黄藤材纤维细胞木质素分布

为提高我国棕榈藤资源高附加值加工利用水平,以我国特有的黄藤为研究对象,运用可见光显微分光光度计,对不同生长时期、不同位置的黄藤纤维细胞及细胞壁微区木质素含量与分布进行研究。结果表明:随着藤龄的增加,纤维细胞次生壁及角隅处S基木质素含量均呈现出“增—降—增”的变化趋势,而S和G两种木质素总含量基本上呈不断增加的变化趋势。径向纤维次生壁及角隅处木质素含量变化趋势完全一致,且纤维细胞角隅处木质素含量高于次生壁; 其中,S基木质素含量均呈中部>外部>内部的变化趋势,S基和G基木质素总量均呈内部>中部>外部的变化趋势。在藤茎内部和中层,纤维鞘中由外向内木质素含量均呈先增后降的变化趋势; 但藤茎外层纤维鞘中S基木质含量呈不断降低的变化趋势,而S基和G基木质素总量却呈现不断增加的变化趋势。纤维细胞壁各微区的木质素含量为次生壁<初生壁<胞间层。

Lignin distribution of Daemonorops margaritae fiber

In order to improve the processing and utilization level of high added value of Chinese rattan resources, the Daemonorops margaritae, Chinese unique rattan, was chosen as the research material to study the distribution and content of lignin in fiber cell and the micro-morphological regions of fiber cell wall in the different position and in the different growing period. The results showed that the S-type lignin content in secondary wall and cell corner of the fiber had a trend of “increasing-decreasing-increasing” along axial direction downward with the age increasing, while the total content of S-type lignin and G-type lignin tended to increase continuously. In the radial direction, the lignin content in fiber cell secondary wall had exactly the same variation trend with that in fiber cell corner, and the lignin content in fiber cell corner was higher than that in fiber cell secondary wall, where the S-lignin content was the highest in middle part, then higher in cortex and then in core, while the total content of S-type lignin and G-type lignin, from high to low in order, were both in core, in middle and in cortex in sequence. From outside to the inner part of fibrous sheath, the lignin content had a trend of increasing first and then decreasing in the core and middle part of the cane. While the S-lignin content decreased in the fibrous sheath of the cortex, in which the total content of S-type lignin and G-type lignin increased continuously. The lignin content in different micro-morphological regions of fiber cell wall was the lowest in the secondary wall, then was in primary wall and the highest on intercellular layer.