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Transport213-page6 - The plant central vacuole helps...

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Transport in Plants - 6 To Summarize: When the water potential inside the cell is higher than the environment, water will leave cells and plasmolysis results. This phenomenon is frequently observed in plants left in hot sunny windows and not watered adequately. It can be observed on the cellular level, too. Plasmolysis and Water Potential Turgor and Water Potential When the cell’s water potential is less than the environment, water will move into the cell until the water potential is equalized. The water pressure inside the cell results in turgor, which we have previously discussed, and is important to plant structure and strength for primary growth tissues. Most plant cells achieve turgor for their normal functioning state.
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Unformatted text preview: The plant central vacuole helps maintain turgor. The vacuole holds water and other substances that help maintain proton gradients within the cytosol. Maintaining water balance is critical to plants, just as it is to animals. Water Balance, Water Movement and Transpiration Water Loss Plants are 80-90% water (wet weight). Soil and atmosphere usually contain a much lower proportion of water (winter and spring in Puget Sound excepted) . Most plants present large surface areas to their surroundings; both the root and leaf surface areas are large: roots to absorb water and nutrients, leaves for exposure to sun for photosynthesis. Plants consume and lose much more water than we do, about 17 times as much....
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