Vascular cambium - Vascular cambium

Japanese: 維管束形成層 - いかんそくけいせいそう

…the meristem involved in the growth of stems and roots of trees. More accurately, it is called the vascular cambium, but it is also called the cambium simply. The shoot apex and root tip are called apical meristems, while the cambium and the cork cambium, which is involved in the formation of bark and produces cork tissue, are called lateral meristems. …

From [Meristem]

…In the case of adventitious buds and roots, the apical meristem also differentiates first. The apical meristem mainly produces cells in the axial direction of the plant body, while the lateral meristems, which produce cells perpendicular to the axis, i.e., responsible for the thickening of the plant, are called lateral meristems, and include the cambium (also called the vascular cambium) and the cork cambium. The cambium begins to differentiate between the xylem and phloem of the primary vascular bundles, which are made from cells derived from the apical meristem, and eventually becomes a ring-shaped cambium in the stem, producing secondary xylem (wood) on the inside and secondary phloem on the outside. …

*Some of the terminology that refers to the "vascular cambium" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…樹木の茎や根の肥大に関係する分裂組織。正確には維管束形成層というが，単に形成層ともいう。茎頂や根端を頂端分裂組織というのに対して，形成層と，樹皮の形成に関係してコルク組織をつくるコルク形成層とは側部分裂組織とよばれる。…

【分裂組織】より

…不定芽，不定根の場合にも頂端分裂組織がまず分化する。　頂端分裂組織はおもに植物体の軸方向への細胞の生産を行うが，一方，軸と直角の方向すなわち植物の肥大に関与する分裂組織は側部分裂組織とよばれ，形成層(維管束形成層ともいう)とコルク形成層がある。形成層は頂端分裂組織に由来する細胞からつくられる一次維管束の木部と師部とのあいだに分化をはじめ，結局は茎の中でリング状の形成層となり，その内側に二次木部(材)を，そして外側に二次師部をつくる。…

※「維管束形成層」について言及している用語解説の一部を掲載しています。

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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