Titel
Mechanical stress as stimulus for structurally and chemically altered walls in wood xylem cells
Verfasser
Uwe Schmitt (*)
Claus Frankenstein (*)
Gerald Koch (*)
Erscheinungsort
Hamburg
Verlag
Max Wiedebusch
Erscheinungsjahr
2007
Illustrationen
12 Abb., 34 Lit. Ang.
Material
Artikel aus einer ZeitschriftUnselbständiges Werk
Standardsignatur
4370
Datensatznummer
200151618
Quelle
The Plant Cell Wall : Recent Advances and New Perspectives : Proceedings of the 2nd New Zealand-German Workshop on Plant Cell Walls; S. 119-128
Abstract
Cell walls in woody tissues affected by mechanical stress often display structural and chemical modifications. Electron microscopy and UV-microspectrophotometry were used to study modifications in the secondary xylem tissues caused by wounding and exposure to extreme wind. Wounding of hardwoods initiates wall modifications in already differentiated as well as differentiating xylem. Modifications include atypical wall architecture, increase in lignin content, and partial incorporation of phenolic compounds. In spruce trees, exposure to extreme wind often leads to the formation of so called 'Wulstholz' on the compression side of bent trees. Walls of 'Wulstholz' tracheids are mainly characterized by thickening of their secondary walls and also by an increasing lignin content. Modification of cell walls, as a response to mechanical stress, are a part of tree survival strategies.