Effects of Soil Salt Stress on the Activity of Protective Enzymes and Peroxidation in Three Warm-season Turfgrasses

Activity of protective enzymes and peroxidation in three warm-season turfgrasses under soil salt stress were studied. The results showed:the activities of several protective enzymes(SOD, CAT, POD and APX) of Centipedegrass under 0.6%NFA480.8% salt stress declined gradually with the stress prolonged, while the activities of protective enzymes increased in 0.2%NFA480.4% salt stress of Centipedegrass and all the treatments of Zoysiagrass and Manilagrass. MDA and RPP increased actually with the stress enhanced and prolonged, The increasing speed in Centipedegrass was the highest and in Manilagrass was the lowest. Activity of PAL increased with salt concentration increased in three turfgrasses, but under 0.8% salt stress, it increased in early phase of stress and decreased with the stress prolonged in Centipedegrass. The activity of protective enzymes and contents of MDA and RPP were related to the salt tolerance.It was considered that salt tolerance of Manilagrass was the highest and that of Centipedegrass the lowest.