Soil salinization and water shortage are serious environmental factors limiting the growth and productivity of agricultural crops worldwide. Drought and salinity are in a sense belong to the same osmotic stress, but salinity also have ion-excess effect in addition to the role of osmotic stress. High concentration of Na+ in the soil may inhibit plant growth for two main reasons:first, the presence of salt in the soil solution reduces the ability of the plant to take up water, and this leads to reduct...