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7. Transport in Plants

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  1. 7.1 Structure of Transport Tissues

    1. 7.1.1Plan diagrams of transverse sections

      • Plan diagrams of transverse sections: stems, roots, leaves (herbaceous dicots)

    2. 7.1.2Xylem and phloem distribution

      • Distribution of xylem and phloem in transverse sections

    3. 7.1.3Xylem and phloem cell drawings

      • Draw and label: xylem vessel elements, phloem sieve tube elements, companion cells

    4. 7.1.4Structure and function

      • Relate structure to function

  2. 7.2 Transport Mechanisms

    1. • Mineral ions and organic compounds transported dissolved in water

    2. • Water transport from soil to xylem: - Apoplast pathway: reference to lignin and cellulose - Symplast pathway: endodermis, Casparian strip, suberin

    3. • Transpiration: evaporation from leaf internal surfaces, diffusion to atmosphere

    4. • Hydrogen bonding in water movement: - Cohesion-tension in transpiration pull - Adhesion to cellulose in cell walls

    5. • Xerophytic plant adaptations to reduce water loss

    6. • Assimilate transport: sucrose and amino acids from sources to sinks in phloem

    7. • Companion cells transfer assimilates: proton pumps, cotransporter proteins

    8. • Mass flow in phloem: hydrostatic pressure gradient from source to sink