Growth promotion of beneficial bacteria

The term "growth promotion of beneficial bacteria", often referring to plant growth-promoting rhizobacteria (PGPR) or plant growth-promoting microbes (PGPM), encompasses diverse soil-dwelling bacterial species that enhance plant health through multiple mechanisms. These include improving nutrient availability in the soil; producing phytohormones like auxin, gibberellin, and cytokinin; increasing tolerance against abiotic stresses such as drought or salinity; forming protective biofilms on roots via exopolysaccharide secretion; suppressing pathogens through antimicrobial metabolites like lipopeptides; and priming the plant immune system through induced systemic resistance pathways involving jasmonic acid and ethylene signaling. While these functions make PGPR/PGPM valuable tools in sustainable agriculture—boosting crop yield while reducing chemical inputs—the term does not refer to any single molecular target, but rather describes collective microbial activities that benefit plants at both physiological and ecological levels.

Other names

Plant growth-promoting rhizobacteria (PGPR)Beneficial microbesPlant growth-promoting microbes (PGPM)

Production and secretion of phytohormones such as auxins, gibberellins, cytokinins; Synthesis of antimicrobial compounds including lipopeptides for pathogen suppression; Formation of exopolysaccharides for biofilm creation and root protection; Modulation of plant immune responses via induced systemic resistance pathways involving jasmonic acid and ethylene signaling