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Revista Brasileira de Ciência do Solo ISSN: 0100-0683 [email protected] Sociedade Brasileira de Ciência do Solo Brasil Fernandes-Júnior, Paulo Ivan; de Tarso Aidar, Saulo; Morgante, Carolina Vianna; Tuão Gava, Carlos Alberto; Zilli, Jerri Édson; Silva Barbosa de Souza, Layane; Nunes Marinho, Rita de Cássia; Simão Abrahão Nóbrega, Rafaela; da Silva Brasil, Marivaine; Lima Seido, Sirando; Vieira Martins, Lindete Míria THE RESURRECTION PLANT Tripogon spicatus (POACEAE) HARBORS A DIVERSITY OF PLANT GROWTH PROMOTING BACTERIA IN NORTHEASTERN BRAZILIAN CAATINGA Revista Brasileira de Ciência do Solo, vol. 39, núm. 4, 2015, pp. 993-1002 Sociedade Brasileira de Ciência do Solo Viçosa, Brasil Available in: http://www.redalyc.org/articulo.oa?id=180241055007 Abstract Plant species that naturally occur in the b razilian Caatinga (xeric shrubland) adapt in several ways to these harsh conditions, and that can be exploited to increase crop production. a mong the strategic adaptations to confront low water availability, desiccation tolerance stands out. Up to now, the association of those species with beneficial soil microorganisms is not well understood. The aim of this study was to characterize Tripogon spicatus diazotrophic bacterial isolates from the Caatinga biome and evaluate their ability to promote plant growth in rice. s ixteen bacterial isolates were studied in regard to their taxonomic position by partial sequencing of the 16 s rR na gene, putative diazotrophic capacity, in vitro indole-acetic acid ( iaa ) production and calcium phosphate solubilization, metabolism of nine different c sources in semi-solid media, tolerance to different concentrations of n a c l to p h s and intrinsic resistance to nine antibiotics. f inally, the ability of the bacterial isolates to promote plant growth was evaluated using rice ( Oryza sativa ) as a model plant. a mong the 16 isolates evaluated, eight of them were classified as Enterobacteriaceae members, related to Enterobacter and Pantoea genera. s ix other bacteria were related to Bacillus , and the remaining two were related to Rhizobium and StenotrophomonasThe evaluation of total n incorporation into the semi-solid medium indicated that all the bacteria studied have putative diazotrophic capacity. Two bacteria were able to produce more iaa than that observed for the strain b R 11175 T of Herbaspirillum seropedicae. b acterial isolates were also able to form a microaerophilic pellicle in a semi-solid medium supplemented with different n a c l concentrations up to 1.27 mol l -1 . i ntrinsic resistance to antibiotics and the metabolism of different C sources indicated a great variation in physiological profile. Seven isolates were able to promote rice growth, and two bacteria were more efficient than the reference strain Azospirillum brasilense , a b- v 5. The results indicate the potential of T. spicatus as native plant source of plant growth promoting bacteria. Keywords Biological nitrogen fixation, inoculant, diazotrophic bacteria, s emi-arid, desiccation tolerant plants. How to cite Complete issue More information about this article Journal's homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative