9.2: Phloem Transport

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  • Phloem Transport
    • Active Translocation
      • moves organic molecules from sources to sinks
      • in sap
      • Rate
        • studied via aphids
          • **** sap with stylets
        • sever stylet, sap flows and continues to flow (hydrostatic pressure)
        • sink = slow rate
    • Phloem Structure
      • sieve element cells make a tube
      • no nuclei
      • sieve plates allow porous flow
      • Rigid cell wall to withstand pressur
      • Companion cells
        • infolding membrane for SA
        • mitochondria
        • transport proteins
        • Plasmodesmata connects
    • Phloem Loading
      • active transport
      • pump h+ and co transport sucrose
    • Mass Flow
      • hypertonic source = osmosis
      • hydrostatic pressure
      • moves to low pressure (sink)
      • at sink sucrose metabolised so no osmosis

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