Influences of salt and alkali mixed stresses on antioxidative activity and MDA content of Medicago sativa at seedling stage

The Medicago sativa cv.Gongnong No.1 were stressed by different concentrations salt-alkali(NaCl/Na2CO3) at seedling stage.Activities of SOD,POD,CAT and MDA of M.sativa leaf were determined at seedling stage.Activities of SOD,POD,CAT and MDA were increased with increasing salt concentrations,and higher than CK.