Abstract
Plant growth-promoting rhizobacteria (PGPR), often found in soil rhizosphere and capable of colonising plant roots, are a diverse group of free-living bacteria that are advantageous to plant development. The rhizosphere, a crucial component of soil ecology and plant health for interactions between plants and microbes, is connected to PGPR. Associative nitrogen fixers like Azospirillum, Enterobacter, Klebsiella, and Pseudomonas, as well as symbiotic nitrogen-fixing bacteria like Rhizobium, Bradyrhizobium, Azorhizobium, Allorhizobium, Sinorhizobium, and Mesorhizobium, have been demonstrated to attach to roots and effectively colonise root surfaces. The PGPR might support the promotion of sustainable plant development. Due to increased pesticide and fertiliser inputs, these microorganisms' importance in traditional agriculture is diminished, which results in the loss of biodiversity and its purpose. A shift from conventional intensive agriculture to sustainable agriculture is being brought about by greater awareness in many nations, including India. Sustainable agriculture refers to farming practises that limit the use of chemical pesticides and mineral fertilisers. This chapter has covered the function of PGPR in the process of promoting plant development, their methods, and significance of PGPR in crop production on a sustainable basis.
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