Plant Growth Promotion Using .

Plant growth-promoting bacteria (PGPB) appear to be a sensible competitor to conventional fertilization, including mineral fertilizers and chemical plant protection products. Undoubtedly, one of the most interesting bacteria exhibiting plant-stimulating traits is, more widely known as a pathogen, . To date, several environmentally safe strains of have been isolated and described, including WSE01, MEN8, YL6, SA1, ALT1, ERBP, GGBSTD1, AK1, AR156, C1L, and T4S. These strains have been studied under growth chamber, greenhouse, and field conditions and have shown many significant traits, including indole-3-acetic acid (IAA) and aminocyclopropane-1-carboxylic acid (ACC) deaminase production or phosphate solubilization, which allows direct plant growth promotion. It includes an increase in biometrics traits, chemical element content (e.g., N, P, and K), and biologically active substances content or activity, e.g., antioxidant enzymes and total soluble sugar. Hence, has supported the growth of plant species such as soybean, maize, rice, and wheat. Importantly, some strains can also promote plant growth under abiotic stresses, including drought, salinity, and heavy metal pollution. In addition, strains produced extracellular enzymes and antibiotic lipopeptides or triggered induced systemic resistance, which allows indirect stimulation of plant growth. As far as biocontrol is concerned, these PGPB can suppress the development of agriculturally important phytopathogens, including bacterial phytopathogens (e.g., , , and ), fungal phytopathogens (e.g., , , and ), and other phytopathogenic organisms (e.g., (Nematoda) and (Protozoa)). In conclusion, it should be noted that there are still few studies on the effectiveness of under field conditions, particularly, there is a lack of comprehensive analyses comparing the PGP effects of and mineral fertilizers, which should be reduced in favor of decreasing the use of mineral fertilizers. It is also worth mentioning that there are still very few studies on the impact of on the indigenous microbiota and its persistence after application to soil. Further studies would help to understand the interactions between and indigenous microbiota, subsequently contributing to increasing its effectiveness in promoting plant growth.