Department of Chemistry and Biochemistry, Oakwood University, Huntsville, AL 35896, USA.
Bioelectrochemistry. 2019 Feb;125:25-32. doi: 10.1016/j.bioelechem.2018.09.001. Epub 2018 Sep 5.
The Venus flytrap captures insects with one of the most rapid movements in the plant kingdom. There is a significant difference between properties of electrical signals generated in the Venus flytrap described in literature. Amplitudes of action potentials vary from 14 mV to 200 mV with duration of signals from 2 ms to 10 s. Here we present experimental study of potential differences between Ag/AgCl electrodes inserted to the trap, petiole, and into soil or external ECG electrodes attached to surfaces of the Venus flytrap. Diverse types of electrodes with various positions in a plant tissue or in soil show different amplitude and duration of electrical signals because potentials are measured in different electrochemical circuits. Electrical signals in the Venus flytrap were induced by mechanical stimulation of the trigger hairs or by chemical stimulation of a midrib using small drops of HO or HNO. Here we found that action potentials can propagate with speed up to 10 m/s in the trap of D. muscipula. Results are compared with equivalent electrical circuits.
捕蝇草以植物界最快的运动之一捕捉昆虫。文献中描述的捕蝇草产生的电信号特性有很大的不同。动作电位的幅度从 14 mV 到 200 mV 不等，信号持续时间从 2 ms 到 10 s。在这里，我们介绍了对插入捕蝇草陷阱、叶柄和土壤中的 Ag/AgCl 电极以及附着在 Venus 捕蝇草表面的外部 ECG 电极之间的电位差的实验研究。由于在不同的电化学电路中测量电位，因此在植物组织或土壤中具有不同位置的各种类型的电极显示出不同的电信号幅度和持续时间。机械刺激触发毛或用 HO 或 HNO 的小液滴刺激中脉可在 Venus 捕蝇草中诱导电信号。在这里，我们发现动作电位可以以高达 10 m/s 的速度在 D. muscipula 的陷阱中传播。结果与等效电路进行了比较。
