tracheid

仮導管、仮道管

関

tracheary

　

WordNet

1. long tubular cell peculiar to xylem

Wikipedia preview

出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/08/09 12:02:39」(JST)

wiki en

[Wiki en表示]

Tracheid of oak shows pits along the walls. It is longer than a vessel element and has no perforation plates.

Tracheids are elongated cells in the xylem of vascular plants that serve in the transport of water and mineral salts. Tracheids are one of two types of tracheary elements, vessel elements being the other. Tracheids, unlike vessel elements, do not have perforation plates.

All tracheary elements develop a thick lignified cell wall, and at maturity the protoplast has broken down and disappeared. The presence of tracheary elements is the defining characteristic of vascular plants to differentiate them from non-vascular plants. The two major functions that tracheids may fulfill are contributing to the transport system and providing structural support. The secondary walls have thickenings in various forms—as annular rings; as continuous helices (called helical or spiral); as a network (called reticulate); as transverse nets (called scalariform); or, as extensive thickenings except in the region of pits (called pitted).

Tracheids provide most of the structural support in softwoods, where they are the major cell type.

Because tracheids have a much higher surface to volume ratio compared to vessel elements, they serve to hold water against gravity (by adhesion) when transpiration is not occurring. This is likely one mechanism that helps plants prevent air embolisms.

References

Further reading

• Wilson, K. & D.J.B. White (1986). The Anatomy of Wood: its Diversity and variability. Stobart & Son Ltd, London

External links

• Pictures of softwood tracheids in cross section and in maceration; both in pine.

English Journal

• The Soybean Mycorrhiza-Inducible Phosphate Transporter Gene, GmPT7, also Shows Localized Expression at the Tips of Vein Endings of Senescent Leaves.

• Inoue Y1, Kobae Y2, Omoto E1, Tanaka A1, Banba M1, Takai S1, Tamura Y1, Hirose A3, Komatsu K3, Otagaki S1, Matsumoto S1, Taniguchi M1, Masuta C4, Ishimoto M5, Hata S6.
• Plant & cell physiology.Plant Cell Physiol.2014 Oct 4. pii: pcu138. [Epub ahead of print]
• GmPT7 was originally identified as an arbuscular mycorrhiza-inducible gene of soybean that encodes a member of subfamily I in the PHOSPHATE TRANSPORTER 1 family. In the present study, we established conditions under which a number of dwarf soybean plants complete their life cycles in a growth chambe
• PMID 25282557

• Climatic influences on wood anatomy and tree-ring features of Great Basin conifers at a new mountain observatory.

• Ziaco E1, Biondi F2, Rossi S3, Deslauriers A3.
• Applications in plant sciences.Appl Plant Sci.2014 Oct 2;2(10). pii: apps.1400054. doi: 10.3732/apps.1400054. eCollection 2014.
• •PREMISE OF THE STUDY: A network of mountain observing stations has been installed in the Great Basin of North America. NevCAN (Nevada Climate-ecohydrological Assessment Network), which spans a latitudinal range of 2.5° and two elevation ranges of about 2000 m each, enabled us to investigate tree
• PMID 25309838

• Kinetics of tracheid development explain conifer tree-ring structure.

• Cuny HE1, Rathgeber CB, Frank D, Fonti P, Fournier M.
• The New phytologist.New Phytol.2014 Sep;203(4):1231-41. doi: 10.1111/nph.12871. Epub 2014 May 29.
• Conifer tree rings are generally composed of large, thin-walled cells of light earlywood followed by narrow, thick-walled cells of dense latewood. Yet, how wood formation processes and the associated kinetics create this typical pattern remains poorly understood. We monitored tree-ring formation wee
• PMID 24890661

Japanese Journal

• 木材細胞壁形成における細胞壁成分供給の日周性

• 細尾 佳宏
• 木材学会誌 58(3), 109-117, 2012-05
• NAID 40019336656

• Effect of light intensity on diurnal differences in the supply of cell wall components to the innermost surface of developing S_2 layers of tracheids in Cryptomeria japonica

• HOSOO Yoshihiro,YOSHIDA Masato,YAMAMOTO Hiroyuki
• Journal of wood science 57(5), 345-351, 2011-10-25
• NAID 10030450732

Related Links

• Tracheid | Define Tracheid at Dictionary.com

(trā'kē-ĭd, -kēd') An elongated, water-conducting cell in xylem, one of the two kinds of tracheary elements. Tracheids have pits where the cell wall is modified into a thin membrane, across which water flows from tracheid to tracheid.

• Tracheid dictionary definition | tracheid defined

N, One side of the end of hydroid (tracheid) of a Pteridophyte (fern), with scalariform pits. P, Part of spiral hydroid (tracheid) of Phanerogam (Flowering Plant). The pits may be separated by a network of thickenings when the tracheid is ...

Related Pictures

---

★リンクテーブル★

リンク元	「tracheary」「仮導管」「仮道管」

「tracheary」

　　[★]

• adj.

• 気管の、管状の、仮導管の

関

canalicular、trachea、tracheae、tracheal、tracheal tube、trachealis、tracheid、tubular

「仮導管」

　　[★]

英

tracheid、tracheary

関

仮道管、管状、気管

「仮道管」

　　[★]

英

tracheid

関

仮導管