PLANT  GROWTH REGULATORS

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Like-cell division, cell enlargement, pattern formation, tropic growth, flowering, fruiting and seed formation

Growth promoting activities

 (indole compounds) IAA.

Auxin

Getting Started

Charles Darwin and his son Francis Darwin studied phototropism in canary grass. 

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F.W. Went isolated auxin from tips of coleoptiles of oat seedlings.

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First isolated from human urine.  Produced by growing apices of stems and roots.   IAA and IBA isolated from plants.  NAA, 2,4-D are synthetic.

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Physiological effects:   Initiate rooting in stem cultings.   Promote flowering in pineapples.  Help prevent fruit and leaf drop at early stages but promote abscission of older mature leaves and fruits. division.

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 Apical dominance  Induce parthenocarpy in tomatoes.  2, 4-D kill dicot weeds.  Used to prepare weed-free lawns.   Auxin controls xylem differentiation and helps in cell-division.

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