Pakistan Journal of Biological Sciences1028-88801812-5735Asian Network for Scientific Information10.3923/pjbs.2007.2086.2090Zea mays L. Seedlings]]>TajdoostS. FarboodniaT. HeidariR. 1220071012Recent molecular studies show that genetic factors of salt tolerance in halophytes exist in glycophytes too, but they are not active. If these plants expose to low level salt stress these factors may become active and cause plants acclimation to higher salt stresses. So because of the importance of these findings in this research the effect of salt pretreatment has been examined in Zea mays seedlings. To do the experiment four day old Zea mays seedlings (Var. single cross 704) pretreated with 50 mM NaCl for the period of 20 h. Then they were transferred to 200 and 300 mM NaCl for 48 h. At the end of treatment roots and shoots of seedlings were harvested separately. The changes of K+- leakage, the amount of malondialdehyde, proline, soluble sugars and the Hill reaction rate were analyzed. The results indicated that the amount of K+- leakage and malondialdehyde (MDA) have been increased because of salt-induced lipid peroxidation and membrane unstability. Soluble sugars and proline as osmoregulators has been increased in stress condition and in pretreated plants with NaCl were the highest. The rate of Hill reaction was reduced significantly in stressed plants. Therefore we concluded that salt stress causes serious physiological and biochemical damages in plants and salt pretreatment enhances tolerance mechanisms of plants and help them to tolerate salt stress and grow on salty environments.]]>Allakhverdiev, S.I., A. Sakamoto, Y. Nishiyama, M. Inaba and N. Murata,2000Synechococcus sp.]]>12310471056Arshi, A., M.Z. Abdin and M. Iqbal,20052 on growth, ionic relations and proline content of Senna under salinity stress.]]>28101125Ashraf, M. and P.J.C. Harris,2004166316Bates, L.S., R.P. Waldren and I.D. Teare,197339205207Chen, Z., I. Newman, M. Zhou, N. Mendham, G. Zhang and S. Shabala,2005+ flux: A case study for barley.]]>2812301264Choudhury, N.K. and U.C. Biswal,1980494348Dubois, M., K.A. Gilles, J.K. Hamilton, P.A. Rebers and F. Smith,195628350356Gill, P.K., A.D. Sharma, P. Singh and S.S. Bhullar,2002Sorghum bicolor (L.) moench seeds.]]>281225Gruwel, M.L.H., V.L. Rauw, M. Loewin and S.R. Abrams,200113p and 23Na NMR system to study salt tolerance.]]>160785794Heath, R.L. and L. Packer,1968125189198Hernandez, J.A. and M.S. Almansa,2002115251257Hong, Z., K. Lakkineni, Z. Zhang and D.P.S. Verma,20001-pyrroline-5-carboxylate synthetase results in increased proline accumulation and protection of plants from osmotic stress.]]>12211291136Krieger-Liszkay, A.,200556337346Kronzucker, H.J., M.W. Szczerba and D.T. Britto,200342K-tracer analysis in Hordeum vulgar L. reveals set-point variations in [K+].]]>217540546Naeini, M.R., A.H. khoshgoftarmanesh, H. Lessani, E. Fallahi,20042713191326Parida, A.K. and A.B. Das,200560324349Shalata, A., V. Mittova, M. Volokita, M. Guy and M. Tal,2001Lycopersicon pennellii to salt-dependent oxidative stress: The root antioxidative system.]]>112487494Stewart, C.K. and J.A. Lee,1974120279289Zhu, J.K.,2000Arabidopsis.]]>124941948