10.26.05 - Lecture 26 Transport Systems in Plants Problems...

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Lecture 26 - Transport Systems in Plants Problems: 1) Get the sugar from the leaf (where its produced) to the roots (source tissue --> sink tissue) Phloem - Sugars, AAa, source --> sink Xylem - Water, Nutrients Ψ = ΨP + ΨS Concentration of water is 55.5M H20 Mix in a concentration of sucrose if 0.06 sucrose, concentration of water is 54.7 This creates a concentration & water potential gradient, which the water flows down Apoplastic – nonliving cell walls, air spaces, exylem vessels. Root Pressure - xylem vessels - endodermal cells – plants lay down a barrier called the casparien strip - casperian strips allow us to generate pressure in xylem by dumping ions into xylem - this can generate up to 0.1 MPa, which is 1 atm, which is 760 mm Hg. (Very his considering most humans have 80 – 120mm Hg). - Plants can deal with these high pressures because theu have cell walls. - 1 atm will get you about 30 ft (10 m). - It costs ATP to make the pressure gradient, but beneficial cuz you can get water and minerals up to the leaves.
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