Maintenance of tissue water status helps the plants to avoid the dehydration and protects the carboxylation and other enzymes from inactivation and denaturati on (Anjum et al., 2012). By con-trast, a strong decrease in the photosynthetic rate in 5/cultivar,8/cultivar plants, and ungrafted plants, along with a decrease inRWC (a weak osmotic adjustment), and a decrease in Fv/Fo was observed under water stress.