【摘要】 木葡聚糖(XyG)是一种存在于所有陆生植物细胞壁中的基质多糖,是双子叶植物初生细胞壁中含量(20%–25%,w/w)最丰富的半纤维素成分。作为细胞壁的组分, XyG不仅与植物的生长发育密切相关,还在植物抵抗各种生物和非生物逆境过程中发挥重要作用。XyG代谢相关基因主要通过改变植物细胞壁的组成以及对细胞壁进行重排进而改变细胞壁的弹性/硬度等特性,影响植物的抗逆性。XyG及其寡糖也可能作为信号分子,或与其它信号分子协同作用应对逆境胁迫。该文概述了XyG的结构与类型及参与XyG生物合成与降解的相关基因,重点阐述XyG相关基因应答生物和非生物胁迫的作用机制。更多还原

【Abstract】 Xyloglucan(XyG) is a matrix polysaccharide present in the cell wall of all land plants. It is the most abundant hemicellulose in the primary cell walls of dicots(20%–25%, w/w). As a very important plant cell wall component, XyG is not only involved in plant growth and development, but also plays important roles in responses of plants to various abiotic and biotic stresses. The use of genes involved in Xy G biosynthesis and degradation possibly improve the tolerance of plants to stresses through influencing the cell wall structure(remodelling) and compositions. In addition, XyG and XyG oligosaccharides likely act as signaling molecules or cooperate with other signaling molecules to induce plant resistance. Here, we review the structure and variety of XyG, the genes involved in XyG biosynthesis and degradation, and advances in potential roles of XyG and XyG-related genes in responses to biotic and abiotic stresses.更多还原