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Microorganisms 2014, 2(1), 58-72; doi:10.3390/microorganisms2010058

Effect of Electrical Stimulation on Fruit Body Formation in Cultivating Mushrooms

1,* , 1,†
1 Department of Electrical Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551, Japan 2 Morioka Forest Union, 2-9 Konya, Morioka, Iwate 020-0885, Japan 3 Iwate Biotechnology Research Center, 22-174-4 Narita, Kitakami, Iwate 024-0003, Japan These authors contributed equally to this work.
* Author to whom correspondence should be addressed.
Received: 9 December 2013 / Revised: 25 December 2013 / Accepted: 23 January 2014 / Published: 12 February 2014
(This article belongs to the Special Issue Advances and New Perspectives in Microbial Research)
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The effect of high-voltage electrical stimulation on fruit body formation in cultivating mushrooms was evaluated using a compact pulsed power generator designed and based on an inductive energy storage system. An output voltage from 50 to 130 kV with a 100 ns pulse width was used as the electrical stimulation to determine the optimum amplitude. The pulsed high voltage was applied to a sawdust-based substrate of Lyophyllum decastes and natural logs hosting Lentinula edodes, Pholiota nameko, and Naematoloma sublateritium. The experimental results showed that the fruit body formation of mushrooms increased 1.3–2.0 times in terms of the total weight. The accumulated yield of Lentinula edodes for four cultivation seasons was improved from 160 to 320 g by applying voltages of 50 or 100 kV. However, the yield was decreased from 320 to 240 g upon increasing the applied voltage from 100 to 130 kV. The yield of the other types of mushrooms showed tendencies similar to those of Lentinula edodes when voltage was applied. An optimal voltage was confirmed for efficient fruit body induction. The hypha activity was evaluated by the amount of hydrophobin release, which was mainly observed before the fruit body formation. The hydrophobin release decreased for three hours after stimulation. However, the hydrophobin release from the vegetative hyphae increased 2.3 times one day after the stimulation.
Keywords: pulsed power; electrical stimulation; Lentinula edodes; mushroom pulsed power; electrical stimulation; Lentinula edodes; mushroom
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Takaki, K.; Yoshida, K.; Saito, T.; Kusaka, T.; Yamaguchi, R.; Takahashi, K.; Sakamoto, Y. Effect of Electrical Stimulation on Fruit Body Formation in Cultivating Mushrooms. Microorganisms 2014, 2, 58-72.

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