Journal
ARCHIVES OF MICROBIOLOGY
Volume 191, Issue 5, Pages 477-483Publisher
SPRINGER
DOI: 10.1007/s00203-009-0472-0
Keywords
Gluconacetobacter diazotrophicus; Genomic functional analysis; Transposon mutant library; Phosphorus solubilization; Zinc solubilization
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Gluconacetobacter diazotrophicus is a plant-growth-promoting bacterium, which is able to colonize sugarcane and other plant species of economic importance. The potentially beneficial effects promoted by this bacterium on plants are nitrogen-fixation, production of phythormones, action against pathogens and mineral nutrient solubilization. In this study, the molecular mechanisms associated with phosphorus and zinc solubilization were analyzed. A transposon mutant library was constructed and screened to select for mutants defective for phosphorous [Ca-5(PO4)(3)OH] and zinc (ZnO) solubilization. A total of five mutants were identified in each screen. Both screenings, performed independently, allowed to select the same mutants. The interrupted gene in each mutant was identified by sequencing and the results demonstrate that the production of gluconic acid is a required pathway for solubilization of such nutrients in G. diazotrophicus.
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