Synthesis of Iron Oxide Nanoparticles and Their Role in Regulation of In Vitro Plant Organogenic Development

Iron oxide nanoparticles (IONPs) have emerged as pivotal nanomaterials in plant biotechnology, particularly for enhancing in vitro plant tissue culture systems. This chapter provides a comprehensive overview of the synthesis strategies and functional roles of IONPs in regulating in vitro plant organogenic development. It discusses various physicochemical and green synthesis approaches, emphasizing the advantages of eco-friendly, plant extract-based methods for producing biocompatible and bioactive nanoparticles. Key physicochemical properties of IONPs, including size, surface charge, and morphology, are examined in relation to their influence on plant cellular processes. The chapter delves into the mechanistic insights behind IONPs’ action—highlighting their capacity to improve iron nutrition, modulate phytohormonal pathways, trigger reactive oxygen species (ROS) signaling, and activate antioxidant defense systems—leading to enhanced callus formation and organ regeneration. Case studies in model and crop species (e.g., chickpea, rice, Stevia) are analyzed to illustrate the biological outcomes and application potential. Biosafety concerns, dose-dependent toxicity, and the need for standardization across species are critically discussed. The chapter concludes by highlighting future directions, including the integration of IONPs with precision genetic transformation, and the development of nano-enabled plant regeneration platforms. This work positions IONPs as powerful tools for optimizing plant tissue culture techniques and advancing nanobiotechnology in sustainable agriculture.