Puccinellia tenuiflora is widely found in saline marshes in north of China,and used for forage as well as soil improvement.Lots of studies were carried on its salt tolerance mechanism.However,the precise mechanisms for the salt tolerance of P.tenuiflora remain elusive.In our new study of P.tenuiflora,we measured unidirectional ~(22)Na~+ influx and efflux, to assess the contributions of unidirectional Na~+ fluxes on net accumulation in comparison with wheat(Triticum aestivum,another member of the Pooi...