Abstract
Seven-day old seedlings were exposed to incremental NaCl stress in order to determine the toxicity levels of Na + and tI- in leaf cell sap of two wheat varieties, viz.Pb-85 (sensitive) and LV-26S (tolerant). Concentration of Na + /CI- in leaf cell sap giving 50% reduction in fresh weight of shoot/root was tentatively taken as toxic level of the respective ion. Accordingly, the toxic levels of Na + in both the varieties were around 250 m mol kg-I, whereas the corresponding value for CI-was about 300 m mol kg-I indicating that Na + was probably more toxic than CI- in wheat. Toxicity level when based on fresh weight gave comparatively more realistic values than expressing it on dry weight basis.
