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  • 1.
    Chang, Shan-Shan
    et al.
    Université Montpellier, France.
    Salmen, Lennart
    RISE, Innventia.
    Olsson, Anne-Mari
    RISE, Innventia.
    Clair, Bruno
    Université Montpellier, France.
    Deposition and organisation of cell wall polymers during maturation of poplar tension wood by FTIR microspectroscopy2014In: Planta, ISSN 0032-0935, E-ISSN 1432-2048, Vol. 239, no 1, p. 243-254Article in journal (Refereed)
    Abstract [en]

    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 S2 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 S2 wall throughout the whole process. In tension wood, the lignin was more highly oriented in the S2 layer than in opposite wood.

  • 2.
    Olsson, A.-M.
    et al.
    RISE, Innventia.
    Bjurhager, I.
    RISE, Innventia.
    Gerber, L.
    Sundberg, B.
    Salmen, L.
    RISE, Innventia.
    Ultra-structural organisation of cell wall polymers in normal and tension wood of aspen revealed by polarisation FTIR microspectroscopy2011In: Planta, ISSN 0032-0935, E-ISSN 1432-2048, no 6, p. 1277-1286Article in journal (Refereed)
  • 3.
    Peng, H.
    et al.
    Research Institute of Wood Industry of Chinese Academy of Forestry, China.
    Salmen, Lennart
    RISE - Research Institutes of Sweden, Bioeconomy.
    Stevanic Srndovic, Jasna
    RISE - Research Institutes of Sweden, Bioeconomy.
    Lu, J.
    Research Institute of Wood Industry of Chinese Academy of Forestry, China.
    Structural organization of the cell wall polymers in compression wood as revealed by FTIR microspectroscopy2019In: Planta, ISSN 0032-0935, E-ISSN 1432-2048, Vol. 250, no 1, p. 163-171Article in journal (Refereed)
    Abstract [en]

    Main conclusion: Glucomannan was more strongly oriented, in line with the orientation of cellulose, than the xylan in both compression wood and normal wood of Chinese fir. Lignin in compression wood was somewhat more oriented in the direction of the cellulose microfibrils than in normal wood. The structural organization in compression wood (CW) is quite different from that in normal wood (NW). To shed more light on the structural organization of the polymers in plant cell walls, Fourier Transform Infrared (FTIR) microscopy in transmission mode has been used to compare the S2-dominated mean orientation of wood polymers in CW with that in NW from Chinese fir (Cunninghamia lanceolata). Polarized FTIR measurements revealed that in both CW and NW samples, glucomannan and xylan showed a parallel orientation with respect to the cellulose microfibrils. In both wood samples, the glucomannan showed a much greater degree of orientation than the xylan, indicating that the glucomannan has established a stronger interaction with cellulose than xylan. For the lignin, the absorption peak also indicated an orientation along the direction of the cellulose microfibrils, but this orientation was more pronounced in CW than in NW, indicating that the lignin is affected by the orientation of the cellulose microfibrils more strongly in CW than it is in NW.

  • 4.
    Peng, Hui
    et al.
    Research Institute of Wood Industry of Chinese Academy of Forestry, China.
    Salmen, Lennart
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Stevanic Srndovic, Jasna
    RISE - Research Institutes of Sweden, Bioeconomy, Biorefinery and Energy.
    Lu, Jianxiong
    Research Institute of Wood Industry of Chinese Academy of Forestry, China.
    Structural organization of the cell wall polymers in compression wood as revealed by FTIR microspectroscopy2019In: Planta, ISSN 0032-0935, E-ISSN 1432-2048, Vol. 250, no 1, p. 163-171Article in journal (Refereed)
    Abstract [en]

    Glucomannan was more strongly oriented, in line with the orientation of cellulose, than the xylan in both compression wood and normal wood of Chinese fir. Lignin in compression wood was somewhat more oriented in the direction of the cellulose microfibrils than in normal wood.

    The structural organization in compression wood (CW) is quite different from that in normal wood (NW). To shed more light on the structural organization of the polymers in plant cell walls, Fourier Transform Infrared (FTIR) microscopy in transmission mode has been used to compare the S2-dominated mean orientation of wood polymers in CW with that in NW from Chinese fir (Cunninghamia lanceolata). Polarized FTIR measurements revealed that in both CW and NW samples, glucomannan and xylan showed a parallel orientation with respect to the cellulose microfibrils. In both wood samples, the glucomannan showed a much greater degree of orientation than the xylan, indicating that the glucomannan has established a stronger interaction with cellulose than xylan. For the lignin, the absorption peak also indicated an orientation along the direction of the cellulose microfibrils, but this orientation was more pronounced in CW than in NW, indicating that the lignin is affected by the orientation of the cellulose microfibrils more strongly in CW than it is in NW.

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