Co-application of selenium nanoparticles and Aloe vera gel alleviates chromium toxicity in spinach by modulating antioxidative defense mechanisms. - Sajjad S; Khan A; Mushtaq A; MacDonald MT; Hamza M; Rasheed S; Zaman QU; Alwahibi MS; Alnamer S; Hussain A (Frontiers in plant science, 2026)