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In vitro growth and indoleacetic acid production by Mesorhizobium loti SEMIA806 and SEMIA816 under the influence of copper ions

Jéssica Dutra Vieira, Paulo Roberto Diniz da Silva, Valdir Marcos Stefenon
  • Jéssica Dutra Vieira
    Núcleo de Microbiologia Aplicada à Biorremediação, Universidade Federal do Pampa, Campus São Gabriel, Brazil
  • Paulo Roberto Diniz da Silva
    Núcleo de Cultura de Tecidos Vegetais, Universidade Federal do Pampa, Campus São Gabriel, Brazil
  • Valdir Marcos Stefenon
    Núcleo de Microbiologia Aplicada à Biorremediação, Núcleo de Cultura de Tecidos Vegetais, Programa de Pós Graduação em Ciências Biológicas, Universidade Federal do Pampa, Campus São Gabriel, Brazil | valdirstefenon@unipampa.edu.br

Abstract

The indoleacetic acid produced by symbiotic bacteria is an important phytohormone signaling microbe-plant interaction, being therefore essential for rhizoremediation. In this study, the effect of different concentrations of copper ions on the bacterial growth and indoleacetic acid production was investigated in two strains of Mesorhizobium loti in in vitro conditions, aiming to determine critical concentrations of this heavy metal for rhizoremediation of contaminated soils using this bacterium. The experiment consisted on a control culture without copper and three treatments supplemented with 10 mg.L-1, 20 mg.L-1 or 50 mg.L-1 of CuSO4. For both strains, the growth stopped after 48h and no significant difference was observed across treatments. The production of indoleacetic acid by the control treatment without copper was significantly higher in comparison to the copper- containing treatments. Mesorhizobium loti SEMIA806 and SEMIA816 are resistant to up to 50 mg.L-1 of CuSO4 in the culture medium, presenting effective growth. The synthesis of indoleacetic acid was strongly reduced but not excluded by ions copper in the medium. So, it is expected that environmental copper found in the soil up to the concentration of 50 mg.L-1 will not preclude the symbiotic interaction between M. loti and leguminous host plant in rhizoremediation enterprises.

Keywords

Bacterial growth, bioremediation, IAA, rhizobia, rhizoremediation

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Submitted: 2017-07-05 20:32:46
Published: 2017-11-07 10:33:50
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