Paper Information

Journal:   JOURNAL OF SCIENCE (UNIVERSITY OF TEHRAN) (JSUT)   SPRING 2006 , Volume 32 , Number 1 (SECTION: BIOLOGY 1); Page(s) 13 To 22.
 
Paper: 

TENSION WOOD IN EUCALYPT TREES

 
 
Author(s):  TOGHRAEI N.*, PARSAPAZHOUH D., EBRAHIMZADEH H., THIBAUT B., GRIL J., YAZDANI MOGHADAM H.R.
 
* WOOD AND PAPER SCIENCE RESEARCH DIVISION, RESEARCH INSTITUTE OF FORESTS AND RANGELANDS, TEHRAN, IRAN
 
Abstract: 

Primary and secondary growths of main and lateral axes of Eucalyptus gunnii clone 634 young trees as well as some other aspects related to stem bending were studied in a small group of vertically left and inclined young trees and followed for a period of fourteen weeks. Although all the young trees, i.e. inclined and straight ones, did produce tension wood in the form of G-fibres, tilting was proved to be greatly effective in G-layer formation. Three different types of G-fibres were distinguished, with thin G-layer without an 53; with moderate to thick G-layer with an 53 and "faint" G-layer. The results of this experiment suggest that encountering the interior and exterior stresses the eucalypt employs at least three mechanisms: differentiating secondary xylem gelatinous fibres, eccentricity of growth compatible to G-fibres production and gelatinous fibres in phloem on the upper side of the leaned axes.

 
Keyword(s): TENSION WOOD, GELATINOUS LAYER, EUCALYPTUS GUNNII, G-FIBRE, SECONDARY, GROWTH, STEM INCLINATION
 
References: 
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