一.問題的存在植物器官的脫落,是植物生活中的一種普遍存在的現象。秋天的落葉及花謝後的落花及果實成熟後的落果,都是人們所熟悉的事實。植物學者在很久以前,就注意過這個現象,從解剖學及生理學等方面來研究這個問題。但是,以人為的方法來防止或加速某種器官的脫落,因而符合於农業生產上的利益,還是最近一、二十年,植物生長素被應用到這個領域來以后的事情。在植物體中曾脫落的器官是很多的。除了我們熟悉的落花、落果、落葉以外,尚有枝條、頂芽、樹皮、小葉片、托葉、花蕾、花序、花蕚、花冠、雄蕊、花柱、種子等。這些器官,不論在發育的 I. The Problem The shedding of plant organs is a ubiquitous phenomenon in plant life. Fall leaves and flowers after the fall Xiemiao fruit ripe fruit fall, are people are familiar with the fact. Botanists long ago noticed this phenomenon and studied the issue in terms of anatomy and physiology. However, anthropogenic methods to prevent or accelerate the shedding of certain organs are in the interests of agricultural production and are the next two or so decades after the application of auxins to the field. There are many organs that have shed in the plant. In addition to the familiar flowers, deciduous, fallen leaves, there are branches, top buds, bark, small leaves, stipules, buds, inflorescences, scapes, corolla, stamens, styles, seeds and so on. These organs, whether in development or not