Abstract
We studied experimentally the effect of low-energy light irradiation, especially the effect of linearly polarized light, on hyphal growth of shiitake-mushroom. In the case of low-power Ar-laser light irradiation, an increase of growth rate was observed compared to that of non-irradiated samples. Irradiating linearly polarized light from a conventional fluorescent lamp, it was observed clearly that the hyphal growth in the direction parallel to the polarization of light is greater than that in the vertical direction. It was also found experimentally that the difference of growth rate between parallel and vertical polarizations of light is remarkable at the illuminance of 50 lx and slightly appreciable at 100 lx, although almost no difference was observed at 1000 lx.
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