Physiological responses of weat seedling to water and salt stress

Wheat seedlings were used to study the changes of relative electrical transmission rates of callus,Fv/Fm and contents of MDA,free proline,soluble sugar,chlorophyll under salt and water stress,in order to analyze the difference of leaves responses to water and salt stress.The results showed that relative electrical transmission rates of callus and contents of MDA increased under salt and water stress compared with control,when plants were under salt stress,the permeability of cytoplasm membrance and membrance lipid peroxidation increased compared with water stress,that maybe the effects of iron toxcity;Contents of free proline and soluble sugar increased under salt and water stress compared with control,but contents of soluble sugar was higher and contents of free proline was lower under salt stress than under water stress,that means soluble sugar was the main osmotic regulation under salt stress and free proline was the main osmotic regulator under water stress;Fv/Fm and contents of chlorophyll decreased under water and salt stress compared with control,and those were much more decreased under salt stress,that may also be co-effects of ion toxicity and cell dehydration.