Analysis of static bending-induced compression wood formation in juvenile Picea omorika (Pančić) Purkynĕ
- 250 Downloads
Young P. omorika trees subjected to static bending showed a severe compression wood response as characterized by fluorescence spectroscopy/microscopy, which decreased in severity with height correlated with a decrease in bending moment.
This investigation is aimed at understanding the reaction wood response in a slow-growing conifer species under conditions of severe and long-term bending stress. Compression wood (CW) formation was studied in stems of juvenile P. omorika after trees were subjected to static bending by wiring at an angle of about 90 degrees, for 1 year. The applied static bending would correspond to the impact of winter snow loads or snow falls on juvenile conifers. Stem sections were collected during one growing season and examined by fluorescence microscopy, and fluorescence spectroscopy including deconvolution analysis. Trees exposed to bending produced large amounts of severe CW but very low amounts of opposite wood (OW) during the experimental season indicating a dramatic change in biomass distribution compared to control trees. Indicators of cell wall structure changes, such as fluorescence emission spectra, peak intensities, and shifts in the positions of the long-wavelength spectral components, decreased from the stem base to the top of the stem, in line with a calculated decrease in bending moment.
KeywordsCompression wood Fluorescence spectroscopy Galactan Lignin Opposite wood Picea omorika (Pančić) Purkynĕ
Approximation of the probability density
This work was financed by the grants ON173017 and ON173040 from the Ministry of the Education and Science of the Republic of Serbia, the grant from the Ministry of Business, Innovation and Employment, New Zealand and a sabbatical for Dr Ksenija Radotić from Scion, New Zealand in March–April 2012.
Conflict of interest
The authors declare that they have no conflict of interest.
- Konschin H, Sundholm F (1974) Protolytic dissociation of electronically excited phenols related to lignin. II. Isoeugenol and coniferyl alcohol. Finn Chem Lett 1:46–49Google Scholar
- Nanayakkara B, Lagane F, Hodgkiss P, Dibley M, Smaill S, Riddell M, Harrington J, Cown D (2014) Effects of induced drought and tilting on biomass allocation, wood properties, compression wood formation and chemical composition of young Pinus radiata genotypes (clones). Holzforschung 68:455–465CrossRefGoogle Scholar
- Olmstead JA, Gray DG (1997) Fluorescence spectroscopy of cellulose, lignin and mechanical pulps: a review. J Pulp Paper Sci 23:571–581Google Scholar