Effect of Electrical Stimulation on Fruit Body Formation in Cultivating Mushrooms.
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 ofLyophyllum decastesand natural logs hostingLentinula edodes,Pholiota nameko, andNaematoloma 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 ofLentinula edodesfor 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 ofLentinula edodeswhen 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.
Department of Electrical Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551, Japan. takaki@iwate-u.ac.jp.
Koichi
K
Takaki
Department of Electrical Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551, Japan. t2313022@iwate-u.ac.jp.
Kohei
K
Yoshida
Department of Electrical Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551, Japan. t2311027@iwate-u.ac.jp.
Tatsuya
T
Saito
Department of Electrical Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551, Japan. tomohiro.kusaka@toppan.co.jp.
Tomohiro
T
Kusaka
Department of Electrical Engineering, Iwate University, 4-3-5 Ueda, Morioka, Iwate 020-8551, Japan. r-yamaguchi@jreast.co.jp.
Ryo
R
Yamaguchi
Morioka Forest Union, 2-9 Konya, Morioka, Iwate 020-0885, Japan. sotoyama@smile.ocn.ne.jp.
Kyusuke
K
Takahashi
Iwate Biotechnology Research Center, 22-174-4 Narita, Kitakami, Iwate 024-0003, Japan. sakamoto@ibrc.or.jp.
Yuichi
Y
Sakamoto
Lentinula edodes; electrical stimulation; mushroom; pulsed power
FEMS Microbiol Lett. 2000 Apr 15;185(2):139-45
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