10-Planttransportnotes

10-Planttransportnotes - T ransport in Plants Nutrient...

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Transport in Plants Nutrient uptake in plants What do plants need to grow? o Maintain water, nutrient, energy balance CO2 gas is exchanged along with O2 and H2O in leaves o Photosynthesis produces sugars from CO2 and H2O The roots take up minerals and H2O Where are water and nutrients needed within a plant? Uptake and transport There is a gas exchange in the leaves (CO2, H2O, O2) from the air Mineral (nitrate, phosphate) H2O is taken up from the soil o Transport H2O etc. from the roots to the leaves o There is a transport of sugars from the leaves to the roots The gas exchange is tied to transport The uptake and transport in plants rely on the unique properties of water such as: o Cohesion/adhesion o Osmosis
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Water potential Solute water potential: ψ s is a measure of the osmotic strength of a solution Solute concentration determines o Pure water has ψ s =0 o With an increase of solute concentration = lowers ψ s This allows the prediction of water directional flow (osmosis) Water moves from an area of high ψ s to an area of low ψ s Water potential regulates the movement of fluids in plants Water potential Figure 38.3
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Altering Ψ s The movement of water by plants is passive o There are no fluid “pumps” as in animals Therefore plants control the water flow by altering ψ s o Plants have ion pumps o Ion movement is an active transport o This changes relative ψ s in cells o By pumping the ions in the cells leads to the water to flow by osmosis Types of conducting tissue There are two types of conducting tissues
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Xylem: dead tissue which conduct water, ions o Vessels: are hollow cylindrical cells arranged end to end to form a continuous tube o Tracheids: hollow cylindrical cells tapered at ends overlapping to form continuous tubes Phloem: live tissue that conducts sugars o Sieve tube cells: hollow elongated cells with tapered ends Mechanisms of transport differs Transport figure 38.2
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This note was uploaded on 04/11/2011 for the course BIO 111 taught by Professor Dr. bos during the Winter '10 term at Purdue.

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10-Planttransportnotes - T ransport in Plants Nutrient...

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