Lecture 27 Biology 2

Lecture 27 Biology 2 - Lecture 27, Transport in plants...

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Lecture 27, Transport in plants March 17, 2008 1 Chapter 36: Transport in Plants 1. Overview 2. Types of transport 3. Lateral transport of water and minerals by roots 4. Transport of xylem sap 5. The control of transpiration 6. Translocation of phloem sap Overview of transport in plants •Transport in plants occurs at three levels: Cells, tissues, organs •A variety of physical processes are involved in different types of transport Fig. 36.2 1 2 3 4 5 6 7 a. Cell : uptake and loss of water and solutes (Review Chapter 7: transport across biological membranes) Passive transport : diffusion across membrane (e.g., osmosis) Active transport : pumping of solutes across membrane (energy expended) Water potential : driven by solute concentration and physical pressure Transport proteins: such as aquaporins increase rate of water flow across membranes 2. Types of transport Fig. 7.9a
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Lecture 27, Transport in plants March 17, 2008 2 Osmosis = diffusion of water across a selectively permeable membrane (Ch. 7, p. 132) Water moves from solution with lower solute concentration to the solution with higher solute concentration Types of transport Water potential: combined effects of solute concentration and physical pressure (=“water’s potential energy”)
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Lecture 27 Biology 2 - Lecture 27, Transport in plants...

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