| Three polyamines(Put,Spm and Spd) and their different forms(free,perchioric acid soluble and insoluble conjugated) together with polyamine oxidase(PAO) activities and the contents of H2O2 and malondialdehyde(MDA) in peganum harmala seedling leaves were investigated under NaCl stress.The results showed that with NaCl concentration(0,50,100,200 and 400 mmol/L) increased,the total content of the free polyamines and the Put of three different forms of polyamines decreased dramatically,the insoluble conjugated ones decreased little and the soluble ones was significantly unchanged,the contents of free and soluble Spm and Spd were increased first and then decreased,while the insoluble Spm was not changed dramatically but Spd were decreased dramatically.The activities of free and cell wall-bound PAO were increased first and then decreased,and the contents of H2O2 and MDA were increased continuously. |