RT Journal Article SR Electronic A1 Gupta, Aayushi A1 Bharati, Rohit A1 Kubes, Jan A1 Vachova, Pavla A1 Popelkova, Daniela A1 Mahawar, Lovely A1 Zivcak, Marek A1 Yang, Xinghong A1 Brestic, Marian A1 Skalicky, Milan T1 Ferric oxide nano-priming enhances photosynthetic and physicochemical properties of sunflower (Helianthus annuus L.) microgreens JF Plant, Soil and Environment YR 2024 VO 70 IS 11 SP 702 OP 711 DO 10.17221/272/2024-PSE UL https://pse.agriculturejournals.cz/artkey/pse-202411-0003.php AB In modern agriculture, nano-priming represents an innovative approach, harnessing the power of nanotechnology to enhance crop yields and nutrition. However, to effectively harness the potential of nanoparticles (NPs) for agriculture applications, understanding their mode of action and optimal application rates for positive effects on microgreen growth and physiology is critical. In this interdisciplinary study, we investigated the priming of sunflower seeds with a range of concentrations (25, 50, and 100 mg/L) of ferric oxide (Fe<sub>2</sub>O<sub>3</sub>) nanoparticles (FeNPs) and compared them with control samples. Our findings revealed a significant increase in plant biomass, leaf size, and photosynthetic activity in treated samples. The activities of photosystems I and II increased with higher FeNPs concentration. The treated samples exhibited elevated levels of total phenolics, anthocyanin, and antioxidant enzyme activity, along with increased macronutrients and micronutrients. These findings highlight the potential of FeNPs as a promising tool for enhancing plant growth and physiology in sunflower microgreens.