2004 Volume 16 Issue 4 Pages 193-197
In our previous study of measurements of bio-electric potential of Grifola frondosa, a rhythmic fluctuation was often observed in the bio-electric potential reaction, even when light stimuli were applied at regular intervals. If there is any relationship between the duration of light/dark and the rhythmic fluctuation of bio-electric potential, it could be worthwhile to investigate any corresponding relationship to the growth control of mushroom. In this study, the characteristics of rhythmic fluctuations, both for the fruit body and the primordium of Grifola frondosa were investigated, focusing on the reaction of the bio-electric potential when light stimuli were applied to the mushroom on a regular cycle of light/dark conditions for many hours. As a result, rhythmic fluctuation characteristics in the bio-electric potential of the fruit body were confirmed. An approximate cycle was noted between 13 to 64 hours, which tends towards a 1/f2 characteristic fluctuation. On the other hand, although the dependence of bio-electric potential changes on the light stimuli was not observed in the primordium, a bio-rhythm was noted, with an approximate periodic characteristic between 14 to 68 hours, tending towards a 1/f2 fluctuation as in the fruit body.
