Effect of Putrescine on Some Biochemical Characteristics of Pot Marigold under Salt Stress Conditions

Salt stress is one of the factors limiting plant growth and development. Putrescine is a compound which can improve the tolerance mechanisms of plants against abiotic stresses. In order to investigate the effects of putrescine on some biochemical characteristics of pot marigold plants under salt stress condition, a factorial experiment was conducted compelitly randomized design with three replications using four levels of soil salinity (the electrical conductivity of 1:1 soil: water extract =1, 3, 6 and 9 dS m-1) and three levels of putrescine solutions including 0, 1 and 2 mMol. Prolin, protein, peroxidase and catalase concentrations in the leaves and malondialdhyde and H2O2 content in both leaves and roots were measured. Results showed that interaction effects of salinity and putrescine were significant on all plant parameters except leaves prolin content and malondealdehyde and H2O2 in root. Application of 1mMol of putrescine at highest level of salinity, decreased malondealdehyde of the leaves 55% compared to control. Application of 2 mMol of putrescine under highest level of salinity decreased leaves H2O2 to 57% while increased protein, catalase and peroxidase content at 132%, 97% and 20% respectively.