Chapter 36

Chapter 36 - Chapter 36 Transport in Vascular Plants 1)...

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Chapter 36 Transport in Vascular Plants 1) Physical forces drive the transport of materials in plants over a range of distances a) Transport in vascular plants occurs on three scales i) Transport of water and solutes by individual cells ii) Short-distance transport of substances from cell to cell at the level of tissues and organs iii) Long-distance transport within the xylem and phloem March 24, 2008 1) Pulling Xylem Sap a) The Transcription-cohesion-tension mechanism i) Water is pulled upward over great distances by negative pressure (tension) in the xylem 2) Transcription Pull a) Transpiration: the evaporative loss of water from the leaves of a plant b) Water vapor in the air spaces of a leaf diffuses and exits the leaf via stomata c) This produces negative pressure in the leaf, which is transmitted to water in the xylem 3) Cohesion and Adhesion a) The transpirational pull is transmitted all the way from the leaves to the root tips and even into the soil b) Facilitated by cohesion and adhesion
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This note was uploaded on 02/04/2009 for the course BIOL 1202 taught by Professor Gregg during the Spring '08 term at LSU.

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Chapter 36 - Chapter 36 Transport in Vascular Plants 1)...

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