An underground stem that stores nutrients such as starch and swells into a spherical, egg-shaped, or elliptical shape. It grows underground in plants such as taro and gladiolus, and survives even when the above-ground parts die, becoming overwintering organs that germinate the following year for vegetative reproduction. It cannot be strictly distinguished from a tuber, but it generally has characteristics such as a vertical axis and germination only from the tip. On the other hand, it is similar to a bulb, and both are called bulbs in horticulture, but bulbs have fleshy leaves while corms have swollen stems. [Fukuda Taiji] Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend |
地下茎がデンプンなどの養分を貯蔵して球形、卵形、楕円(だえん)体などの形に肥大したもの。サトイモ、グラジオラスなどの地下にでき、地上部が枯れても生き残って越冬器官となり、翌年には発芽して栄養繁殖を行う。塊茎(かいけい)との厳密な区別はできないが、概して軸が垂直でその頂端だけから発芽するなどの特徴がある。一方、鱗茎(りんけい)とも類似し、園芸ではともに球根とよばれるが、鱗茎は葉が多肉であるのに対し、球茎は茎が肥大している。 [福田泰二] 出典 小学館 日本大百科全書(ニッポニカ)日本大百科全書(ニッポニカ)について 情報 | 凡例 |
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