Nobuo Yoshizawa, Hiromi Ohba, Junko Uchiyama, Shinso Yokota
Deposition of Lignin in Differentiating Xylem Cell Walls of Normal and Compression Wood of Buxus microphylla var. insularis Nakai
Summary
The deposition process of lignins within differentiating xylem walls of normal and compression wood
of Buxus microphylla var. insularis Nakai was examined by visible-light microspectrophotometry
coupled with the Wiesner and Mäule reactions. Buxus formed compression wood on the underside of
the leaning stems. The secondary walls of the vessels and fibre tracheids in compression wood showed
an intense lignification in the outer region of S2 layer. The spectra of tissues after Mäule and Wiesner
reactions showed absorption maxima of around 515 nm and 570 nm, respectively. In differentiating
xylem cells of normal wood, lignin composed of both guaiacyl and syringyl units was deposited mainly
during the S2 thickening and after formation of the S3 layer in fibre tracheids, whereas in vessels it was
actively deposited mainly during the S2 thickening. In compression wood, the deposition of the lignin
composed of guaiacyl units was observed for a long period from the early stages of the S2 thickening.
Lignification was becoming particularly active at the outer portion of S2 layer after completion of the
S2 thickening in both vessels and fibre tracheids. On the other hand, the syringyl units were deposited
mainly during the S2 thickening in both cell types.
Holzforschung, Walter de Gruyter
Print ISSN: 0018-3830
Volume: 53, 03/1999
Pages: 156 - 160
Show full article (external site)
Show all available items of this journal
Search
