Useful bacteria for agriculture – PGPR
PGPR (Plant Growth-Promoting Rhizobacteria) are bacteria that inhabit the rhizosphere and colonize plant roots influencing positively the development of plants. The classification PGPR takes into account all bacteria that are able to improve the growth of plants. The following bacteria genera are considered to be PGPR: Agrobacterium, Arthrobacter, Azoarcus, Azospirillum, Azotobacter, Bacillus, Burkholderia, Caulobacter, Chromobacterium, Enterobacter, Erwinia, Flavobacterium, Klebsiella, Micrococcous, Pantoea, Pseudomonas, Rhizobium y Serratia.
These microorganisms are able to do this by diverse direct and indirect means. For example, by synthesizing metabolites for the plants, or increasing the availability of different nutritive elements required for their metabolism. An indirect way would be by protecting the plant against diseases: for example, inhibiting fungal growth.