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Genetics and Molecular Biology

Print version ISSN 1415-4757On-line version ISSN 1678-4685

Abstract

SOUZA, Rocheli de; AMBROSINI, Adriana  and  PASSAGLIA, Luciane M.P.. Plant growth-promoting bacteria as inoculants in agricultural soils. Genet. Mol. Biol. [online]. 2015, vol.38, n.4, pp.401-419.  Epub Nov 03, 2015. ISSN 1678-4685.  https://doi.org/10.1590/S1415-475738420150053.

Plant-microbe interactions in the rhizosphere are the determinants of plant health, productivity and soil fertility. Plant growth-promoting bacteria (PGPB) are bacteria that can enhance plant growth and protect plants from disease and abiotic stresses through a wide variety of mechanisms; those that establish close associations with plants, such as the endophytes, could be more successful in plant growth promotion. Several important bacterial characteristics, such as biological nitrogen fixation, phosphate solubilization, ACC deaminase activity, and production of siderophores and phytohormones, can be assessed as plant growth promotion (PGP) traits. Bacterial inoculants can contribute to increase agronomic efficiency by reducing production costs and environmental pollution, once the use of chemical fertilizers can be reduced or eliminated if the inoculants are efficient. For bacterial inoculants to obtain success in improving plant growth and productivity, several processes involved can influence the efficiency of inoculation, as for example the exudation by plant roots, the bacterial colonization in the roots, and soil health. This review presents an overview of the importance of soil-plant-microbe interactions to the development of efficient inoculants, once PGPB are extensively studied microorganisms, representing a very diverse group of easily accessible beneficial bacteria.

Keywords : nitrogen fixation; siderophore production; plant-bacteria interaction; inoculant; rhizosphere.

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