مرکز منطقه ای اطلاع رساني علوم و فناوري - Salicylic Acid and Polyamines in Plant Salt Stress Tolerance

Abstract :

Salinity is one of the major factors that cause crop loss worldwide. It has been estimated that about half of the yield potential of major crops are lost due to salinity. Therefore, crops with tolerance to salinity should be developed to feed the increasing world population. The conventional breeding or modern molecular biology strategies have been employed to maximize plant growth and productivity under salinity stress. However, breeding of crops for salt tolerance is limited due to its own complexities and hereditary difficulties. An alternative approach is to enhance salt tolerance through exogenous application of certain plant growth regulators. Plant growth regulators have proven to increase stress tolerance of plants such as to drought, heavy metals, salinity, low and high temperature stresses. Among these plant growth regulators salicylic acid (SA) and polyamines (PAs) have been studied most extensively. Both SA and PAs play diverse physiological roles, which are affecting plant growth and development under salinity stress. In the present review, we have described the biosynthetic pathways and physiological roles of SA and PAs. Moreover, the effects of exogenous applications of SA and PAs on the plants exposed to salinity stress have also been discussed.