A plant hormone or phytohormone is a chemical substance produced
naturally in plants which is translocated to another region for regulating one
or more physiological reactions when present in low concentration. All
phytohormones are growth regulators but all growth regulators are not
phytohormones. Phytohormones can be broadly divided into two groups based on
their functions in a living plant body- growth promoters and growth inhibitors.
Auxin, gibberellins and cytokinin are growth promoters and ethylene and
abscisic acid (ABA) are growth inhibitors. Read more>>
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