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Maintains stiffness of plant tissue, driving force for cell elongation
Maintains stiffness of plant tissue, driving force for cell elongation
Forums The Undercurrent it's literally just biology
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Water in hollow nonliving xylem cells (tracheids, vessel elements) is under negative pressure (tension)
Water in hollow nonliving xylem cells (tracheids, vessel elements) is under negative pressure (tension)
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Flaccid (limp, results from water loss) vs. turgid (firm, due to water uptake)
Flaccid (limp, results from water loss) vs. turgid (firm, due to water uptake)
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In water with high solute concentration (ѰS << 0) → water diffuses out of cell → plasmolysis
In water with high solute concentration (ѰS << 0) → water diffuses out of cell → plasmolysis
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In pure water (Ѱ = 0 MPa) → water enters cell by osmosis (due to higher solute concentration in cell) → cell swells, wall exerts turgor pressure (ѰP↑)
In pure water (Ѱ = 0 MPa) → water enters cell by osmosis (due to higher solute concentration in cell) → cell swells, wall exerts turgor pressure (ѰP↑)
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When ѰP and ѰS offset each other, Ѱ = 0 → equilibrium, no net movement of water
When ѰP and ѰS offset each other, Ѱ = 0 → equilibrium, no net movement of water
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Aquaporins (proteins) facilitate transport of water molecules across plant cell plasma membranes
Aquaporins (proteins) facilitate transport of water molecules across plant cell plasma membranes
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Diffusion is good enough for cells, but too slow for long-distance transport in a plant
Diffusion is good enough for cells, but too slow for long-distance transport in a plant
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Long-distance bulk flow - movement of liquid in response to a pressure gradient
Long-distance bulk flow - movement of liquid in response to a pressure gradient
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Occurs within tracheids and vessel elements (xylem) and sieve-tube elements (phloem)
Occurs within tracheids and vessel elements (xylem) and sieve-tube elements (phloem)
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Tracheids and vessel elements are dead and have no cytoplasm, and sieve-tube elements have no organelles → increases bulk flow rate
Tracheids and vessel elements are dead and have no cytoplasm, and sieve-tube elements have no organelles → increases bulk flow rate
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Perforation plates (vessel elements) and porous sieve plates (sieve-tube elements) also enhance bulk flow
Perforation plates (vessel elements) and porous sieve plates (sieve-tube elements) also enhance bulk flow
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Roots - epidermal cells are permeable to water, many are differentiated into root hairs
Roots - epidermal cells are permeable to water, many are differentiated into root hairs
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Having you as a Voltie would be awesome.