半个世纪来,植物生理学家们发现有五大类植物内源激素(生长素、赤霉素、细胞分裂素、脱落酸和乙烯)在植物生长发育中起重要作用。与此同时,人们还合成了许多植物生长调节物质。它们可以调节植物的生长发育。如促进插枝生根,加速植株生长;促进种子、块根、块茎等萌芽或抑制它们发芽(贮藏的需要);矮化作物,改良作物的株型,防止倒伏,诱导开花,防止落花落果或疏花疏果;形成无籽果实,催熟,杀除杂草等。目前已用于商品生产的有:用2.4—D, For half a century, plant physiologists have found that five major classes of endogenous hormones (ghrelin, gibberellin, cytokinin, abscisic acid and ethylene) play an important role in plant growth and development. In the meantime, many people have synthesized many plant growth regulators. They regulate plant growth and development. Such as promoting the rooting of cuttings and accelerating the growth of plants; promoting the germination of seeds, tubers, tubers, etc., or inhibiting their germination (storage needs); dwarfing crops, improving the plant type of crops, preventing the lodging, inducing flowering, Thinning fruit; the formation of seedless fruits, ripening, killing weeds and so on. Currently used in the production of goods are: with 2.4-D,