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Important phytohormones (indole-3-acetic acid = often abbreviated as IES) for regulating plant growth, which are produced in the active growth zones of the plant such as shoot and root tips. Various processes are controlled in interaction with abscisic acid and cytokinins. In low concentrations, auxins promote the elongation growth of the cotyledons, the shoot axes and the root. In high concentrations, root and shoot growth are inhibited. They promote the rapid growth of young shoots and control leaf fall. The cell division rate in the cambium is increased and secondary thickness growth is stimulated.

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