title: Analysis of the plant growth-promoting properties encoded by the genome of the rhizobacterium Pseudomonas putida BIRD-1.
abstract: Pseudomonas putida BIRD-1 is a plant growth-promoting rhizobacterium whose genome size is 5.7 Mbp. It adheres to plant roots and colonizes the rhizosphere to high cell densities even in soils with low moisture. This property is linked to its ability to synthesize trehalose, since a mutant deficient in the synthesis of trehalose exhibited less tolerance to desiccation than the parental strain. The genome of BIRD-1 encodes a wide range of proteins that help it to deal with reactive oxygen stress generated in the plant rhizosphere. BIRD-1 plant growth-promoting rhizobacteria properties derive from its ability to enhance phosphorous and iron solubilization and to produce phytohormones. BIRD-1 is capable of solubilizing insoluble inorganic phosphate forms through acid production. The genome of BIRD-1 encodes at least five phosphatases related to phosphorous solubilization, one of them being a phytase that facilitates the utilization of phytic acid, the main storage form of phosphorous in plants. Pyoverdine is the siderophore produced by this strain, a mutant that in the FvpD siderophore synthase failed to grow on medium without supplementary iron, but the mutant was as competitive as the parental strain in soils because it captures the siderophores produced by other microbes. BIRD-1 overproduces indole-3-acetic acid through convergent pathways.
authors.affiliation: Polígono Industrial Juncaril, Bio-Iliberis R&D, 18210, Peligros, Granada, Spain.
authors.forename: Amalia
authors.initials: A
authors.lastname: Roca
authors.forename: Paloma
authors.initials: P
authors.lastname: Pizarro-Tobías
authors.forename: Zulema
authors.initials: Z
authors.lastname: Udaondo
authors.forename: Matilde
authors.initials: M
authors.lastname: Fernández
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Matilla
authors.forename: M Antonia
authors.initials: MA
authors.lastname: Molina-Henares
authors.forename: Lázaro
authors.initials: L
authors.lastname: Molina
authors.forename: Ana
authors.initials: A
authors.lastname: Segura
authors.forename: Estrella
authors.initials: E
authors.lastname: Duque
authors.forename: Juan-Luis
authors.initials: JL
authors.lastname: Ramos
mesh_terms: D016678:Genome; D007210:Indoleacetic Acids / Q000378:metabolism; D010710:Phosphates / Q000378:metabolism; D010937:Plant Growth Regulators / Q000378:metabolism; D018517:Plant Roots / Q000382:microbiology; D016958:Pseudomonas putida / Q000201:enzymology / Q000235:genetics* / Q000378:metabolism; D036226:Seedlings / Q000254:growth & development / Q000382:microbiology; D017262:Siderophores / Q000378:metabolism; D012988:Soil Microbiology; D003313:Zea mays / Q000254:growth & development* / Q000382:microbiology*
chemical_list: D007210:Indoleacetic Acids; D010710:Phosphates; D010937:Plant Growth Regulators; D017262:Siderophores; C030737:indoleacetic acid