PROBLEM TO BE SOLVED: To provide a method for producing culture medium base material used for artificial culture medium for mushroom comprising decomposing and removing mushroom mycelia growth-inhibiting substance which lumbers or pruned branches of broadleaf tree or conifer tree, plants and/or the like contain.SOLUTION: The method for producing culture medium base material used for artificial culture medium for mushroom includes: filling a sealed container with wood material such as sawdust or chips produced by pulverizing lumbers or pruned branches of broadleaf tree or conifer tree, plants and/or the like maintaining the inside of the container to have prescribed temperature and prescribed pressure along a saturated steam pressure curve jetting cooled water shower to the inside of the sealed container to give shock waves of steam to the wood material to promote hydrolytic reaction of plant tissues and flowing out the mushroom mycelia growth-inhibiting substance which the wood material contains to the outside of the wood material, as gas or liquid to obtain the wood material substantially containing only lignin and cellulose and having no ingredients inhibiting the growth of the mycelia.COPYRIGHT: (C)2012,JPO&INPIT【課題】広葉樹、針葉樹の木材、剪定枝、草木などに含まれるきのこ菌糸に対する成長阻害物質を分解除去するきのこ類培地基材の製造方法を提供する。【解決手段】広葉樹、針葉樹の木材、剪定枝、草木などを粉砕したおが粉やチップなどの木質系材料を密閉容器内に充填し、容器内を飽和水蒸気圧曲線上の一定温度、一定圧力に保ち、さらに冷水シャワーを密閉容器内に噴射し木質系材料に水蒸気の衝撃波を与え植物組織の加水分解反応を促進し、木質系材料中に含まれる菌糸の成長阻害物質を、気体あるいは液体として木質系材料の外部に流出させ、実質的にリグニンとセルロースのみの菌成長阻害成分のない木質系材料を得きのこ類の人工培地に用いる培地基材の製造方法。【選択図】図1
