A tracheid is a long and tapered lignified cell in the xylem of vascular plants. It is a type of conductive cell called a tracheary element. Angiosperms also use another type of conductive cell, called vessel elements, to transport water through the xylem.

管胞(tracheid) 是绝大部分 蕨类植物 和 裸子植物 的主要输水机构。多数 被子植物 中，管胞和导管两种成分可以同时存在于 木质部 内。

管胞 （英語： Tracheid），又稱 假導管[1]，是 維管束植物 木質部 中一種長形、 木質化 的細胞，其名稱最早於1863年由德國植物學家 卡爾·古斯塔夫·薩尼歐 （西班牙语：Carl Gustav Sanio） 使用，來自 德文 的 Tracheide[2]。 管胞的 細胞壁 上常有 壁孔 （英语：Pit (botany)） （又稱紋孔或導孔）或飾紋，成熟後不具 原生質體，主要功能為進行 水分與無機鹽的運輸，以及提供樹木的 …

tracheid, in botany, primitive element of xylem (fluid-conducting tissues), consisting of a single elongated cell with pointed ends and a secondary, cellulosic wall thickened with lignin (a chemical binding substance) containing numerous pits but having no perforations in the primary cell wall.

管胞tracheid：是绝大部分蕨类植物和裸子植物的唯一输水组织。 多数被子植物中，管胞可同时存在于木质部中。 呈长梭形，次生壁的木质化和增厚方式与导管相似。

The tracheid is the basic cell in the xylem, that is, all plants have tracheids, but not the more highly evolved vessel elements. Tracheids are generally spindle shaped, very elongate, and have tapered ends.

2025年1月30日 · What Is A Tracheid? A tracheid is a type of water-conducting cell found in vascular plants. It helps in transporting water and minerals. How Do Tracheids Function? Tracheids function by allowing water to move from cell to cell through pits. This aids in the plant’s water transport system. Where Are Tracheids Found?

2021年6月28日 · Tracheid cells are tube-like with tapering ends. The average length is 5 to 6 mm. The cells have primary and secondary cell walls. The secondary cell wall is lignified and forms in between the primary cell wall and the plasma membrane in various thickening patterns. The most common patterns are annular, spiral, scalariform, reticulate, and pitted.

2014年5月29日 · To reach this goal, we assess the kinetics (duration and rate) of tracheid differentiation processes (enlargement and secondary wall formation) over several growing seasons, and model the relationships between the kinetics and the resulting tracheid features (cell diameter and cell wall thickness) and wood structure (wood density profile).

2011年7月12日 · Like their nearest relatives the conifers, modern ferns possess tracheid-based xylem but the structure–function relationships of fern xylem are poorly understood. Here, we sampled the fronds (megaphylls) of 16 species across the fern phylogeny, and examined the relationships among hydraulic transport, drought-induced cavitation resistance ...