Cellulose structure and lignin distribution in normal and compression wood of the Maidenhair tree (Ginkgo biloba L.)
Cellulose structure and lignin distribution in normal and compression wood of the Maidenhair tree (Ginkgo biloba L.)
复制标题
银杏树（Ginkgo biloba L.）正常木材和压缩木材中的纤维素结构和木质素分布
DOI：
10.1111/jipb.12349
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发表时间：
2015-04-01
影响因子：
11.4
通讯作者：
Saranpaa, Pekka
中科院分区：
文献类型：
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作者：
Andersson, Seppo;Wang, Yurong;Saranpaa, Pekka
我们详细研究了15年生银杏(Ginkgo biloba L.)从髓到皮的平均微纤丝角和纤维晶体宽度。用X-射线衍射法测定了纤维素微纤维相对于细胞轴线的取向以及纤维微晶的宽度和长度。用拉曼显微镜比较了正常木材/对生木材和压缩木材细胞壁中木质素的分布，发现木质素分布在髓附近。银杏S2层平均微纤丝角较大，在19°~39°之间变化，纤维微晶平均宽度为3.1~3.2 nm。髓附近可见轻度压缩的木材，无细胞间隙或螺旋腔。狭缝状的边缘凹坑开口和严重木质化的S2L层证实了压缩木材的存在。银杏在针叶树幼林中表现出典型的特征。在14个年轮中，微纤丝角保持较大。整个茎圆盘直径为18厘米，被认为是由幼木组成。幼龄材和压缩材的性质以及纤维素取向和结晶宽度表明，银杏的木材形成与现代针叶树相似。
We studied in detail the mean microfibril 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 microfibrils with respect to the cell axis and the width and length of cellulose crystallites were determined using X-ray 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 microfibril angle, varying between 19 degrees and 39 degrees in the S2 layer, and the average width of cellulose crystallites was 3.1-3.2nm. Mild compression wood without any intercellular spaces or helical cavities was observed near the pith. Slit-like bordered pit openings and a heavily lignified S2L layer confirmed the presence of compression wood. Ginkgo biloba showed typical features present in the juvenile wood of conifers. The microfibril angle remained large over the 14 annual rings. The entire stem disc, with a diameter of 18cm, 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.