植物细胞外电势差信号对根系吸水过程的响应特征*

南京大学学报(自然科学版) ›› 2011, Vol. 47 ›› Issue (5): 627–634.

植物细胞外电势差信号对根系吸水过程的响应特征*

杨磊**，周启友，吴世艳

出版日期:2015-04-30 发布日期:2015-04-30
作者简介: (南京大学地球科学与工程学院水科学系，南京，210093)
基金资助:
国家自然科学基金(40771038)

Experimental study on the response of extracellular electric potential difference of plant during the water absorption of root

Yank Lei，Zhou Qi-You ,Wu Shi-Yan

Online:2015-04-30 Published:2015-04-30
About author: (Dcpartmcnt of Hydrosciences, Nanjing University, Nanjing，210093，China)

摘要/Abstract

摘要： 植物细胞外电势差信号能够反映植物生理信息，通过插入黄杨树干和上壤金属电极，然后测定这种细胞外电势差，并借助小波变换方法，探究其对根系吸水过程的响应.结果表明:加水后必然产生
动作电位信号，在上壤含水量相似的条件卜，加水量越大，动作电位信号越强，而在加水量相当的条件下，土壤含水量越低，动作电位信号越强;树干一上壤之间的电势差在加水后波动幅度增加，并呈衰减趋
势，当波动幅度衰减到几毫伏量级时，树干一上壤之间的电势差出现口变化规律，即在正午左右电势差出现极值.

Abstract: Previous studies have shown that extraccllular electric potential difference signals could reveal the physiological information of plant. When the plant is stimulated by the change of environment，such as water
absorption and temperature variation, electrical signals that could be obtained by the instruments will generate and transport by cells, In this study, metal electrodes arc inserted into a boxtrec trunk and the soil around the tree to
capture the action potential(AP).Water irrigation is chosen as a stimulation method and irrigation events arc repeated in different soil conditions. Since the measured electrical signal is slightly disturbed by noise and the plant
electrical signal has a property of low frequency, wavclet transform method is applied to seek the information of AP transmission. During the AP signal is transporting, electric potential difference is measured in high frequency at the
same time to catch the AP, with the aim to explore the electrical response of water absorption of root.The results indicate that:irrigation events with different volume of water give rise to action potential under various conditions of
soil condition. When the volume of irrigation water is similar, the larger volume creates the stronger action signal. Meanwhile, while the water amount is close, the lower soil moisture content brings the stronger action signal.This
suggests that the stronger stimulation of the environment results the more powerful signal. Moreover, the fluctuation range of electric potential difference measured between trunk and soil increases immediately after
irrigation, and then it has an attenuation trend in the following few days. As the fluctuation range drops to few millivolts, the diurnal variation phenomenon of the electric potential difference between trunk and soil comes up.
The appearance of diurnal variation shows that the effect of water irrigation totally finishes.

杨磊**，周启友，吴世艳. 植物细胞外电势差信号对根系吸水过程的响应特征*
[J]. 南京大学学报(自然科学版), 2011, 47(5): 627–634.

Yank Lei，Zhou Qi-You ,Wu Shi-Yan. Experimental study on the response of extracellular electric potential difference of plant during the water absorption of root
[J]. Journal of Nanjing University(Natural Sciences), 2011, 47(5): 627–634.

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