Transport in Plants - Western Oregon guralnl/gural/213Transport in  · Transport in Plants

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Transcript of Transport in Plants - Western Oregon guralnl/gural/213Transport in  · Transport in Plants

  • Transport in Plants

    I. Overview

    II. Absorption of water in Roots

    III. Transport of xylem sap

    IV.Control of transpiration

    V. Transport of phloem sap

  • I. OverviewTransport of solutes into the root

    Helps to create water movementSolutes= # of moleculesosmosis

  • Differences in water potential

    Three components Total water potential (w) Pressure potential (positive/negative) p Solute potential (s)

    w = p + sUnits are MPa

  • Water potential and movement

    Osmotic movement of wateraquaporins

  • Absorption of water in Roots

    Symplast = living tissueApoplast = cell wall space

  • Transport of xylem sapProperties of waterAdhesionCohesionTension

    Root Pressure

  • Ascent of Sap

    Transpiration-Cohesion-Tension Theory

    Solar driven Water potential of air Relative humidity

  • Control of transpiration

    Guard cells Photosynthesis-

    transpiration compromise

  • Mechanism of guard cell opening

  • Environmental control and adaptations

    Light (Blue light/Red light)

    Water (drought)

    Carbon dioxide (concentration in leaf/around leaf)

  • Adaptations

    Xerophytes CAM plants Leaf hairs Sunken stomata

  • Xerophytic Adaptations

  • Transport of phloem sap

    Source (photosynthetic tissue Sink (new leaves, seeds, roots Bidirectional flow Phloem Requires energy Transport of sugars (sucrose), amino

    acids, potassium, and hormones

  • Munch Pressure Flow Hypothesis