The response of wheat seedlings germinated under salinity stress to exogenous abscisic acid was discussed. Exogenous ABA acid induces two characteristic proteins of high molecu- lar weights ( 109.4 and 84.0 kDa) in addition to the new protein set formed under high salinity levels. ABA, also induces synthesized forms of guaiacot peroxidase in seedlings treated with 200 mM NaCI. The induction and/or accumulation of peroxi- dase isoforms in ABA-treated seedlings, may reduce the active oxygen produced by salinity. The changes in gene expression and peroxidase isoforms may be selected to adaptation of wheat seedlings to NaCl-salinity.