29 植物の運動に関する化学及び生物学(口頭発表の部)

概要

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Many plants close their leaves in evening as if to sleep and open them early in the morning. Such a circadian rhythm has been known to be controlled by their internal clock. As already reported, recently, we succeeded in isolating a true active stimulant (activity: ca. 10^<->8〜10^<-9>M) from the same plant, which consists of three different components (potassium L-malate; magnesium trans-acconitate; dimethyl ammonium salt). All of these components are required for causing the rapid leaf-movement of Mimosa pudica. In addition, the leaf-closing and -opening substances were also isolated from Mimosa pudica. They concern with nyctinastic movement controlled by an internal clock. Therefore, the rapid movement is different from the slow nyctinastic one in mechanism. Further extensive study on other nyctinastic plants led to the isolation of a variety of leaf-closing and -opening substances. As represented by Lespedeza cuneata G. Don. and Phyllanthus urinaria L., their leaf movement was proved to be controlled by the balance of concentration between these two leaf-opening and -closing substances, which was controlled by the activation of β-glucosidase.
天然有機化合物討論会の論文
1999-09-01