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Abscisic acid or ABA is a plant growth regulator. Since the activity of abscisic acid is an inhibitory effect on the plant, it is called as plant growth inhibitors. It is also known as the stress hormone.

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Abscisic acid is an important plant growth regulator for the induction of embyrogenesis. It is a growth inhibitor and can counter-act other hormones like auxin, gibberellins, cytokinins.
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