Beneficial Bacteria for Agriculture – PGPR

PGPR (plant growth-promoting rhizobacteria) are bacteria that inhabit the rhizosphere and colonize plant roots, positively influencing plant development. The PGPR classification includes all bacteria that can enhance plant growth. The following genera of bacteria are considered PGPR: Agrobacterium, Arthrobacter, Azoarcus, Azospirillum, Azotobacter, Bacillus, Burkholderia, Caulobacterium, Enterobacter, Erwinia, Flavobacterium, Klebsiella, Micrococcus, Pantoea, Pseudomonas and Piscaya.

These microorganisms can achieve this through various direct and indirect means. For example, they synthesize metabolites for the plants or increase the availability of different nutrients required for plant metabolism. An indirect method would be protecting the plant against diseases, such as by inhibiting the growth of fungi.