1 / 12

Transport in Plants

This overview explores the fundamental transport mechanisms at the cellular level in plants, including passive and active transport, facilitated diffusion, and proton pumps. We discuss water potential (ψ), its components, and the effects of solute concentration and pressure on potential. The three compartments of vacuolated cells, transport pathways like apoplastic and symplastic routes, and the role of guard cells in gas exchange are also detailed. This comprehensive approach highlights how plants efficiently manage water and nutrient transport, including the vital processes of transpiration and phloem transport.

djepson
Télécharger la présentation

Transport in Plants

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related