Mushrooms have recently been attracting increasing attention for their use as part of a healthy diet; because they are rich in nutrients while low in calories, they are effective in preventing modern life-style diseases. Accordingly, mushroom farming has increased. In order to increase the productivity of mushroom farming, it is important to study the optimal farming conditions, such as the temperature, humidity, light stimulus, and the composition of the atmosphere, as well as the ingredients of the culture medium. However, these conditions have generally been chosen according to farmers' experiences at the site and few scientific studies have so far been conducted. We have scientifically investigated the optimum growing conditions of mushrooms focusing on the relationship between the bioelectric potential and the morphogenetic properties. In this study using Grifora Frondosa as a sample, we investigated how the mushroom responds to different wavelengths, luminance, and the irradiation method of the light-stimulus using the bio-electric potential signal as an indicator. The bio-electric potential is estimated to have a close relationship with the activation of the cells. Based on the obtained bio-electric potential data, we experimentally developed a novel light source instrument using a LED for controlling growth, which is effective in forming the fruit-body of the mushroom after development of the primordium at the mushroom growing farm. We report here on the fundamental data concerning the influence of bio-electric potential produced as a result of various light stimuli on the morphogenetic properties of Grifora Frondosa.
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HIRAMA et al. (2002) studied this question.