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Water potential & fl
For 330 Water potential and flow, many from Taiz & Zeiger 2002
Term | Definition |
---|---|
Bulk flow | Movement of groups of molecules en masse, most often in response to a pressure gradient; also referred to as , mass flow. |
Capillarity | Movement of water along a capillary tube due to surface tension; also known as caplary action. |
Diffusion | Net movement of particles from high to low concentration due to random thermal agitation. |
Flaccid cell | A plant cell having a turgor pressure near zero. |
Hydrogen bonds | Weak electrostatic attraction between water molecules. |
Matric potential | A component of water potential caused by the adhesion of water molecules to insoluble solids. |
Osmosis | Spontaneous net movement of solvent molecules through a semi-permeable membrane in the direction that tends to equalize the solute concentrations on the two sides |
Osmotic potential | The effect of dissolved solutes on water potential; also known as solute potential. |
Pressure potential | The positive hydrostatic pressure within cells; also referred to as turgor pressure |
Selectively permeable | Allows movement of water and other small uncharged substances more readily than the movement of larger solutes and charged substances; also known as semi-permeable. |
Solvent | Able to dissolve other substances. |
Surface tension | The attraction of molecules at the surface of a liquid. |
Transpiration | Water movement through stomata from plants to the atmosphere. |
Turgid cell | A swollen plant cell exerting positive pressure against the cell wall. |
Turgor pressure | Positive hydrostatic pressure within plant cells; also referred to as pressure potential. |
Water potential | The potential energy of water relative to pure water at standard conditions |