Influences of AM Fungi on Growth and Root Antioxidative Enzymes of Trifoliate Orange Seedlings under Salt Stress

An experiment was conducted to study the influences of AM fungi,Glomus mosseae and G.versiforme,on growth and root antioxidative enzymes of trifoliate orange (Poncirus trifoliata L.Raf) .seedlings under NaCl stress.The results showed that salt stress reduced shoot fresh weight and root fresh weight of trifoliate orange,whereas the inoculation with AM fungi enhanced the shoot fresh weight and the root fresh weight.Salt stress also reduced the soluble protein content in the roots of trifoliate orange,but increased the activities of antioxidative enzymes including SOD and CAT.Inoculated seedlings presented higher soluble protein content and activities of SOD and CAT in roots than non-inoculated seedlings under salt stress and nonsaline stress conditions.G.mosseae exhibited higher efficiency to enhance salt tolerance of trifoliate orange than G.versiforme.