Salt stress affects every aspect of physiology in crops, as a result virtually reduces their productivity. One of strategies for agriculture is to improve the salt tolerance of crops. As adaptive response, plants can effectively adjust their physiology and metabolism to reduce stress injury. Polyamines, mainly Put, Spd and Spm, response not only to adverse conditions but signal transduction in higher plants. However, the mechanism is still not well established in the relationships between polyamine forms (f...