综述了离子转运体系促进植物Na+动态平衡的分子机制,并对盐生植物和淡土植物对盐应答反应和运输中的基因功能进行了比较.将盐生植物中独特的耐盐转运蛋白基因和下游调控基因作为潜在的遗传资源,可为进一步的作物耐盐遗传改良服务.

Under salt stress,plants maintain a high concentration of K+and a low concentration of Na+in the cytosol. They do this by regulating the expression and activity of K+and Na+transporters and of H+pumps that generate the driving force for transport. Although salt-stress sensors remain elusive,some of the intermediary signaling components have been identified. Evidence suggests that a protein kinase complex consisting of the myristoylated calcium-binding protein SOS3 and the serine / threonine protein kinase SOS2 is activated by a salt-stress elicited calcium signal.The protein kinase complex then phosphorylates and activates various ion transporters,such as the plasma membrane Na+/ H+antiporter SOS1.