Keio University, Department of Mechanical Engineering, 3-14-1 Hiyoshi, Kouhoku-ku, Yokohama, Kanagawa, 223-8522, Japan.
Ishikawa Agriculture and Forestry Research Center, No 1-1 Mizuho, Noto-chou, Housu-gun, Ishikawa, 927-0311, Japan.
Fungal Biol. 2023 Oct-Nov;127(10-11):1362-1375. doi: 10.1016/j.funbio.2023.09.003. Epub 2023 Sep 26.
Large shiitake mushrooms (Lentinula edodes, pileus > 8 cm in diameter) are difficult to cultivate and account for only 3-5% of the total harvest. This study focused on the water absorption process within a log during the growth of fruiting bodies in order to increase the yield of large shiitake mushrooms. Konara oak logs (Quercus serrata, 85-95 mm in diameter, 290 mm in length) were inoculated with shiitake mycelium plugs and nine months later, young fruiting bodies developed, at which point the log was analyzed using magnetic resonance imaging (MRI) over a period of two weeks. The signal intensity and T and T relaxation time constants were determined from the acquired images, along with the distribution of water concentration within the entire log. The axial distributions of water concentrations in the log were higher in the 80 mm region around the fruiting body. The rate of decrease in water concentration indicated that water was supplied to the fruiting body from 80 mm axially in the upper half of the sapwood in the log. On the other hand, the water concentration in the heartwood did not decrease and the heartwood did not contribute to the water supply to the fruiting bodies.
大型香菇（Lentinula edodes，菌盖直径>8 厘米）难以栽培，仅占总产量的 3-5%。本研究关注的是菌盖生长过程中原木内的吸水过程，以提高大型香菇的产量。使用 Konara 栎木原木（Quercus serrata，直径 85-95 毫米，长 290 毫米）接种香菇菌丝塞，9 个月后，幼菇发育，此时使用磁共振成像（MRI）对原木进行为期两周的分析。从采集的图像中确定信号强度和 T 和 T 弛豫时间常数，以及整个原木内水浓度的分布。原木内水浓度的轴向分布在菌盖周围 80 毫米区域较高。水浓度的下降速率表明，水是从原木边材上部的 80 毫米轴向供应给菌盖的。另一方面，心材内的水浓度没有下降，心材也没有为菌盖供水。
