Physiological characteristic changes during the process of seed germination and seedling growth of Kostelezkya virginica under the NaCl stress

Using 1/4 Hoagland as the basic culture solution,the status of seed germination and seedling growth of Kostelezkya virginica(L.) Presl.under 0.5%-2.5% NaCl stress was researched.With the increasing of NaCl concentration,the seed germination rate decreased gradually.The seeds treated by 2.5% NaCl did not germinated,but seeds still germinated and got similar germination rate as CK when NaCl stress was canceled.The seedlings growing in 0.5%-1.0%NaCl culture solution were much better than that in higher salt concentration,and had higher chlorophyll content and root system activity than CK,but got bad and chlorophyll content was reduced when seedlings cultured in 1.5%-2.0% NaCl solution.The MDA content of seedling was decreased under NaCl stress.In addition,the adaptation mechanism of K.virginica to NaCl stress was discussed.