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Adaptive biochemical and physiological responses of Eriobotrya japonica to fluoride air pollution

Elloumi, Nada, Zouari, Mohamed, Mezghani, Imed, Ben Abdallah, Ferjani, Woodward, Steve, Kallel, Monem
Ecotoxicology 2017 v.26 no.7 pp. 991-1001
Eriobotrya japonica, adverse effects, air pollution, antioxidant activity, catalase, fluorides, glutathione peroxidase, hydrogen peroxide, leaves, lipid peroxidation, loquats, oxidative stress, phosphorus fertilizers, photosynthesis, physiological response, pigments, proline, roots, stomatal conductance, superoxide dismutase, trees, Tunisia
The biochemical and physiological effects of fluoride were investigated in loquat trees (Eriobotrya japonica) grown in the vicinity of a phosphate fertilizer plant in Tunisia. Photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (E), superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GPx) activities were assessed; along with photosynthetic pigments, lipid peroxidation, electrolytic leakage (EL) and total phenolic contents in foliage and roots of trees at different distances from the phosphate fertilizer plant. All assessed parameters showed significant discrepancies in comparison with unpolluted sites. Obtained results showed high oxidative stress indices including H₂O₂, lipid peroxidation, and EL, SOD, CAT and GPx activities and proline contents in leaves and roots at the polluted sites as compared to control. In contrast, leaf Pn, Gs, E and photosynthetic pigment contents were low as compared to the control. These results indicate that even though antioxidant responses increased near the factory, adverse effects on physiology were pronounced.