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Vacuole

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Aside from storage, the main role of the central vacuole is to maintain turgor pressure against the cell wall. Proteins found in the tonoplast (aquaporins) ... Read more control the flow of water into and out of the vacuole through active transport, pumping potassium (K+) ions into and out of the vacuolar interior. Due to osmosis, water will diffuse into the vacuole, placing pressure on the cell wall. If water loss leads to a significant decline in turgor pressure, the cell will plasmolyze. Turgor pressure exerted by vacuoles is also required for cellular elongation: as the cell wall is partially degraded by the action of expansins, the less rigid wall is expanded by the pressure coming from within the vacuole. Turgor pressure exerted by the vacuole is also essential in supporting plants in an upright position. Another function of a central vacuole is that it pushes all contents of the cell's cytoplasm against the cellular membrane, and thus keeps the chloroplasts closer to light. Most plants store chemicals in the vacuole that react with chemicals in the cytosol. If the cell is broken, for example by a herbivore, then the two chemicals can react forming toxic chemicals. In garlic, alliin and the enzyme alliinase are normally separated but form allicin if the vacuole is broken. A similar reaction is responsible for the production of syn-propanethial-S-oxide when onions are cut. [citation needed]

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Plant Cell Vacuole  Vacuole

Plant Cell Vacuole

micro.magnet.fsu.edu

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vacuole jpg vacuole jpg  Vacuole

vacuole jpg vacuole jpg

c85c7a.medialib.glogster.com

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Vacuoles  like vesicles  Vacuole

Vacuoles like vesicles

www.phschool.com

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Animal Plant Cells  Vacuole

Animal Plant Cells

study.com

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engulfed by vacuoles until  Vacuole

engulfed by vacuoles until

faculty.muhs.edu

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Plant Central Vacuole  Vacuole

Plant Central Vacuole

study.com

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