植物信号系统──它在功能整合与适应环境中的作用

Plant signaling system

高等植物是由多层次结构（细胞、组织、器官）组成，在多变环境下生活的开放系统。各部位的处境不同，分工各异。因而它们之间必需通过信号传递进行信息交换才能协调整株的行为、适应外界的变化。植物信号具有多种形式，如化学信号、电波信号与水力信号等。本文主要以乙酰胆碱在信号传递中的功能为例证阐述植物的信号系统。

Higher plant is an open system living under constantly varying environment. It is composed of structures of different hierarchical levels (cell, tissue, organ). The various parts assume different functions under diverse conditions. Consequently, there must exist exchange of information among the various structures in forms of chemical, electrical, mechanical signal transmission to integrate its behavior in adaptation to external changes. The role of acetylcholine in signal transmission is mainly adapted for our present case study.