Histogram showing effect of incresing concentrations of NaCl pertreatment in germinating root tips (72 hrs) of Lathyrus sativus L., on root mitochondrial (dehydrogenase) activity. The Bars with letter within each panel are significantly different at P < 0.0001 according to one way ANOVA (Positive control vs respective treatment groups) followed by Dunnet’s multiple comparison tests within treatment groups.