Distribution of lignin interunit bonds in the differentiating xylem of compression and normal woods of Pinus thunbergii
Distribution of lignin interunit bonds in the differentiating xylem of compression and normal woods of Pinus thunbergii
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DOI：
10.1007/s10086-004-0644-0
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发表时间：
2005-06
影响因子：
2.9
通讯作者：
Kaori Saito;K. Fukushima
中科院分区：
文献类型：
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作者：
Kaori Saito;K. Fukushima
采用硫代酸解-脱硫法研究了黑松压缩材和正常材次生木质部的木质化过程及细胞壁分化不同阶段木质素的分布。我们准备了50微米厚的松树嫩枝的连续切向切片，从形成层区一直切到成熟的木质部。在压缩木中，未缩合的愈创木基（G）和对羟基苯基（H）木质素从木质化的早期到晚期同时沉积。在压缩材中检测到不同类型的G-G、G-H和H-H二聚体，且G-H和H-H二聚体占二聚体总量的比例随木质化程度的增加而增加。与此相反，未凝聚和凝聚的H单位在正常木材中检测到微量。木质素单元间的联系的相对分布的显着差异，没有观察到压缩和正常的木材之间或分化和成熟的木质素在压缩或正常的木材。
The lignification process and lignin distribution at different stages of cell wall differentiation in the secondary xylem of compression and normal woods ofPinus thunbergiiwere investigated by thioacidolysis and subsequent desulfuration. We prepared 50-µm-thick, contiguous tangential sections of pine shoots, cut from the cambial zone through to mature xylem. In compression wood, uncondensed guaiacyl (G) andp-hydroxyphenyl (H) lignins were deposited simultaneously from early to late stages of lignification. The various types of G-G, G-H, and H-H dimers were detected in compression wood, and the ratio of G-H and H-H dimers to total dimers increased as lignification proceeded. In contrast, uncondensed and condensed H units were detected in trace amounts in normal wood. Significant differences in the relative distributions of lignin interunit linkages were not observed between compression and normal woods or between differentiating and mature xylems in either compression or normal woods.