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1934年,荷兰科学家柯格尔(Kogel)从玉米顶芽中分离出具有促进植物生长作用的活性物质,鉴定化学成分为吲哚-3-乙酸,缩写为IAA。这种物质在光线影响下,向背光的一面转移,背光的一方要比向阳的一方含量显著增高。由于IAA可促进细胞伸长,因此会造成植物向有光的方向弯曲。柯格尔称这种物质为植物生长素。到60年代人们又研究出与生长素化学结构相似的一类物质,通过生物方法鉴定也能起到生长调节的作用。于是,人工合成的吲哚丁酸
In 1934, Kogel, a Dutch scientist, isolated active substances that promote plant growth from corn buds. The chemical constituents were indole-3-acetic acid (abbreviated as IAA). Under the influence of light, this material is transferred to the side of the backlight, and the content of the backlight is significantly higher than that of the sunny side. Because IAA promotes cell elongation, it can cause plants to bend in the direction of light. Kogel called the substance auxin. By the 1960s, people studied a class of substances that resembled the chemical structure of auxin, which can also play a role in the regulation of growth through the identification of biological methods. Thus, synthetic indole butyric acid