Abstract: Growing plants that can resist salt and tolerate the seawater is one of valid steps in rightful use and exploiture of coastal soil.Pot experiments were carried out to study the effects of treatments with different concentrations of seawater on growths,distributions of ions,and different absorption of ³²P of Helianthus tuberosus seedlings.The results were as follows:Compared with the control,there were slight changes of the fresh weight (FW) and the dry weight (DW) of roots and the shoots of Helianthus tuberosus seedlings treated with 25% and 50% seawater,while they significantly declined treated with 75% seawater.But the percentage of DW was highest under 75% seawater stress than others treatments.The absorption ratio of ³²P was highest for the seedlings treated with 25% seawater under the moderate level of P.The contents of Na⁺ and Cl^- in the shoots added with the enhancements of seawater concentrations.Compared with Na⁺,the K⁺ content was highest under 25% seawater stress,then 50%,control and 75% in turn.And the contents tendencies of Na⁺,Cl^-and K⁺ of the unitage dry weight in roots were similar with them in the shoots.

Key words: seawater stresses, Helianthus tuberosus, ³²P, ion absorption and distribution