Soybean [Glycine max (L.) Merr.] seedlings were grown in presence of NaF (0-10.0 mM) solution for seven days in laboratory conditions. Seedling length, biomass and some physiological parameters were determined in order to determine the effect of fluoride on the antioxidative efficiency during the early period of seedling growth and to ascertain the mechanism of fluoride toxicity in plants. At lower concentration of fluoride the seedling length and seedling biomass were unaffected but towards higher concentrations, both these parameters decreased in comparison to the control sample. The soluble protein content of the cotyledonary leaf tissue increased but total chlorophyll content decreased with increase in the fluoride in the medium. Superoxide dismutase and catalase activities initially increased and then decreased, but peroxidase activity was almost unaffected. The lipid peroxidation level was found to decrease with increase in fluoride concentration which indicated that oxidative stress was not imposed due to fluoride toxicity and antioxidative efficiency of the tissue was probably maintained by some other mechanisms, not investigated in this study, in presence of fluoride. Thus, on the basis of the results it can be presumed that fluoride has toxic effect on plant during early seedling growth and the mechanism of toxicity might be due to alteration in physiological processes, other than the antioxidative system.
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