Growth inhibitor a substance that slows the growth of a plant, for example the plant hormones ABSCISIC ACID and ETHYLENE (ethane), which act at very low concentrations.
Plant hormone is a kind of physiological activity substance adjusting plantgrowth effectively.
植物激素是对植物的生长发育产生显著的调节作用的生理活性物质。
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Nitric oxide (NO) is a physiologically reactive substance, as a plant cell signaling molecule, it play an important role in plant root growth and other physiological processes.