毛竹（Phyllostachys edulis）茎木质部形成过程中半纤维素的特性。
Characterization of hemicelluloses in Phyllostachys edulis (moso bamboo) culm during xylogenesis.
机构信息
State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangzhou, 510642, China; Guangdong Key Laboratory for Innovative Development and Utilization of Forest Plant Germplasm, College of Forestry and Landscape Architectures, South China Agricultural University, Guangzhou, 510642, China.
The Key Laboratory of Plant Molecular Breeding of Guangdong Province, College of Agriculture, South China Agricultural University, Guangzhou, 510642, Guangdong, China.
出版信息
Carbohydr Polym. 2019 Oct 1;221:127-136. doi: 10.1016/j.carbpol.2019.05.088. Epub 2019 May 30.
Hemicelluloses are β-(1→4)-linked backbone polysaccharides found in plant cell walls that include xyloglucans, xylans, mannans and glucomannans, and play important roles in plant tissue configuration. In this study, hemicelluloses were isolated from the apical, middle and basal segments of 6 m Phyllostachys edulis culm using KOH and DMSO extraction procedures, respectively. Chemical composition and structural characterization of hemicellulosic fractions were comparatively investigated by a combination of HPLC, GPC, FT-IR, H-, C-, HSQC NMR and TGA techniques. Our results show that the main chain of hemicellulose in P. edulis consists of glucuronoarabinoxylans (GAXs) with backbone 1, 4-β-d-Xyl, and side chain arabinose, glucuronic acid and acetylation. Hemicellulose content and molecular weight increased with culm xylogenesis in P. edulis. Our results provide new insights on the dynamics of hemicellulose structure in culm xylogenesis in P. edulis.
半纤维素是植物细胞壁中存在的β-(1→4)-连接的骨架多糖，包括木葡聚糖、木聚糖、甘露聚糖和葡甘露聚糖，在植物组织构型中发挥重要作用。在这项研究中，分别使用 KOH 和 DMSO 提取程序从 6m 毛竹茎的顶端、中部和基部段分离半纤维素。通过 HPLC、GPC、FT-IR、H-、C-、HSQC NMR 和 TGA 技术的组合，比较研究了半纤维素级分的化学组成和结构特征。我们的结果表明，毛竹半纤维素的主链由带有 1,4-β-d-Xyl 主链和阿拉伯糖、葡萄糖醛酸和乙酰化侧链的葡醛酸阿拉伯木聚糖 (GAXs) 组成。半纤维素含量和分子量随着毛竹茎的木质部形成而增加。我们的结果为毛竹茎木质部形成过程中半纤维素结构的动态变化提供了新的见解。
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