Na+/H+ 逆向转运蛋白与植物耐盐性关系

Na+/H+ 逆向转运蛋白与植物的耐盐性有密切的关系。在高等植物体内，主要存在两种Na+/H+ 逆向转运蛋白，分别为位于细胞质膜上的逆向转运蛋白SOS1，以及存在于液泡膜上的AtNHX1。质膜Na+/H+ 逆向转运蛋白主要负责Na+ 的外排，液泡膜Na+/H+ 逆向转运蛋白主要负责把Na+ 区隔化入液泡。过量表达质膜Na+/H+ 逆向转运蛋白SOS1或液泡膜Na+/H+ 逆向转运蛋白AtNHX1能够明显提高植物的耐盐性。本文对植物中Na+/H+ 逆向转运蛋白及其与植物耐盐性之间的关系研究最新进展作一概述。

Na+/H+ Antiporter and Its Relationship With Plant Salt Tolerance

Na+/H+antiporter plays an important role in plant salt toletance. There are two types of Na+/H+antiporter in plant. One is the SOS1, which localizes in plasma menbrance, the other is AtNHX1, which localized in tonoplast. The plasma menbrance Na+/H+antiporter is responsible for the transport of Na+ out of the cell, while the tonoplast Na+/H+antiporter is responsible for the transportion of Na+ from cytoplasm into vacuole. Therefore, these two types of antiporters were considered as key proteins for plant salt tolerance. Recently, many evidences have shown that overexpression of a plasma menbrance Na+/H+antiporter SOS1 and a tonoplast Na+/H+antiporter AtNHX1 can increase salt tolerance of plants. The latest progress in the study of Na+/H+antiporter and its relationship with plant salt tolerance were reviewed.