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Cellulose structure and lignin distribution in normal and compression wood of the Maidenhair tree(Ginkgo biloba L.)

Journal of Integrative Plant Biology 2015年第4期57卷 388-395页

作者： Seppo Andersson Yurong Wang Raili P?nni Tuomas H?nninen marko mononen Haiqing Ren Ritva Serimaa Pekka Saranp?? Department of Physics University of Helsinki Research Institute of Wood Industry Chinese Academy of Forestry Department of Forest Products Technology Aalto UniversitySchool of Chemical Technology VTT Technical Research Centre of Finland Natural Resources Institute Finland

We studied in detail the mean micro fibril angle and the width of cellulose crystals from the pith to the bark of a 15-year-old Maidenhair tree（Ginkgo biloba L.）. The orientation of cellulose micro fibrils with respect to the cell axis and the width and length of cellulose crystallites were determined using Xray diffraction. Raman microscopy was used to compare the lignin distribution in the cell wall of normal/opposite and compression wood, which was found near the pith. Ginkgo biloba showed a relatively large mean micro fibril angle,varying between 19° and 39° in the S2 layer, and the average width of cellulose crystallites was 3.1–3.2 nm. Mild compression wood without any intercellular spaces or helical cavities was observed near the pith. Slit-like bordered pit openings and a heavily lignified S2 L layer con firmed the presence of compression wood. Ginkgo biloba showed typical features present in the juvenile wood of conifers. The micro fibril angle remained large over the 14 annual rings. The entire stem disc,with a diameter of 18 cm, was considered to consist of juvenile wood. The properties of juvenile and compression wood as well as the cellulose orientation and crystalline width indicate that the wood formation of G. biloba is similar to that of modern conifers.

关键词： Cellulose structure cell wall compression wood lignin Maidenhair tree microfibril angle

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