Book excerpt: Role of Plant Growth Promoting Microorganisms in Sustainable Agriculture and Nanotechnology explores PGPMs (actinomycetes, bacteria, fungi and cyanobacteria) and their multidimensional roles in agriculture, including their increasing applications in sustainable agriculture. In addition to their traditional understanding and applications in agriculture, PGPMs are increasingly known as a source of nano-particles production that are gaining significant interest in their ability to provide more economically, environmentally friendly and safe technologies to crop growers. The book considers new concepts and current developments in plant growth, thus promoting microorganisms research and evaluating its implications for sustainable productivity. Users will find this to be an invaluable resource for researchers in applied microbial biotechnology, soil science, nano-technology of microbial strains, and industry personnel in these areas. - Presents basic and applied aspects of sustainable agriculture, including nano-technology in sustainable agriculture - Identifies molecular tools/omics approaches for enhancing plant growth promoting microorganisms - Discusses plant growth promoting microorganisms in bioactive compounds production, and as a source of nano-particles