生态与农村环境学报2026，Vol.42Issue(8)：1137-1148,12.DOI:10.19741/j.issn.1673-4831.2025.0187
镉(Cd)胁迫对龙葵根、叶半纤维素和纤维素结构及Cd固定的影响
Structural Changes and Cd Fixation Mechanisms of Hemicellulose and Cellulose in Roots and Leaves of Solanum nigrum under Cadmium(Cd)Stress
摘要
Abstract
To investigate the structural changes of hemicellulose and cellulose under cadmium(Cd)stress and their im-pacts on Cd immobilization,this study examined the Cd enrichment capacity and polysaccharide property alterations of hemicellulose and cellulose in leaves and roots of Solanum nigrum.The results show that,overall,the Cd-binding capacity of the two polysaccharides in the leaf cell walls of the 100 μmol·L-1 Cd treatment group was significantly increased by an average of approximately 1.21 times compared with that of the 50 μmol·L-1 Cd treatment group;however,there was no significant difference in the Cd-binding capacity of the two polysaccharides in the roots(P>0.05).Hemicellulose played a more important role in the Cd immobilization process of the cell walls in both roots and leaves,with the average Cd en-richment in roots and leaves reaching 2.97 times that of cellulose.For hemicellulose,its content progressively increased with Cd stress intensity,accompanied by a reduction in xyloglucan(the primary backbone component)and increased pro-portions of galactose and mannose in polysaccharide composition.FTIR spectroscopy revealed peak shifts corresponding to hydroxyl and carboxyl groups under Cd stress,indicating their involvement in Cd immobilization.The elevated activities of hemicellulase/xyloglucanase under Cd stress exposed additional Cd-binding sites.Uronic acid analysis suggested extensive cross-linking between hemicellulose and other cell wall components,potentially providing additional Cd-binding sites.Re-garding cellulose,hydroxyl groups on sugar chains demonstrated limited Cd immobilization capability,though with relative-ly low overall contribution.Under Cd stress,both cellulose content and polysaccharide molecular weight substantially in-creased in roots,primarily serving structural support and physical barrier functions.关键词
龙葵/Cd胁迫/纤维素/半纤维素Key words
Solanum nigrum/Cd stress/cellulose/hemicellulose分类
资源环境引用本文复制引用
孙彗博,滕跃..镉(Cd)胁迫对龙葵根、叶半纤维素和纤维素结构及Cd固定的影响[J].生态与农村环境学报,2026,42(8):1137-1148,12.基金项目
江苏省自然科学基金面上项目(BK20191337) （BK20191337）
