First time to report the effects of CeO2 NPs on Bt-transgenic plant.
CeO2 NPs had toxic effects on root biomass of Bt-transgenic cotton.
Nutrient of Bt-transgenic plant were more likely to be affected by CeO2 NPs than CK.
Bt-transgenic plant adsorbed more CeO2 NPs and transported fewer NPs than CK.