Auxins

Important phytohormones (indole-3-acetic acid = often abbreviated as IES) for regulating plant growth, produced in the active growth zones of the plant such as shoot and root tips. In interaction with abscisic acid and cytokinins, various processes are controlled. 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 breaking of tree buds, as well as the rapid growth of young shoots and control leaf fall. Furthermore, the cell division rate in the cambium is increased and thus secondary thickness growth is stimulated. Auxins can delay fruit ripening.

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Auxins

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Auxins

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