细胞骨架参与乙酰胆碱诱导的气孔开放

动物系统中，乙酰胆碱（Ａｃｈ）是胆碱能系统中的主要成分，近上的研究表明高等植物体内均有Ａｃｈ、胆碱乙酰基转移酶和乙酰胆碱酯酶，以及乙酰胆碱受本的存在，这些物质调节着生命吕的许多重要过程，如气孔运动等。以前的研究表明微管、微丝参与了气孔的运动。本研究了Ａｃｈ调控的气孔开放是否与微管、微丝的结构相关联。结果表明Ａｃｈ可以在ＫＣｌ溶液和无ＫＣｌ溶液中诱导气孔开放；同时Ａｃｈ还能在无ＫＣｌ溶液中促进保卫

Stomatal Opening Induced by Acetylcholine Is Associated with Cytoskeletal Components

Acetylcholine (Ach) is a key component of animal cholinergic system. Recent experiments demonstrated that Ach, choline acetyltransferase, acetylcholinesterase and Ach receptors are present in all parts of plants and have many functions, including inducing stomatal movement. The authors' previous work has evidenced that microtubules and microfilaments are involved in regulating both stomatal closing and opening. The present investigation is to determine whether stomatal opening induced by Ach is associated with microtubules and microfilaments. The results showed that Ach could induce stomatal opening of Vicia faba L. with or without addition of KCl in the dark. Ach also stimulated protoplast swelling in a K _free solution in the dark. However, the induction was partially suppressed when the strips and protoplasts were pretreated with either cytochalasin B, an inhibitor of F_actin polymerization, or oryzalin, an inhibitor of plant microtubule polymerization. Thus, our data suggest for the first time that stomatal opening induced by Ach is associated with the dynamics of microtubules and microfilaments.