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Indole acetic acid and phytase activity produced by rhizosphere bacilli as affected by pH and metals

Research output: Contribution to Journal/MagazineJournal articlepeer-review

  • J. J. Acuna
  • M. A. Jorquera
  • O. A. Martinez
  • D. Menezes-Blackburn
  • M. T. Fernandez
  • P. Marschner
  • R. Greiner
  • M. L. Mora
<mark>Journal publication date</mark>2011
<mark>Journal</mark>Journal of Soil Science and Plant Nutrition
Issue number3
Number of pages12
Pages (from-to)1-12
Publication StatusPublished
<mark>Original language</mark>English


The abilities to produce indole acetic acid (IAA) and mineralize organic phosphorus by phytase are desirable traits in plant-growth promotion rhizobacteria (PGPR) particularly in Chilean Andisols which are characterized by low pH and high total P. However, little is known about the influence of soil properties that are specific to Andisol (low pH and metal toxicity) on the effectiveness of PGPR. Here, we assessed the effect of pH and metal cations on IAA and phytase activity of cell-associated proteins produced by two bacilli strains isolated from the rhizosphere of pasture plants. The production in vivo of IAA by Paenibacillus sp. SPT-03 was significantly increased (7-fold) when incubated in tenfold diluted culture medium, compared to the full-strength medium. At low pH (pH