“…Its concentration in sensitive plants ranges between 0.001 and 0.010 g kg −1 , 28 whereas resistant plants such as tea plant can tolerate several thousands of milligrams of fluoride per kilogram 29 . Studies have shown that fluoride is mainly absorbed by roots from soil solution, 30 small amounts can enter leaves via the cuticle or stomata when it is present in the air, typically in gaseous forms of hydrogen fluoride (HF) or silicon tetrafluoride (SiF 4 ) 18,28,31 . Fluoride uptake by tea plant roots is usually positively and energy‐dependent, even linearly, correlated with exogenous fluoride and followed Michaelis–Menten kinetics, 30,32 which can be regulated by Ca 2+ ‐ATPase and H + ‐ATPase, 33,34 but is a passive process for solutions containing high fluoride levels 30,32,35 .…”