Azospirillum, a PGPRs species, is thought to secrete plant growth hormones like gibberellins, ethylene, and auxins . Phytohormone production can also be induced by some plant-associated microorganisms. At varied cultural pH, temperature, and in the presence of agro-waste as a carrier material, Rhizobium and Bacillus were discovered to synthesis IAA. Ethylene, unlike other phytohormones, is responsible for dicot plant growth suppression. PGPR could enhance the growth of plant by suppressing the expression of ethylene.
What is the mechanism of action of biofertilizers?
