Synergistic role of microbiologically synthesized nanoparticles and PGPR in sustainable agriculture: a critical review.

In recent years, agriculture has undergone transformative innovations to enhance crop productivity, resilience, and nutritional value. With increasing concerns over food security, environmental degradation, and soil health, there is growing emphasis on sustainable agricultural practices. Among these strategies, the use of plant growth-promoting rhizobacteria (PGPR) have emerged as promising solutions. Advances in nanobiotechnology have led to the development of various metal-based nanoparticles (NPs), such as silver (Ag NPs), zinc oxide (ZnO NPs), titanium dioxide (TiO NPs), carbon nanotubes (CNTs), and quantum dots (QDs). These nanomaterials have the potential to enhance plant biomass and crop yield in both laboratory and field settings. PGPR have gained attention for their ability to improve crop productivity through mechanisms such as nitrogen fixation, phosphate solubilization, siderophore and phytohormone production, and the induction of systemic resistance. The synergistic use of nanotechnology and PGPR represents a revolutionary platform for sustainable agriculture. This integrated approach offers practical solutions to critical agricultural challenges such as low productivity, soil degradation, and environmental sustainability. This review highlights how the combination of synergistic utilization of nanotechnology and PGPR can be developed as a winning strategy for sustainable agriculture to solve the current challenges of food security, soil degradation, and environmental sustainability.