PLANT RESPONSES and GROWTH

PLANT RESPONSES and GROWTH

1. TROPISM

   • Phototropism
   • Geotropism
   • Chemotropism
   • Thigmotropism
   • Positive=towards
   • Negative=Away

2. HORMONES

   • Auxin
   • Cytokinins
   • Gibberellins
   • Abscisic Acid
   • Ethene
   • Transport
     • Diffusion
     • Active Transport
     • Mass flow in Phloem sap/Xylem Tissue
   • COMMERCIAL USES
     • Gibberellins
       • Delay senescence in citrus fruit
       • + Cytokinins = elongation of fruits
       • Brewing
     • Cytokinins
       • Tissue culture - mass production
     • Ethene
       • 2-chloroethylphosphonic acid
       • Fruit ripening
       • Fruit drop
       • Female sex expression in cucumbers
     • Auxins
       • Rooting powder
       • Seedless Fruit
       • Herbicides

3. PLANT GROWTH

   • Meristems
     • Apical
     • Lateral bud
     • Lateral
     • Intercalary
     • Cell Division
     • Cell Elongation
   • Photopropism
     • Blue Light
       • Phototropin 1
       • Phototropin 2
   • Shedding Leaves
     • Cytokinins
     • Senescense
     • Abscission
     • Auxin
     • Ethene

4. APICAL DOMINANCE

   • Apical bud = Dominant over side shoots
     • Saves energy
     • Prevents side shoot competition
   • Auxin
     • Inhibit side shoot growth
     • High concentration = apical bud

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