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geotropism confusion!!

  • 03-11-2008 10:11pm
    #1
    lorr3
    Registered Users, Registered Users 2 Posts: 105 ✭✭


    hi there just a quick question?? can anyone explain how auxin can cause both positive and negative geotropism please???:confused:


Comments

  • #2
    2Scoops
    Registered Users, Registered Users 2 Posts: 1,845 ✭✭✭2Scoops


    This website seems to be saying that auxins are influenced by light. Hence, 'negative geotropism' is simply phototropism. Regular geotroprism occurs underground, i.e. without light interfering.

    http://www.biology-online.org/3/5_plant_hormones.htm


  • #3
    taram
    Registered Users, Registered Users 2 Posts: 1,226 ✭✭✭taram


    Positive geotropism: High doses of auxin stimulates ethylene production and excess ethylene inhibits elongation. Negative geotropism: The apical bud (top tip of the plant) produces auxin, and it causes the plant to grow upwards rather than out (apical dominance effect).


  • #4
    lorr3
    Registered Users, Registered Users 2 Posts: 105 ✭✭lorr3


    thanks:):)


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