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Topic 7 : Plant Growth & Development and Plant Hormone, 5 stages,…

- - - - regulates
        
        phototropism
        
        gravitropism
        
        thigmotropism
      - promotes stem growth
      - stimulate root growth
      - delays leaf senescence
      - promotes flowering and fruiting
    - - indolebutyric acid (IBA)
      - naphthaleneacetic acid (NAA)
      - 2,4- dichlorophenoxyacetic acid (2,4-D)
      - indoleacetic acid (IAA)
    - - shoot tips
      - terminal buds
      - young leaves
      - flower
  - - - breaks seed domancy
      - stimulate stem elongation
      - induce parthenocarpic (seedless) in fruit
    - - gibberellic acid (GA3)
    - - shoot tips
      - root tips
      - embryos
  - - - promotes fruit ripening and flowering
      - promotes femaleness in plant
      - promotes senescence and leaf abscisssion
    - - ethephon or ethrel
      - ethylene
    - - aging frlowers
      - germinating seeds
      - ripening fruits
      - wounded tissue
  - - - cell division
      - stimulate lateral bud growth
      - delay aging and death ( senescence )
    - - benzyladenine ( BA)
      - zeatin
      - kinetin
      - pyranylbenzyladenine (PBA)
    - - embryos
      - in meristemic cell
  - - - inhibits shoots growth
      - promotes dormancy in
        
        seeds
        
        buds
      - stimulates the closure of stomata
      - promotes drawf plant
    - - damiozide (B-9) synthetic
      - benzoid acid (natural)
    - - stems
      - green fruits
      - leaves
- - - - less than 12 hrs
      - ex:soybean, poinsettia
    - - exceed 12 hrs
      - ex: dahlia, begona carnation, fuchia
- - - - helped by ethylene hormone