植物调节剂是有机化合物,以极微量施于作物时,对作物的生长和发育有促进、阻碍或改变其生理进程的作用。现在应用的植物调节剂除了摘尖剂和落叶剂之外,都是通过影响植物中的天然激素系统而起作用的。本文按照它们的来源、作用方式及其在作物生产中的应用作一介绍。一、天然植物激素天然植物激素目前主要应用于作物的组织和分生组织培养。一些经济价值高的作物,例如椰子和油棕榈,因为它们只有一个茎和一个顶芽,不能用扦插枝条的方式繁殖,也不能用 Plant modifiers are organic compounds that, when applied in very small quantities to a crop, promote, retard or alter the physiological processes of the crop’s growth and development. The plant modifiers that are now in use, apart from the picking agents and the defoliant agents, all work by influencing the natural hormone system in plants. This article gives an introduction based on their origin, mode of action and their use in crop production. First, natural plant hormones Natural plant hormones are mainly used in crop tissue and meristematic culture. Some of the most economically valuable crops, such as coconut and oil palm, have only one stem and one top bud, can not multiply by cutting branches, and can not be used