Abstract
Several processes mediated by soil microorganisms play an important role in nutrient cycling. One such process is biological nitrogen fixation (BNF) by representatives of various bacterial phylogenetic groups, which are called diazotrophs. Most studies of the Azospirillum-plant association have been conducted on cereals and grasses. Currently, 17 species of Azospirillum have been described. However, a great diversity of these bacteria continues to be revealed, and little is known of the potential applications of the many species that have been described. The Azospirillum-plant association begins with the adsorption and adherence process of these bacteria in roots. Involved in these processes is the recognition of bacterial polysaccharides by the host plant, a step that is necessary in successfully forming a positive relationship between roots and Azospirillum. The presence of Azospirillum in the rhizosphere can minimize the susceptibility to diseases caused by plant pathogens. Furthermore, the ability to produce phytohormones, mainly auxins (indole-3-acetic acid) and other molecules from secondary metabolism has been suggested to underlie the growth response to inoculation by Azospirillum species. These positive aspects of Azospirillum colonization in the roots are also responsible for the alleviation of plant stress. For all of the above-mentioned reasons, Azospirillum are also widely used as commercial inoculants, resulting in a significant economic impact in crop yields in many countries. In fact, solid and liquid formulations containing Azospirillum are marketed in various countries, such as Brazil, Argentina, Mexico, Italy, France, Belgium, Africa, Germany, Pakistan, Uruguay, India and the USA. In addition, new formulations containing Azospirillum, such as polymeric inoculants (alginate, agar, chitosan and gum), are already used for the improvement of many crops. This chapter summarizes the positive effects of Azospirillum-plant interactions and their biological importance for the improvement of agriculture worldwide.
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Rodrigues, A.C., Bonifacio, A., de Araujo, F.F., Junior, M.A.L., do Vale Barreto Figueiredo, M. (2015). Azospirillum sp. as a Challenge for Agriculture. In: Maheshwari, D. (eds) Bacterial Metabolites in Sustainable Agroecosystem. Sustainable Development and Biodiversity, vol 12. Springer, Cham. https://doi.org/10.1007/978-3-319-24654-3_2
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