Comparison of the bacterial community and characterization of plant growth-promoting rhizobacteria from different genotypes of <Emphasis Type="Italic">Chrysopogon zizanioides</Emphasis> (L.) Roberty (Vetiver) rhizospheres |
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Authors: | Juliana?Mendes?Monteiro Renata?Estebanez?Vollú Marcia?Reed?Rodrigues?Coelho Celuta?Sales?Alviano Arie?Fitzgerald?Blank Email author" target="_blank">Lucy?SeldinEmail author |
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Institution: | 1.Instituto de Microbiologia Prof. Paulo de Góes,Universidade Federal do Rio de Janeiro,Rio de Janeiro,Brazil;2.Departamento de Engenharia Agron?mica,Universidade Federal do Sergipe,Sergipe,Brazil |
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Abstract: | Molecular approaches PCR-denaturing gradient gel electrophoresis (DGGE)] were used to determine whether three different vetiver
(Chrysopogon zizanioides) genotypes, commercially used in Brazil and considered economically important over the world, select specific bacterial populations
to coexist in their rhizospheres. DGGE profiles revealed that the predominant rhizospheric bacterial community hardly varies
regarding the vetiver genotype. Moreover, using traditional cultivation methods, bacterial strains were isolated from the
different rhizospheres. Colonies presenting different morphologies (83) were selected for determining their potential for
plant growth promotion. More than half of the strains tested (57.8%) were amplified by PCR using nifH-based primers, specific for the enzyme nitrogenase reductase. The production of siderophores was observed in 88% of the strains,
while the production of antimicrobial substances was detected in only 14.5% of the isolates when Micrococcus sp. was used as the indicator strain. Production of indole-3-acetic acid and the solubilization of phosphate were observed
in 55.4% and 59% of the isolates, respectively. In total, 44 strains (53%) presented at least three characteristics of plant
growth promotion and were submitted to amplified ribosomal DNA restriction analysis. Twenty-four genetic groups were formed
at 100% similarity and one representative of each group was selected for their identification by partial 16S rRNA gene sequencing.
They were affiliated with the genera Acinetobacter, Comamonas, Chryseobacterium, Klebsiella, Enterobacter, Pantoea, Dyella, Burkholderia, or Pseudomonas. These strains can be considered of great importance as possible biofertilizers in vetiver. |
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