Naturwissenschaften

, Volume 91, Issue 11, pp 552–555

Gluconic acid production and phosphate solubilization by the plant growth-promoting bacterium Azospirillum spp.

  • Hilda Rodriguez
  • Tania Gonzalez
  • Isabel Goire
  • Yoav Bashan
Short Communication

DOI: 10.1007/s00114-004-0566-0

Cite this article as:
Rodriguez, H., Gonzalez, T., Goire, I. et al. Naturwissenschaften (2004) 91: 552. doi:10.1007/s00114-004-0566-0

Abstract

In vitro gluconic acid formation and phosphate solubilization from sparingly soluble phosphorus sources by two strains of the plant growth-promoting bacteria A. brasilense (Cd and 8-I) and one strain of A. lipoferum JA4 were studied. Strains of A. brasilense were capable of producing gluconic acid when grown in sparingly soluble calcium phosphate medium when their usual fructose carbon source is amended with glucose. At the same time, there is a reduction in pH of the medium and release of soluble phosphate. To a greater extent, gluconic acid production and pH reduction were observed for A. lipoferum JA4. For the three strains, clearing halos were detected on solid medium plates with calcium phosphate. This is the first report of in vitro gluconic acid production and direct phosphate solubilization by A. brasilense and the first report of P solubilization by A. lipoferum. This adds to the very broad spectrum of plant growth-promoting abilities of this genus.

Copyright information

© Springer-Verlag 2004

Authors and Affiliations

  • Hilda Rodriguez
    • 1
  • Tania Gonzalez
    • 1
  • Isabel Goire
    • 1
  • Yoav Bashan
    • 2
  1. 1.Cuban Research Institute on Sugarcane By-Products (ICIDCA)HavanaCuba
  2. 2.Environmental Microbiology GroupCenter for Biological Research of the Northwest (CIB)La PazMexico

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