Abstract
Polarisation Fourier transform infra-red (FTIR) microspectroscopy was used to characterize the organisation and orientation of wood polymers in normal wood and tension wood from hybrid aspen (Populus tremula × Populus tremuloides). It is shown that both xylan and lignin in normal wood are highly oriented in the fibre wall. Their orientation is parallel with the cellulose microfibrils and hence in the direction of the fibre axis. In tension wood a similar orientation of lignin was found. However, in tension wood absorption peaks normally assigned to xylan exhibited a 90° change in the orientation dependence of the vibrations as compared with normal wood. The molecular origin of these vibrations are not known, but they are abundant enough to mask the orientation dependence of the xylan signal from the S2 layer in tension wood and could possibly come from other pentose sugars present in, or associated with, the gelatinous layer of tension wood fibres.
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Abbreviations
- FTIR:
-
Fourier transform infra-red
- G-layer:
-
Gelatinous layer
- MFA:
-
Microfibril angle
- n :
-
Statistical number of samples
- RA:
-
Relative absorbance
- S2 :
-
Layer secondary middle layer
- SD:
-
Standard deviation
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Acknowledgments
This work was performed within Biomime, the Swedish Centre for Biomimetic Fibre Engineering, a multidisciplinary Centre of Excellence comprising collaborative groups from the Schools of Biotechnology and Chemical Science and Engineering at The Royal Institute of Technology (KTH), the Umeå Plant Science Centre (UPSC) and Innventia. Funding was also supplied through FuncFiber—a FORMAS funded excellence centre in wood science, Bio4Energy as well as the Wallenberg Wood Science Center (WWSC) of the KTH, Royal Institute of Technology, and Chalmers, Sweden.
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Olsson, AM., Bjurhager, I., Gerber, L. et al. Ultra-structural organisation of cell wall polymers in normal and tension wood of aspen revealed by polarisation FTIR microspectroscopy. Planta 233, 1277–1286 (2011). https://doi.org/10.1007/s00425-011-1384-1
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DOI: https://doi.org/10.1007/s00425-011-1384-1