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Ability to produce indole acetic acid is associated with improved phosphate solubilising activity of rhizobacteria

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Abstract

Indole acetic acid (IAA) can upregulate genes encoding enzymes responsible for the synthesis of carboxylates involved in phosphorus (P) solubilisation. Here, we investigated whether IAA and its precursor affect the P-solubilising activity of rhizobacteria. A total of 841 rhizobacteria were obtained using taxonomically selective and enrichment isolation methods. Phylogenetic analysis revealed 15 genera of phosphate solubilising bacteria (PSB) capable of producing a wide range of IAA concentrations between 4.1 and 67.2 µg mL−1 in vitro. Addition of l-tryptophan to growth media improved the P-solubilising activity of PSB that were able to produce IAA greater than 20 µg mL−1. This effect was connected to the drop of pH and release of a high concentration of carboxylates, comprising α-ketoglutarate, cis-aconitate, citrate, malate and succinate. An increase in production of organic acids rather than IAA production per se appears to result in the improved P solubilisation in PSB.

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The datasets generated during and/or analysed during the current study are available from the first author on reasonable request.

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Acknowledgements

Financial support of this work was provided by the Australian Research Council (project ID:IH140100013), the Grains Research and Development Corporation, the Department of Trade, Tourism and Investment of the South Australian Government, The University of Adelaide, and Research Training Program Scholarship from The University of Adelaide. The authors thanks Tiffany McClure, Ballance Agri-Nutrients, New Zealand for providing rock phosphate.

Funding

Financial support of this work was provided by the Australian Research Council (project ID: IH140100013), the Grains Research and Development Corporation, the Department of Trade, Tourism and Investment of the South Australian Government, The University of Adelaide, and Research Training Program Scholarship from The University of Adelaide.

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  1. School of Agriculture, Food and Wine, The University of Adelaide, Glen Osmond, SA, 5064, Australia

    Anteneh Argaw Alemneh, Yi Zhou, Maarten H. Ryder & Matthew D. Denton

  2. China-Australia Joint Laboratory for Soil Ecological Health and Remediation, The University of Adelaide, Glen Osmond, SA, 5064, Australia

    Anteneh Argaw Alemneh, Yi Zhou, Maarten H. Ryder & Matthew D. Denton

  3. School of Biological Sciences, The University of Western Australia, 35 Stirling Hwy, Crawley, Perth, WA, 6009, Australia

    Gregory R. Cawthray

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Alemneh, A.A., Cawthray, G.R., Zhou, Y. et al. Ability to produce indole acetic acid is associated with improved phosphate solubilising activity of rhizobacteria. Arch Microbiol 203, 3825–3837 (2021). https://doi.org/10.1007/s00203-021-02364-w

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