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Universidade de Sao Paulo (2016)

Native of Caatinga rhizobacteria with potential for reducing the adverse effects of drought in soybean (Glycine max L.)

Braga, Ana Paula Andrade

Titre : Rizobactérias nativas da Caatinga com potencial para redução dos efeitos da seca em soja (Glycine max L.)

Auteur : Braga, Ana Paula Andrade

Université de soutenance : Universidade de São Paulo (USP) Escola Superior de Agricultura Luiz de Queiroz

Grade : Maîtrise Microbiologie Agricole 2016

Résumé
In the Brazilian semi-arid region, the predominat vegetation is the Caatinga biome, still little explored, which features plants and micro-organisms with high resistance to drought periods imposed by the climate. Microorganisms associated with plants in this biome are able to develop mechanisms of cellular protection agains water stress, as well as vegetable protection agains desiccation. The presente study souught tounderstand the rhizobacteria associated with Mimosa artemisiana in order to select drought-tolerant bactéria with characteristics to promote the growth of plants under water stress conditions, thus reducing adverse effects imposed by drought. Rhizospheric soil samples were collectes along the Caatinga, encompassing the States of Bahia and Pernambuco, totaling four collection points. With the use of farming-dependet methodologies, was isolated bactéria with some features of promotion of growth of direct and/or indirect plants such as AIA production and nitrogen fixation. In addition, able to grow amid strains with reduced water activity and mechanisms of protection against desiccation, such as production of EPS, biofilm, production of ACC deaminase and induction of systemic resistance through peroxidase enzymes and polifenoloxidase. A strain of Paenibacillus sp. and Bacillus sp. were able to promote soybean gowth under water stress conditions, increasing some parameters like vegetables, shoot and root system

Mots Clés : Caatinga Estresse hídrico Mimosa artemisiana Promoção de crescimento de plantas Rizobactérias Caatinga Mimosa artemisiana Promotion of growth plants Rhizobacteria Water stress

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Page publiée le 4 septembre 2016, mise à jour le 27 juillet 2017