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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 S 2  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 S 2  thickening and after formation of the S 3  layer in fibre tracheids, whereas in vessels it was actively deposited mainly during the S 2  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 S 2  thickening. Lignification was becoming particularly active at the outer portion of S 2  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 S 2  thickening in both cell types.

Deposition of Lignin in Differentiating Xylem Cell Walls of Normal and Compression Wood of Buxus microphylla var. insularis Nakai