To evaluate the role of N assimilation in mechanisms of salt tolerance, NR activity and N content were studied. It was observed that both N content and NR activity decreased under salt stress. In the absence of salt stress, supplementation of 10 mM N increased NR activity and N content by 28% and 94%, whereas 20 mM N decreased the NR activity and N content by 17% and 21%, respectively com-pared to control. However, treatment with 20 mM N when given with the salt stress increased NR activity by 21% and N content by 62% compared to control (Fig. 5).