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首页> 外文期刊>The New Phytologist >Gene expression in Eucalyptus branch wood with marked variation in cellulose microfibril orientation and lacking G-layers.
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Gene expression in Eucalyptus branch wood with marked variation in cellulose microfibril orientation and lacking G-layers.

机译：桉树分支木材中的基因表达在纤维素微纤丝方向上有明显变化，并且缺少G层。

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摘要

In response to gravitational stresses, angiosperm trees form tension wood in the upper sides of branches and leaning stems in which cellulose content is higher, microfibrils are typically aligned closely with the fibre axis and the fibres often have a thick inner gelatinous cell wall layer (G-layer). Gene expression was studied in Eucalyptus nitens branches oriented at 45 degrees using microarrays containing 4900 xylem cDNAs, and wood fibre characteristics revealed by X-ray diffraction, chemical and histochemical methods. Xylem fibres in tension wood (upper branch) had a low microfibril angle, contained few fibres with G-layers and had higher cellulose and decreased Klason lignin compared with lower branch wood. Expression of two closely related fasciclin-like arabinogalactan proteins and a beta-tubulin was inversely correlated with microfibril angle in upper and lower xylem from branches. Structural and chemical modifications throughout the secondary cell walls of fibres sufficient to resist tension forces in branches can occur in the absence of G-layer enriched fibres and some important genes involved in responses to gravitational stress in eucalypt xylem are identified.
机译：在重力作用下，被子植物在树枝和倾斜茎杆的上部形成张力木材，其中纤维素含量较高，微纤维通常与纤维轴紧密排列，纤维通常具有较厚的内胶状细胞壁层（G -层）。使用包含4900个木质部cDNA的微阵列，在45度定向的桉树分支中研究了基因表达，并通过X射线衍射，化学和组织化学方法揭示了木纤维的特征。张力木（上部分支）中的木质部纤维具有较低的微纤丝角，包含较少的具有G层的纤维，与下部分支木相比，具有较高的纤维素和较低的Klason木质素。两种紧密相关的法西林样阿拉伯半乳聚糖蛋白和β-微管蛋白的表达与分支的上木质部和下木质部中的微纤丝角成反比。在不存在富含G层的纤维的情况下，纤维的整个次级细胞壁的结构和化学修饰足以抵抗分支中的拉力，并且可以鉴定出一些对桉木木质部对重力的响应相关的重要基因。

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