Plant growth promoting rhizobacteria are the soil bacteria inhabiting around/on the root
surface and are directly or indirectly involved in promoting plant growth and development via production
and secretion of various regulatory chemicals in the vicinity of rhizosphere. Generally,
plant growth promoting rhizobacteria facilitate the plant growth directly by either assisting in
resource acquisition (nitrogen, phosphorus and essential minerals) or modulating plant hormone
levels, or indirectly by decreasing the inhibitory effects of various pathogens on plant growth
and development in the forms of biocontrol agents. Various studies have documented the increased
health and productivity of different plant species by the application of plant growth promoting rhizobacteria
under both normal and stressed conditions. The plant-beneficial rhizobacteria may
decrease the global dependence on hazardous agricultural chemicals which destabilize the agro-ecosystems.
This review accentuates the perception of the rhizosphere and plant growth promoting rhizobacteria
under the current perspectives. Further, explicit outlooks on the different mechanisms of
rhizobacteria mediated plant growth promotion have been described in detail with the recent development
and research. Finally, the latest paradigms of applicability of these beneficial rhizobacteria
in different agro-ecosystems have been presented comprehensively under both normal and stress
conditions to highlight the recent trends with the aim to develop future insights.