Schematic illustration of important mechanisms known for plant growth promotion by
PGPR. Different mechanisms can be broadly studied under (1) Biofertilization, and (2) Biocontrol
of pathogens. Biofertilization encompasses: (a) N2 Fixation, (b) Siderophore production,
(c) Pinorganic solubilization by rhizobacteria. Biocontrol involves: (a) Antibiosis, (b) Secretion of
lytic enzymes, and (c) Induction of Systemic Resistance (ISR) of host plant by PGPR