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BIOA01H3 (202)
Chapter 35

Chapter 35 (Fall2010)

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Biological Sciences
Mary Olaveson

BIOA01FALL2010 Chapter 35 Transport in Plants 351 How do plants take up waterSolute potential of a solution is a measure of the effect of dissolved solutes on the osmotic behaviour of the solutionThe greater the solute concentration the more negative the solute potential and the greater the tendency of water to move into it from another solution of lower solute concentrationThe two solutions need to be separated by a selectively permeable membranePressure potentialhydraulic pressureas more water eneters it increasesWater potential the overall tendency of a solution to take up waterBulk flow the movement of a solution due to a difference in pressure potential between two parts of a plant Aquaporins membrane channel proteins through which water can move without interacting with the hydrophobic environment of the membranes phospholipid bylayerApoplast consists of the cell walls which lie outside the plasma membranes and the intercellylar spaces that are common to many tissues The apoplast is a continuous meshwork through which water and dissolved substances can flow or diffuse without ever having to cross a membrane Movement of materials through the apoplast is thus unregulated until it reaches the Casparian strips of the endodermisSymplast passes through the continuous cytoplasm of the living cells connected by plasmodesmata The selectively permeable membrane of the root hair cells control access to
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