L15 Transport II

L15 Transport II - 1. TransportinplantsI:Chapter10 2.

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Review of Lecture 14 1. Transport in plants I: Chapter 10 2. Mechanisms used to move substances into and  out of cells 3. Principles of water movement a) Crossing a membrane b) Aquaporins c) Turgor Pressure d) Water Potential
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Transport in Plants 1. Molecules can move through ‘living’ space (the interior  of cells bounded by the plasma membrane and includes  the  phloem ) Symplastic transport 2. Molecules can also move through the space surrounding  the  protoplasts (external to the plasma membrane and  includes the xylem ) Apoplastic transport  
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Transport in Plants Chap.10, pg.215
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Principles of Water Movement Water is the solvent in living cells 1. Movement of water is governed by 3 basic  processes, a) Bulk flow b) Diffusion c) Osmosis
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Turgor Pressure Contributes to Cell Stiffness 1. The plant cell wall counters  the internal pressure caused  by water in the cell ( turgor pressure ) 2. For plant cells to grow,  water content must increase  but cell walls must also  expand Cell wall Plasma membrane Vacuole Pressure  due to water Cell wall
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Osmotic Potential The tendency of water to diffuse across a membrane The pressure applied by the piston is a quantitative  measure of the osmotic potential of the solution ©Raven, Evert and Eichhorn, Biology of Plants, 6th edition
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Ψ w Ψ π Ψ P Ψ equals water potential Ψ π equals osmotic potential ( Ψ o in text) Ψ p  equals pressure potential (the effect of cell wall pressure, or  turgor pressure) Water Potential ( Lab#8)
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1. Pressure potential is always a positive number (in  essence, the cell wall cannot  exert a negative pressure) 2. Osmotic potential is always zero or a negative number 3. For most living plant cells, the water potential is either  negative or zero 4. If the water potential is negative, the cell has more  capacity to take up water Water Potential  Ψ
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The challenges 1. Harvesting light energy 2. Staying wet when things get dry 3. Dealing with gravity 4. Divide or be conquered  5. Leveraging resources
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Lecture 15 Outline Transport in Plants II: Chapter 10 1. Characteristics of Water 2. Water Potential 3. Plant Nutrition 4. Soil Characteristics and Nutrient Acquisition
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Overview of Water and Solute Transport Chap.10, pg.220
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Transpiration The  design of xylem tissues  and the  polar nature of water  facilitate transport of water  upward through the plant Chap.10, pg.222
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Characteristics of Water Adhesion : the attraction  between different kinds of  m olecules (m ost im portant) Cellulose walls adhere to the water  molecules thereby binding and  supporting tiny segments of the  water column
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Characteristics of Water Cohesion : the attraction  between m olecules of the 
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This note was uploaded on 12/23/2010 for the course BIOL 120 taught by Professor Chuong during the Spring '09 term at Waterloo.

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L15 Transport II - 1. TransportinplantsI:Chapter10 2.

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