Cellulose microfibril aggregates and their size variation with cell wall type
Cellulose microfibril aggregates and their size variation with cell wall type
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DOI：
10.1007/s00226-006-0121-6
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发表时间：
2007-06-01
影响因子：
3.4
通讯作者：
Donaldson, Lloyd
中科院分区：
文献类型：
--
作者：
Donaldson, Lloyd
木材细胞壁组分的组织涉及纤维素微纤丝和称为大纤丝的基质的聚集体。场发射电子显微镜和环境扫描电子显微镜的组合被用来可视化的组织中不同的细胞壁类型比较正常和反应木材的辐射松和白杨作为一个典型的软木和硬木的例子。大纤丝的大小显示出不同的细胞壁类型与最小的结构发生在凝胶层的张力木材（14 nm）和最大的结构中的S2（L）层的压缩木材（23 nm）。观察到大纤丝大小和木质化程度之间的正相关性，在更高度木质化的细胞壁类型中，大纤丝的大小明显增加。次生壁的原纤维结构从3-4 nm的微纤维大小的结构变化到60 nm直径的大聚集体。在相同细胞壁类型的相邻细胞中，大纤丝的大小也略有不同。大纤丝主要以随机排列出现，尽管有时在单个细胞中可以看到径向和切向层。
The organization of wood cell wall components involves aggregates of cellulose microfibrils and matrix known as macrofibrils. A combination of field emission electron microscopy and environmental scanning electron microscopy was used to visualise the organization of macrofibrils in different cell wall types comparing normal and reaction wood of radiata pine and poplar as examples of a typical softwood and hardwood. The size of macrofibrils is shown to vary among cell wall types with the smallest structures occurring in the gelatinous layer of tension wood (14 nm) and the largest structures in the S2(L) layer of compression wood (23 nm). A positive correlation between macrofibril size and degree of lignification is observed, with macrofibrils apparently increasing in size in more highly lignified cell wall types. The fibrillar structure of the secondary wall varies from microfibril-sized structures of 3-4 nm up to large aggregates of 60 nm diameter. The size of macrofibrils also varies slightly among adjacent cells of the same cell wall type. Macrofibrils occur predominantly in a random arrangement, although radial and tangential lamellae may sometimes be seen in individual cells.