Growth and Physiological Responses of Agropyron cristatum Seedlings Under NaCl and Na_2SO_4 Stress

The seedlings of Agrogyron cristatum were stressed with NaCl and Na2SO4(0,60,120,180,240,300mmol/L) in greenhouse.Six indices including biomass,root-shoot ratio,malondialdehyde(MDA) content,chlorophyll content,proline content and POD activity were determined.As the salt concentration increased,the content of MDA took an increasing trend;the biomass,root-shoot ratio,chlorophyll content and POD activity increased at first and then decreased later.Biomass,root-shoot ratio,chlorophyll content,proline content and POD activity in Agrogyron cristatum seedlings reduced significantly,malondialdehyde(MDA) content increased to the maximum under salt concentration of 300mmol/L.The results showed that low concentration under 120mmol/L of salt stress had some role in promoting growth of Agropyron cristatum,the effect of NaCl stress was greater than Na2SO4 stress.