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Hierarchical structure of juvenile hybrid aspen xylem revealed using X-ray scattering and microtomography

(2012) TREES-STRUCTURE AND FUNCTION. 26(6). p.1793-1804
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Abstract
X-ray scattering and microtomography (mu CT) are useful techniques to reveal the structure of wood at the nano- and micrometer scales. The nanostructure of xylem in greenhouse-grown 2.5- to 3.5-month-old Populus tremula L. x tremuloides Michx. trees was characterized using wide-angle X-ray scattering (WAXS), and the cellular structure was investigated using mu CT. For comparison, the nanostructure of wood in 2-year-old silver birch, Norway spruce and Scots pine saplings was determined. Based on the mu CT results, the lengths of fiber lumina of the hybrid aspen saplings were shorter than any previous results on the lengths of wood fibers. The mean microfibril angles of the hybrid aspen saplings were significantly lower (8A degrees-14A degrees) than those of the birch, spruce and pine saplings (27A degrees-35A degrees) implicating that cellulose microfibrils were oriented nearly parallel to the cell axis in the young hybrid aspen saplings. Hybrid aspen saplings were found to contain tension wood based on the histochemical analysis and mu CT images. However, typical tension wood properties, i.e. larger crystallite width and higher crystallinity than in normal wood, were detected only in a few hybrid aspen samples, while in most of the hybrid aspen saplings, the crystallite widths (3.0 +/- A 0.1 nm) and the crystallinities (30 +/- A 5 %) corresponded to those of normal wood. The deformations of cellulose crystallites were determined using WAXS in situ upon dehydration of the never-dried samples. In all the species studied, the cellulose unit cell dimension decreased and disorder of cellulose chains increased parallel to the chains upon drying. Also, the transverse disorder of chains increased in birch, spruce and pine, while no changes were detected in this direction in hybrid aspen. The crystallite widths and drying deformation results might indicate that the gelatinous layer has not fully developed in the young hybrid aspen saplings.
Keywords
X-ray microtomography, WAXS, Juvenile wood, Hybrid aspen

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Citation

Please use this url to cite or link to this publication:

Chicago
Svedström, Kirsi, Jessica Lucenius, Jan Van den Bulcke, Denis Van Loo, Peter Immerzeel, Jussi-Petteri Suuronen, Loes Brabant, et al. 2012. “Hierarchical Structure of Juvenile Hybrid Aspen Xylem Revealed Using X-ray Scattering and Microtomography.” Trees-structure and Function 26 (6): 1793–1804.
APA
Svedström, K., Lucenius, J., Van den Bulcke, J., Van Loo, D., Immerzeel, P., Suuronen, J.-P., Brabant, L., et al. (2012). Hierarchical structure of juvenile hybrid aspen xylem revealed using X-ray scattering and microtomography. TREES-STRUCTURE AND FUNCTION, 26(6), 1793–1804.
Vancouver
1.
Svedström K, Lucenius J, Van den Bulcke J, Van Loo D, Immerzeel P, Suuronen J-P, et al. Hierarchical structure of juvenile hybrid aspen xylem revealed using X-ray scattering and microtomography. TREES-STRUCTURE AND FUNCTION. 2012;26(6):1793–804.
MLA
Svedström, Kirsi, Jessica Lucenius, Jan Van den Bulcke, et al. “Hierarchical Structure of Juvenile Hybrid Aspen Xylem Revealed Using X-ray Scattering and Microtomography.” TREES-STRUCTURE AND FUNCTION 26.6 (2012): 1793–1804. Print.
@article{2987718,
  abstract     = {X-ray scattering and microtomography (mu CT) are useful techniques to reveal the structure of wood at the nano- and micrometer scales. The nanostructure of xylem in greenhouse-grown 2.5- to 3.5-month-old Populus tremula L. x tremuloides Michx. trees was characterized using wide-angle X-ray scattering (WAXS), and the cellular structure was investigated using mu CT. For comparison, the nanostructure of wood in 2-year-old silver birch, Norway spruce and Scots pine saplings was determined. Based on the mu CT results, the lengths of fiber lumina of the hybrid aspen saplings were shorter than any previous results on the lengths of wood fibers. The mean microfibril angles of the hybrid aspen saplings were significantly lower (8A degrees-14A degrees) than those of the birch, spruce and pine saplings (27A degrees-35A degrees) implicating that cellulose microfibrils were oriented nearly parallel to the cell axis in the young hybrid aspen saplings. Hybrid aspen saplings were found to contain tension wood based on the histochemical analysis and mu CT images. However, typical tension wood properties, i.e. larger crystallite width and higher crystallinity than in normal wood, were detected only in a few hybrid aspen samples, while in most of the hybrid aspen saplings, the crystallite widths (3.0 +/- A 0.1 nm) and the crystallinities (30 +/- A 5 \%) corresponded to those of normal wood. The deformations of cellulose crystallites were determined using WAXS in situ upon dehydration of the never-dried samples. In all the species studied, the cellulose unit cell dimension decreased and disorder of cellulose chains increased parallel to the chains upon drying. Also, the transverse disorder of chains increased in birch, spruce and pine, while no changes were detected in this direction in hybrid aspen. The crystallite widths and drying deformation results might indicate that the gelatinous layer has not fully developed in the young hybrid aspen saplings.},
  author       = {Svedstr{\"o}m, Kirsi and Lucenius, Jessica and Van den Bulcke, Jan and Van Loo, Denis and Immerzeel, Peter and Suuronen, Jussi-Petteri and Brabant, Loes and Van Acker, Joris and Saranp{\"a}{\"a}, Pekka and Fagerstedt, Kurt and Mellerowicz, Ewa and Serimaa, Ritva},
  issn         = {0931-1890},
  journal      = {TREES-STRUCTURE AND FUNCTION},
  keyword      = {X-ray microtomography,WAXS,Juvenile wood,Hybrid aspen},
  language     = {eng},
  number       = {6},
  pages        = {1793--1804},
  title        = {Hierarchical structure of juvenile hybrid aspen xylem revealed using X-ray scattering and microtomography},
  url          = {http://dx.doi.org/10.1007/s00468-012-0748-x},
  volume       = {26},
  year         = {2012},
}

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