Changes in the power spectrum of electrical signals in maize leaf induced by osmotic stressReport as inadecuate




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Chinese Science Bulletin

, Volume 57, Issue 4, pp 413–420

First Online: 22 January 2012Received: 11 April 2011Accepted: 21 September 2011

Abstract

To quantify the characteristics of the power spectrum of plant electrical signals, we defined the following concepts: spectral edge frequency SEF, spectral center frequency SCF, power index PI and power spectral entropy PSE. These parameters were used to examine and quantify changes in the power spectrum of electrical signals in maize leaves under osmotic stress. In the absence of osmotic stress, the SEF of the electrical signal in maize leaves was approx. 0.2 Hz and the SCF was approx. 0.1 Hz. The electrical signal in maize leaves was mainly a slow wave signal with a frequency of 0–0.1 Hz. After 2 h osmotic stress, the SEF and SCF of the electrical signal increased to higher frequencies. The proportion of the fast wave frequency also increased to 0.1–0.2 Hz, resulting in a dramatic increase in PSE. We also found that the changes in PSE and SCF were significantly correlated during osmotic stress. We propose that the changes in the PSE and SCF in maize leaves can be used as a sensitive signal indicating water deficit in leaf cells under osmotic stress. Thus, measurement of SCF or PSE of electrical signals in maize leaves could be used to develop early warning and rapid diagnosis techniques for the water demands of plants.

Keywordsplant electrical signal power spectrum osmotic stress maize This article is published with open access at Springerlink.com

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Author: XiaoHui Zhang - NingMei Yu - Gang Xi - XiaoLi Meng

Source: https://link.springer.com/article/10.1007/s11434-011-4820-5







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