PROBLEM TO BE SOLVED: To provide a method for producing a clone seedling by which formation of adventitious roots from the shoot of a plant is promoted to improve its germination ratio so as to improve the productivity of the clone seedling obtained by cutting technique, in particular a clone seedling belonging to plant species with a low germination ratio.SOLUTION: The method for producing a clone seedling includes: making a support medium having a liquid-retaining ratio of not more than 80% expressed by the following equation 1: the liquid retaining ratio (%)=[the saturated mass of a liquid retainable in the support medium/(the saturated mass of the liquid retainable in the support medium+the dry mass of the support medium)]×100, retain water and/or a liquid culture medium to prepare a germination bed inserting the shoot of a plant into the germination bed to culture the shoot and forming adventitious roots from the shoot. A method for preparing a germination bed for inserting the shoot of a plant includes making the support medium retain water and/or liquid culture medium.COPYRIGHT: (C)2012,JPO&INPIT【課題】植物のシュートからの不定根の形成を促進して、その発根率を向上させることにより、挿し木法などによるクローン苗、特に発根能が低い植物種に属するクローン苗の生産性を向上させることを目的する。【解決手段】式1(液体保持率(%)={支持体に保持され得る液体の飽和質量/(支持体に保持され得る液体の飽和質量+支持体の乾燥質量)}×100)で表される液体保持率が80%以下である支持体に、水および/または液体培地を保持させて発根床を調整し、植物のシュートを挿し付けて培養し、前記シュートから不定根を形成させるクローン苗の生産方法、及び、上記支持体に、水および/または液体培地を保持させる、植物のシュート挿し付け用発根床の調製方法。【選択図】なし
