Bioelectric potential characteristic of pothos under light emitting diode

Plant bioelectric potential changes according to environmental factors, for example temperature, humidity, light intensity and atmospheric pressure. Light is very important factor for plant to photosynthesize. In this paper, the relationship between bioelectric potential and wave length of emitting light (LED: blue, green, red and white) was examined. The characteristic in darkness was adopted as a control and it was compared with the characteristics in each wave length. The characteristic was measured as a function of time. The data was input every 0.1 seconds and summed for one hour. The summation value was adopted as a representative value. The correlation-ship between the characteristic under light emitting and the control was derived. The coefficient had a maximum as the characteristic under emitting was shifted one to three hours as of control characteristic. The coefficient became lower as the frequency of emitting light became higher. The coefficient of 0.84 under red light (660 nm) at the shifted time of 3 hours was obtained, and 0.7 for green light (525 nm) at the shifted time of one hour, 0.5 for blue (475 nm) without shift. The coefficient of over 0.5 was obtained under white light at the shifted time of one to two hours. It is thought that the result makes contribution to elucidate the plant physiology. In addition, it makes contribution to plant environmental sensor and plant factory.