In the rice genome, there are at least five NHX members with OsNHX1-OsNHX4 belonging to the type-I and OsNHX5 to the type-II . The operation of the NHXs also affects the pH gradients across the different luminal compartments . Both type-I and type-II NHXs have different subcellular localization; they may have different mechanisms in salt …