growth substance
growth substance (phytohormone; plant hormone) Any of a number of organic chemicals that are synthesized by plants and regulate growth and development. They are usually made in a particular region, such as the shoot tip, and transported to other regions, where they take effect. See abscisic acid; auxin; cytokinin; ethylene; gibberellin.
growth substance
growth substance A naturally occurring compound, other than a nutrient, which promotes, inhibits, or otherwise modifies the growth of a plant.
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