Ch 36-Transport in Plants-Outline

Ch 36-Transport in Plants-Outline - Chapter 36 Plants...

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Chapter 36
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Plants – review of the basics
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Review of plant tissue systems Dermal-epidermis, periderm Ground- parenchyma… Vascular-xylem and phloem
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Xylem Phloem Cells dead at maturity Water solution Cells alive at maturity Sugars and organic nutrients
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Pathways for Survival in vascular plants movement onto land involved evolution of roots and shoots such transport can occur over long distances Redwood tree Sequoia sempervirens Ex. Highest leaf is 300 ft. from roots
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Scale of transport in vascular plants Transport in vascular plants occurs on three scales: Individual cell : transport of water & solutes : short-distance transport of substances from cell to cell Whole plant : long-distance transport w/in xylem & phloem
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Selective Permeability of Membranes selective permeability of plasma membrane controls movement of solutes into and out of cell specific transport proteins enable plant cells to maintain an internal environment different from their surrounding CYTOPLASM ATP EXTRACELLULAR FLUID Proton pumps Proton gradient Creates a H + ion gradient = potential energy Proton pumps contributes to the voltage of membrane potential
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Transport of cations and anions Cations (Ex. K+) are driven into cell by membrane potential. CYTOPLASM EXTRACELLULAR FLUID Transport protein Anions transport (Ex. NO3 - ) involves coupling of passage of one solute to the passage of another (Ex. H + ) Carrier Proteins
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Cotransport of a neutral solute “coattail” effect of cotransport is also responsible for the uptake of the sugar sucrose (S) by plant cells
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Effects of Differences in Water Potential To survive, plants must balance water uptake and loss Osmosis determines net uptake or water loss by a cell Osmosis is affected by solute concentration and pressure Water Potential a measurement that combines effects of [solute] and pressure determines direction of water movement water flows from regions of higher potential to regions of lower potential Measured by Megapascals (MPa)
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This note was uploaded on 04/07/2008 for the course BIO 102 taught by Professor Doll during the Spring '08 term at Loyola Chicago.

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Ch 36-Transport in Plants-Outline - Chapter 36 Plants...

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