Effects of Salt Stress on Water Content and Photosynthetic Characteristics in Iris lactea Var. Chinensis Seedlings

Abstract

2 Abstract: Water content and photosynthetic characteristics of the seedlings of Iris lactea var. chinensis under the salt stress were studied in this article. The results showed that water content reduced and water deficit increased in roots and leaves of seedlings under NaCl stress. Besides, stomatal conductance and stomatal limitation changed little after the first reduction, the intercellular CO concentration increased before the little 2 change and net photosynthetic rate and transpiration rate dropped directly. Furthermore, water potential and osmotic potential reduced with the increase of salt concentration, but the pressure potential had retained a positive trend and cell turgor had been maintained, which meant that osmoregulation had an important role in the seedlings of Iris lactea var. chinensis against the salt stress. The study provided a scientific basis for the improvement of saline-alkali soil and urban landscape.