Fluoride as a strong oxidant can directly induce generation of reactive oxygen species (ROS) and oxidative stress in both, plants and animals. Fluoride could inhibit or activate enzymes which protect organism against imbalance between ROS and antioxidants.

This study was conducted to determine the effect of sodium fluoride in Hoagland’s hydroponic culture medium at level of 190 mg F/L on the catalase  (CAT) and guaiacol peroxidase (POX) activity in 14-day seedlings of nine plan species: bean (Phaselous vulgaris), pea (Pisum sativum), broad bean (Vicia faba), agrimony (Agrimonia eupatoria), white mustard (Sinapsis alba), wheat (Triticum aestivum), oat (Avena sativa), millet (Panicum miliaceum) and corn (Zea mays). For each plant species a control experiment without NaF treatment was conducted Enzyme activities was measured spectrophotometrically by a spectrophotometer UV-1800 Shimadzu.

Catalase activity increased significantly in bean, pea, agrimony, oat and millet and decreased in corn and broad bean tissues compared to control plants. Activity of peroxidase was significantly higher in treated plant tissues than in control plants in the case of wheat, oat and agrimony while in broad bean, millet and white mustard the activity of POX decreased. The highest stimulation of peroxidase activity was reported in pea (520% of POX activity in control plants) while CAT in oat and agrimony (120%).

This research has showed that fluoride probably cause ROS generation and could be an inhibitor or stimulator of antioxidant enzymes activity.

Research project funded by National Science Center, No. N N305 385138.

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1. Fluoride content and antioxidant activity of infusions of selected herbs from Lamiaceae family 
2. An attempt to determination of the 50% phytotoxicity threshold for different fluoride concentrations affecting the spring wheat (Triticum aestivum L.) and white mustard (Sinapis alba L.) seedlings