9.2: Phloem Transport
- Created by: Katarinanokat
- Created on: 10-04-18 21:33
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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
- studied via aphids
- 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
- Active Translocation
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