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初中《植物学》“茎生长的向光性”一节里提到:“幼苗弯向光源生长的原因是由于生长素的作用”。在初中《生理卫生》“垂体”一节里提到:“生长素能调节人体的生长发育”。这二者实际上并非同一种物质,后者应称“生长激素”生长素是一种植物激素,化学名称为吲哚乙酸(简称IAA)。它没有专门的分泌器官,是由植物生长旺盛的部位——茎尖、根尖、幼叶以及其他分生组织等产生的。因为它对植物的生长有促进作用,故取名为生长素。生长素具有二重性,即在低浓度时促进植物的生长,高浓度时抑制植物的生长。自从发现吲哚乙酸以后,已
Junior High School “Botany” “Stem growth to the light of” section mentioned: “The seedling bent light source growth is due to the role of auxin.” In the junior high school “Physiological Health” “Pituitary” section mentioned: “Auxin can regulate the body’s growth and development.” These two are actually not the same substance, the latter should be called “growth hormone” auxin is a plant hormone, the chemical name for indole acetic acid (referred to as IAA). It does not have a special secretion organ, which is produced by the plants that grow vigorously - the shoot tips, root tips, young leaves, and other meristematic tissues. Because of its role in promoting the growth of plants, it is named auxin. Auxin has the duality, that is, at low concentrations to promote plant growth, high concentrations inhibit plant growth. Since the discovery of indole acetic acid, have