PGPB are capable of colonizing plant roots and stimulating plant growth by improving nutrient uptake and producing growth-promoting compounds. They provide plants with essential nutrients, producing plant growth hormones, inducing systemic resistance to diseases and pests, and improving soil structure and fertility. With these qualities possess by these bacteria they contribute to sustainable agriculture thereby limiting the use of chemical fertilizers which causes soil degradation and environmental pollution in general.

Dr Godspower Oke Omokaro thank you for your contribution to the discussion

Plant growth-promoting bacteria (PGPB) are bacteria that can enhance plant growth and protect plants from disease and abiotic stresses through a wide variety of mechanisms; those that establish close associations with plants, such as the endophytes, could be more successful in plant growth promotion. Plant growth-promoting bacteria (PGPB) boost plant development and promote soil bioremediation by secreting a variety of metabolites and hormones, through nitrogen fixation, and by increasing other nutrients' bioavailability through mineral solubilization. PGPR plays an important role in plant growth through direct action mechanisms such as production of phytohormones, increased iron uptake via iron-chelating siderophores, solubilization of inorganic phosphates, and production of volatile compounds that affect plant signaling pathways and metabolism. Microorganisms have the potential to improve plant growth under abiotic stress conditions by promoting the production of low-molecular-weight osmolytes, such as glycinebetaine, proline, and other amino acids, mineral phosphate solubilization, nitrogen fixation, organic acids, and producing key enzymes. Plant growth regulators (PGRs) are chemicals used to modify plant growth such as increasing branching, suppressing shoot growth, increasing return bloom, removing excess fruit, or altering fruit maturity. Bacteria known as Plant Growth-Promoting Rhizobacteria (PGPR) are diverse and represent a wide range of phyla. They also perform a wide variety of growth-promoting functions. One of the most extensively studied groups of PGPRs is that of the various Azospirillum species.PGPMs are competent agents to improve soil nutrient recycling through removal or degradation of contaminants like organic and inorganic agents and excellent biosorbents for metallic contaminants. Many soil bacteria process nitrogen in organic substrates, but only nitrogen fixing bacteria can process the nitrogen in the atmosphere into a form that plants can use. Nitrogen fixation occurs because these specific bacteria produce the nitrogenase enzyme. Microbes are responsible for both production and destruction of foodstuffs and are a key element in reducing waste from spoilage. Some microorganisms can degrade plastics, toxins, and agricultural waste, but some convert excess fertilizer to nitrous oxide, a potent greenhouse gas.