2-22-10GuardCellsGraphs

2-22-10GuardCellsGraphs - BIOL13100 Biology II Development...

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BIOL13100 Biology II: Development, Structure, and Function of Organisms February 22, 2010 Dr. Nancy Pelaez Lilly G-224 [email protected]
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BIOL13100 Final Exam Wed May 5 from 3:20-5:20 pm in LAMB F101
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optional 1-credit WIKI-writing class Get a form for my signature from an advisor. Thursdays Lilly Hall of Life Sciences G431, Feb 22, 2010 - Apr 18, 2010 BIOL 19500 MEDICAL Investigations Biology 13100 (CRN 40229) 3 - 4:50 pm http://wiki.bio.purdue.edu/MedInvestigation BIOL 19500 BIOLOGICAL Investigations Biology II (CRN 40227) 6:00 pm - 7:50 pm http://wiki.bio.purdue.edu/biol13100
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Figure 37-4 Low water potential Leaf ψ : –0.8 MPa (Depends on transpiration rate; low when stomata are open) Atmosphere ψ : –95.2 MPa (Changes with humidity; usually very low) Root ψ : –0.6 MPa (Medium-high) Soil ψ : –0.3 MPa (High if moist; low if extremely dry) High water potential
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How do plants generate the negative pressure required to lift water to the tops of tall trees? It is done with microcapillarity. That is, an air-water interface with sufficiently small radius of curvature is generated on the surface of cells inside the leaf. This requires that water of the interior of the leaf be in a gas phase, maintained by constant evaporation via OPEN stomata. There must also be an unbroken column of water from the leaf down to the roots.
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Figure 36-16 Cross sections: Meristematic tissue Leaf Stem Meristematic tissue Root Vascular tissue system (red) Dermal tissue system (brown) Dermal tissue system (brown) Ground tissue system (gray) Ground tissue system (gray) Vascular tissue system (red) Shoot system Root system
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r c 0.05 uM 0.5 uM 0.01 uM P -3 MPa -0.3 MPa -15 MPa Average r c : 0.05 Average P: -3 MPa or -30 atm Remember, P = -2T/r c 30 atm pressure is sufficient
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leaves by stomata
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This note was uploaded on 02/22/2010 for the course BIO 135 taught by Professor ??? during the Spring '10 term at Purdue.

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2-22-10GuardCellsGraphs - BIOL13100 Biology II Development...

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