Study on the structure elucidation and their activity of impulse generating substances from Albizzia julibrissin

尽管人们对含羞草的叶片运动和刺激的快速传导机制一直存在争议，但我们发现含羞草对外源物质的处理非常敏感，并且这种刺激提供了电生理反应。实际上，在静息电位的观察过程中，豆科植物的甲醇提取物记录到了强烈的脉冲。然后，我们寻找合欢中具有这种活性的物质。在这项研究中，从2003年的菊花(A.julibrissin)粗甲醇提取物(2公斤)的正己烷可溶部分中分离出几毫克的相对不稳定的化合物作为活性成分。2004年，从该植物的其他提取物(5~6公斤)中也获得了40毫克以上的活性化合物。通过对活性物质的波谱分析，我们得到了它们的部分结构，但整个结构仍有待确定。将该活性化合物应用于其他植物，如黄瓜，可观察到电生理反应。我们研究了该化合物对拟南芥气孔开度的影响，发现该化合物也抑制生菜种子的萌发。

Although much attention has been paid on the leaf movement of Mimosa pudica with irritation and the mechanism for the rapid conduction of stimulus is still controversial in the plant, we found that M.pudica was very sensitve to the administration of extraneous substances and such stimulation afforded electrophysiological responses. Actually, during observation of resting potential strong pulses were recorded by an administration of methanol extract of leguminous plants. We then searched for the substance responsible for the activity in Albizzia julibrissin. In this study, a few miligram of the relatively unsable compound was isolated as an active principle from the hexane soluble fraction of crude methanolic extract of A.julibrissin (2 kg) in 2003. From the other extract of this plant (5〜6 kg), more forty miligram of the active compound was also obtained in 2004. Spectral analysis of the active compound led us to have their partial structures, but the whole structure still remained to be determined. Electrophysiological responses were observed when the active compound was administered to the other plant species, such as Cucumis sativus. We investigated the effect of this compound on the stomatal aperture of Arabidopsis thaliana and we found that this compound also inhibited the germination of lettuce seed.