一、性质和种类植物体内有一种化学信使,它们往往在一定的部位合成后,要运输到其他部位才能发挥作用。它们是植物生长发育过程中不可缺少的物质,人们称之为植物激素。植物激素不同于肥料,也不同于一些代谢产物,如酶系统、有机酸和维生素等。由于植物激素在植物体内含量甚微,所以提取天然激素是较困难的,生产中使用也不合算。目前除了赤霉素可以通过赤霉菌的大量培养提取外,在生产实践中大量应用的是植物生长调节剂。植物生长调节剂是人工合成的、具有生理活性的化合物。这些化合物分子量不大,但具 First, the nature and species There is a chemical chemical plant messenger, they are often in a certain part of the synthesis, to transport to other parts to play a role. They are indispensable in the process of plant growth and development, people call them plant hormones. Plant hormones are different from fertilizers, but also different from some metabolites, such as enzyme systems, organic acids and vitamins. As plant hormones in the plant content is very small, so the extraction of natural hormones is more difficult to use in production is not cost-effective. At present, in addition to gibberellin can be extracted through a large number of cultivation of Gibberella, a large number of applications in the production practice is a plant growth regulator. Plant growth regulators are synthetic, physiologically active compounds. These compounds are not large molecular weights, but with