Diagram showing different growth responses of the three main plant organs to auxins
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Auxin was applied from the outside to stems, roots and (axillary) buds. The curves illustrate the responses (stimulation (promotion) or inhibition of growth-rates) in relation to the applied concentrations of IAA. The curves do not necessarily represent the relationships between internal auxin concentrations and growth-rates. (According to: L. J. AUDUS, 1959)
