The Changes of Electrical Signals in Corn at Different Temperatures

Electrical signals in plants play the role of biological messages. It is significant to make them understood. In order to acquire the basic characteristics of the electrical signal in corn, wavelet soft-threshold de-noising method was introduced to reduce the noise for the acquisition signals. The amplitudes of electrical signals in corn were μV level, and the frequencies were below 1 Hz, large parts of which were lower than 0.5 Hz. The amplitudes were large, and the distribution of power spectrum was stable when the environment temperature between 20 °C and 35 °C. The ratio of signal below 0.1 Hz gained when the temperature was above 35 °C, while the amplitude reduced obviously. It can be considered that the disappearance of the high frequency and the reducing of the amplitudes were the signs of cell vital activity subsiding. Thus, it is possible to achieve the prediction life status according to the amplitudes and the frequencies of electrical signals in plants.