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Transport Processes (Water Potential (Osmotic poential (Effect that…

- - - - Except relatively dry materials
    - - Cell Membranes
      - Soil Particles
      - Cell Walls
  - - - After incipient plasmolysis
- - - - On outer surface
    - - Also in glands that secrete salt
      - In areas that pass nutrients in embryo
      - In regions where sugar is loaded in/out of phloem
- - - - Allow all solutes to diffuse through them
      - Little biological significance
    - - Do not allow anything to pass through
      - Occur as isolation barriers
    - - Also known as deferentially permeable membranes
      - Allow certain substances to pass through
  - - - Osmosis
- - - - Most widely accepted model of process
      - Stomatal pores open
        
        Unavoidably allow water loss
    - - Water loss directly through cuticle
      - Herbaceous and woody plants
    - - Water loss through humidity
      - At about 50%
      - Cuticle waxes epidermal surfaces
    - - Hydrogen bonding and water column breaks
      - Water column acts just like broken cable
    - - Also known as an air bubble
      - Expands until surface encounters solid barrier
        
        Like Pit membrane
  - - - Water molecules interact with other substance molecules
      - Water also adheres to soil particles
      - Almost all substances in plants interact with water
        
        Except lipids
    - - Strongly bonded when frozen
      - 2 water molecules interact
      - weakly bonded when as water
      - Force acts on neighbor cells
- - - - Excluding water
    - - Mass transfer divided by cross-sectional area
      - Area of Phloem
    - - Site that receive transported phloem sap
      - they are extremely diverse
      - Storage organs are important
  - - - Sugars
      - into sieve tube members
    - - Leaves are dominant in spring/summer
      - Site from water and nutrients are transported
    - - Loads phloem
      - conducting cell plasma membrane
        
        Permeable to
        
        Disaccharides
        
        Not polysaccharides
        
        Monosaccarhides