脱水素在植物低温胁迫响应中的作用

脱水素(dehydrin)是一类胚胎发育后期丰富蛋白(LEA.late embryogenesis abundant proteins),含有富含赖氨酸的K片段,属于具有高度热稳定性的亲水性蛋白,在植物脱水条件下能保护细胞内蛋白质和膜结构免受破坏.低温胁迫下,耐低温植物细胞内部会发生一系列的生理生化反应来抵御低温所造成的伤害.很多研究表明植物脱水素的表达和积累与多种双子叶植物(包括草本和木本植物)以及冬季栽培的禾本科植物品种(特别是小麦和大麦)的耐低温能力密切相关.本文对近年来国内外关于脱水素的结构、功能以及内源ABA(abscisie acid)含量、拟南芥CBF(C-repeat binding factor)同源转录激活因子、春化基因、光周期信号等对脱水素基因的表达调控机制进行综述.

The Role of Dehydrin in Plant Response to Cold Stress

Dehydrins present a distinct biochemical group of late embryogenesis abundant(LEA) proteins characterized by the presence of a lysine-rich amino acid motif,the K-segment.They are hydrophilic proteins with high thermostability.It is proposed that dehydrins can protect proteins and membranes against unfavourable structure changes caused by dehydration in the plant cells.Cold induces many physiological and biochemical changes in the cells of freezing-tolerant plant species.It is demonstrated that the induction...