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Transport in Plants

Transport in Plants. AP Biology Crosby High School. Transport at the Cellular Level. Overview of transport Passive Facilitated diffusion Selective channels Active Proton pumps K + enters cells Cotransport NO 3 - and Sugar. Differences in Water Potential. Water Potential ( ψ )

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Transport in Plants

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  1. Transport in Plants AP Biology Crosby High School

  2. Transport at the Cellular Level • Overview of transport • Passive • Facilitated diffusion • Selective channels • Active • Proton pumps • K+ enters cells • Cotransport • NO3- and Sugar

  3. Differences in Water Potential • Water Potential (ψ) • Ψ = ψs + ψp • Measured in MPa • Effect of Solute • As solute concentration increases, potential decreases • Effect of Physical pressure • As Pressure increases, potential increases

  4. Vacuolated Plant Cells have 3 Compartments • Compartments • Cell wall • Cytosol • Vacuole • Paths of transport • Apoplastic • Symplastic • Transmembrane

  5. Transport in Plants • Within tissue and organ • Apoplastic and Symplastic transport • Through plant • Bulk flow • Sieve-tube: Hydrostatic pressure pushes sap • Xylem: Transpiration creates tension

  6. Absorption of Water by Roots • Mycorrhizae • Fungi and Plant root • Endodermis is selective sentry • Casparian Strip • Symplastic bypasses Casparian Strip • Apoplastic must enter cell to get around

  7. Transport of Xylem Sap • Pushing: root pressure • Accumulation of minerals at night draws in H2O • Guttation • Pulling: transpiration-cohesion-tension • Transpiration pull • Cohesion pulls water • Adhesion fights gravity

  8. Guard Cells • Turgid: buckle out and open • Flaccid: Relax and close • K+ changes concentration and alters water potential • Cues for Stomata opening • Light • CO2 depletion • Circadian Rhythms

  9. Phloem Transport • Sugar source • Sugar is produced • Sugar sink • Sugar is used or stored • Loading and Unloading • Loading requires active transport • Unloading is passive

  10. Guard Cell Changes

  11. Endodermis

  12. Water Potential Analysis

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