(1) 鲁东大学生命科学学院

The effects of root abscisic acid(ABA)signal on Na~+ transport and photosystem Ⅱ(PSⅡ)in Jerusalem artichoke(Helianthus tuberosus)under salt stress(150 mmol·L~(-1)NaCl)were examined by applying ABA synthesis inhibitor sodium tungstate to roots. Sodium tungstate inhibited ABA synthesis in roots,reduced root Na~+ efflux,and increased the efficiency of Na~+ transport from roots to leaves under salt stress. Salt stress increased leaf Na~+ content and did not affect leaf membrane lipid peroxidation,PSⅡ reaction center protein and PSⅡ maximum photochemical efficiency(Fv /Fm). The inhibition on root ABA synthesis significantly increased leaf Na~+ accumulation, aggravated leaf membrane lipid peroxidation,impaired PS Ⅱ reaction center protein, decreased Fv /Fm,and induced PSⅡ photoinhibition. In conclusion,root ABA signal was beneficial to reducing leaf Na~+ accumulation and preventing PSⅡ oxidative damage by inducing root Na~+ efflux and inhibiting Na~+ transport to the aerial part in H. tuberosus under salt stress.