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signaling in plants (classes of plant hormones (growth promoting (auxin…

- - - - any chemical that promotes coleoptile elongation
      - indoleacetic acid (IAA) - common auxin (what auxin refers to in this lec)
      - auxin transporter proteins move it from basal end of one cell to apical end of the next
      - only one direction in shoot - tip to base - no tip, no response - (Re: Blue light -> phototropic response)
      - only certain conc func in cell elong
      - acid growth hypothesis
        
        proton pump lowers pH in cell wall
        
        expansins activated- separate microfibrils... breaks H bonds
        
        cell can elongate
        
        more (-) in cell, ions move in
        
        water moves in, incr turgor pr
      - **herbicide, rooting hormone- adventitious roots
      - apical dominance
    - - promote cell division
      - promoted in roots and endosperm
      - transported in xylem
      - opposes auxin action
      - stim embryo devel
      - delay tissue aging (senesence)
    - - stim cell division and elongation in stems
      - xylem differentaition
      - apical dominance and leaf senescence
      - chem similar to cholesterol and animal sex hormones but receptor embedded in plasma membrane
      - effects like auxin's
    - - stimulate fruit growth
      - stimulate seed germination
      - ctrl stem elongation
      - water
        
        seeds
        
        makes gibberellin
        
        amylase secreted by aleurone
      - in endosperm (3n tissue)
      - **induced fruit growth
  - - - gas involved in fruit ripening
      - response to mechanical stress
      - ratio of auxin to ethylene decre senescence
      - triple response
        
        slowing elongation
        
        thickening of stem
        
        horizontal growth
    - - seed dormancy
      - drought tolerance- stomata closure
      - needs to be washed off (enough water) for seed to germinate
    - - flowering hormone
      - produced in leaves in appropriate day length- phytochrome is the photoreceptor
      - apex- vegetative growth to flowering