Illumination/Darkness-Induced Changes in Leaf Surface Potential Linked With Kinetics of Ion Fluxes

Jinhai Li; Yang Yue; Ziyang Wang; Qiao Zhou; Lifeng Fan; Zhiqiang Chai; Chao Song; Hongtu Dong; Shixian Yan; Xinyu Gao; Qiang Xu; Jiepeng Yao; Zhongyi Wang; Xiaodong Wang; Peichen Hou; Lan Huang

doi:10.3389/fpls.2019.01407

Illumination/Darkness-Induced Changes in Leaf Surface Potential Linked With Kinetics of Ion Fluxes

Front Plant Sci. 2019 Nov 7:10:1407. doi: 10.3389/fpls.2019.01407. eCollection 2019.

Authors

Jinhai Li^{1

2}, Yang Yue^{1

3}, Ziyang Wang^{1

3}, Qiao Zhou^{1

3}, Lifeng Fan^{1

2}, Zhiqiang Chai^{1

2}, Chao Song^{1

3}, Hongtu Dong⁴, Shixian Yan^{1

3}, Xinyu Gao^{1

2}, Qiang Xu^{1

2}, Jiepeng Yao^{1

3}, Zhongyi Wang^{1

2

3}, Xiaodong Wang⁴, Peichen Hou⁴, Lan Huang^{1

3}

Affiliations

¹ College of Information and Electrical Engineering, China Agricultural University, Beijing, China.
² Key Laboratory of Modern Precision Agriculture System Integration Research, Ministry of Education, Beijing, China.
³ Key Laboratory of Agricultural Information Acquisition Technology (Beijing), Ministry of Agriculture, Beijing, China.
⁴ Beijing Research Center of Intelligent Equipment for Agriculture, Beijing Academy of Agricultural and Forestry Sciences, Beijing, China.

Abstract

A highly reproducible plant electrical signal-light-induced bioelectrogenesis (LIB) was obtained by means of periodic illumination/darkness stimulation of broad bean (Vicia faba L.) leaves. By stimulating the same position of the same leaf with different concentrations of NaCl, we observed that the amplitude and waveform of the LIB was correlated with the intensity of stimulation. This method allowed us to link dynamic ion fluxes induced by periodic illumination/darkness to salt stress. The self-referencing ion electrode technique was used to explore the ionic mechanisms of the LIB. Fluxes of H⁺, Ca²⁺, K⁺, and Cl^- showed periodic changes under periodic illumination/darkness before and after 50 mM NaCl stimulation. Gray relational analysis was used to analyze correlations between each of these ions and LIB. The results showed that different ions are involved in surface potential changes at different stages under periodic illumination/darkness. The gray relational grade reflected the contribution of each ion to the change in surface potential at a certain time period. The ion fluxes data obtained under periodic illumination/darkness stimulation will contribute to the future development of a dynamic model for interpretation of electrophysiological events in plant cells.

Keywords: electrical signal; gray relational analysis; ionic mechanisms; light-induced bioelectrogenesis; periodic illumination/darkness; salt stimulation.