Influence of two types of organic matter on interaction of CeO2 nanoparticles with plants in hydroponic culture

► Pumpkin and wheat were exposed to CeO2 nanoparticles in hydroponics at 100 mg L−1. ► Treatments included pure, gum arabic- and fulvic acid-containing nutrient solutions. ► None of the plants exhibited reduced growth or any toxic response. ► CeO2-NPs translocated into pumpkin shoots but not into wheat. ► The presence of organic matter affected the amount of CeO2 associated with roots.