Journal
PLANTA
Volume 239, Issue 1, Pages 243-254Publisher
SPRINGER
DOI: 10.1007/s00425-013-1980-3
Keywords
FTIR microscopy; Maturation; Orientation; Polarisation; Polymers; Populus tremula x P. alba; Tension wood
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Funding
- COST Action through the Short Term Scientific Mission (STSM) [FP0802]
- Scientific Council of Montpellier University
- Wallenberg Wood Science Center (WWSC)
- French National Research Agency [ANR-12-BS09-0004]
- Agence Nationale de la Recherche (ANR) [ANR-12-BS09-0004] Funding Source: Agence Nationale de la Recherche (ANR)
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To advance our understanding of the formation of tension wood, we investigated the macromolecular arrangement in cell walls by Fourier transform infrared microspectroscopy (FTIR) during maturation of tension wood in poplar (Populus tremula x P. alba, clone INRA 717-1B4). The relation between changes in composition and the deposition of the G-layer in tension wood was analysed. Polarised FTIR measurements indicated that in tension wood, already before G-layer formation, a more ordered structure of carbohydrates at an angle more parallel to the fibre axis exists. This was clearly different from the behaviour of opposite wood. With the formation of the S-2 layer in opposite wood and the G-layer in tension wood, the orientation signals from the amorphous carbohydrates like hemicelluloses and pectins were different between opposite wood and tension wood. For tension wood, the orientation for these bands remains the same all along the cell wall maturation process, probably reflecting a continued deposition of xyloglucan or xylan, with an orientation different to that in the S-2 wall throughout the whole process. In tension wood, the lignin was more highly oriented in the S-2 layer than in opposite wood.
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