Biochemical Markers of Plant Salt Tolerance contains the explanary information about salt stress, effects of salt stress on plant development and protective mechanisms against salt stress. Basic principles and antioxidative system elements were discussed to investigate their potential to use as markers in selection of salt tolerant plants. Comparison of the effects of in vitro and in vivo salt stress was studied by using two tobacco plants. The results suggest the importance of glutathione reductase enzyme activity. This book will help scientists and academics to examine, modify and improve their studies.