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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.
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