane and cell wall, helping to keep the cell rigid, maintaining a condition of turgor. Turgor provides support and strength for herbaceous plants and other plant parts lacking secondary cell walls. When plant cells lose turgor, they wilt, a condition known biologically as plasmolysis. "Permanent wilt" is a botanical euphemism for death....
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