A special modification of a plant that cannot stand upright on its own, allowing it to grow taller by wrapping itself around another object. When the stem itself wraps around another object, it is called a vine. Modified stems are found in grapes, peas, pumpkins, and barberry; modified leaf stalks are found in button vines and trumpet vines; modified leaflets are found in peas; whole leaves with tendrils that photosynthesize via a pair of stipules on both sides are found in Lathyrus aphaca , and modified roots are found in velvet vine. Modified organs are found in various taxonomic groups, regardless of lineage. Source: Heibonsha World Encyclopedia, 2nd Edition Information |
単独では直立できない植物体がその一部で他物に巻きついて高く伸長できるように特殊に変形したもの。茎自体が他物に巻きつく場合はつるという。茎が変形したものがブドウ,エンドウ,カボチャ,サルトリイバラなどに,葉のうち葉柄が変形したものがボタンヅル,ノウゼンハレンに,小葉の変形したものがエンドウに,葉全体が巻きひげになって光合成はその両側の1対の托葉によるものがレンリソウの1種Lathyrus aphacaに,根の変形したものがビロードカズラにと,いろいろの器官から変形したものが,さまざまの分類群に系統とは無関係にみられる。
出典 株式会社平凡社世界大百科事典 第2版について 情報 |
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