The mechanics about anti-injury in Aloe nobilis seedlings against saline-alkali stress were investigated in present research.When A.nobilis seedlings were suffered from Na2CO3 stress in different concentrations for 7 d,the activities of superoxide dismutase(SOD),catalase(CAT),ascorbate peroxidase(APX),glutathione transferase(GST),the contents of chlorophyll,malonaldehyde(MDA) and osmotica in leaves of A.nobilis seedlings,the electrolyte leakage rate were determined.When the osmotica potential in media was c...