At lower ambient fluoride (F) concentrations, a   number of   physiological and biochemical changesmay be initiatedin plant without the appearance of visible fluoridesymptoms. The three tree species of semi arid region viz. Acacia tortilis, Cassia fistula and Prosopis juliflora grow very well in F contaminated areas. To detect changes in photosynthesis due to F stress, the chlorophyll content (chlorophyll a, chlorophyll b and chlorophyll a/b ratio) and chlorophyll fluorescence measurements were carried out in these plants. One month old plants were treated with 10, 20 and 50 mg kg^-1 F for 10 days. Visible injury in the form of chlorosis was observed only in leaves of C. fistula. C. fistula seemed to be more sensitive to F stress, as maximum decrease in chlorophyll content was observed in this plant. Short term exposure to F did not bring any major change in   photosynthetic performance of these plants. This was revealed by ETR, ETRmax, PPFD-sat and ΔF/Fm’-sat values which were higher in these plants. Thus, the F treatment did not cause any deleterious effects on chlorophyll content and photosynthetic performance in these plants during early growth stages. The lesser inhibition in the parameters suggest the F tolerant nature of these tree species, indicating their potential use for treatment of F contaminated soil and water.

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