Delignification and digestibility of wood accompanied with decay by shiitake, Lentinula edodes
2008
Tokimoto, K.(Tottori Mycological Inst. (Japan)) | Koshitani, H.
Shiitake mycelia of 32 different strains were cultured on sawdust-rice bran media (80:20, w/w) at 22degC for 1-4 months. Although weight-loss of the media continued during the incubation time, decrease in lignin content of the media reached the maximum at three months of incubation. The rate of delignification of the media showed a significant difference among shiitake strains, but not among the species of wood, Quercus acutissima, Q. serrata and Fagus crenata. Digestibility of the media treated with the cellulase mixture 'Meicelase' was also improved with the incubation period of shiitake showing significant differences among the strains used. Digestibility and the amount of released sugars at the enzyme treatment showed negative significant correlations with the lignin content. Media decayed by five strains resulted in high digestibility of more than 42%, which represents the digestibility of rice straw with the same enzyme. The main sugars released from the decayed wood by the enzyme digestion were glucose and xylose.
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