Germination was increasingly inhibited at concentrations above 5 and 20 mM and stopped altogether at 80 and 50 mM NaF in rice and jute respectively, whereas the inhibition of seedling growth began at much lower concentrations. Of the enzymes, RNase activity was increased by fluoride, while α-amylase, protease, phytase and ATPase activities exhibited distinct inhibition from the control. © 1982 Academia.