The effect of doubled CO_2/salt stress on the organic dry weight,contents of K~+ Na~+ Ca Mg,proling level and the changes of content and composition of protein were investigated in two wheat varieties with different salt tolerance.The organic dry weight and K~+、Ca、Mgcontents in two wheat seedlings grown in 150mmol/L NaCl decreased comparing with the controls while Na~+ level increased.Under doubled CO_2,the organic dry weigt and K~+、Na~+levels rose,but Ca、Mg levels fell.Moreover,doubled CO_2 co...