Behavior of Bioelectric Potential on the Leaf Surface under the Sound Stimulus.

概要

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In order to investigate the biological response in the plant to the environment, changes in Bioelectric potentials on the leaf surface of <I>Schefflera abroricora</I> under the various sort of sound stimulus were measured by an experimental system. As a result, there are some leaves in which spike potential is induced or spontaneous spike is dispersed under a certain sound stimuli at the sound pressure level of more than 70 dB. However, these modes of response are diversified and it appears to have no definlite correlation with stimuli. Especially, by the continuous stimulus with a sine wave in the range from 20 Hz to 20 kHz, no obvious differences in changes with frequency were not confirmed, but it was found that pulsated sound stimulus in constant intervals from 1 to 20 sec, the period of induced spike was entrained and further matched with the interval of the stimulus. Accordingly, it is suggested that the plant has an ability to sense the sound, and is more sensitive to the rhythm rather than the tone of the sound. Furthermore, it was found that the phenomenon which the induced spike potential on the leaf surface synchronized with each other, as time passes by, under the stimulus with pulsated sound triggered by the surface potential of one leaf, resulting in a formation of a sort of bio-feedback loop.
日本生物環境工学会の論文