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https://hdl.handle.net/2440/130523
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Type: | Journal article |
Title: | Ability to produce indole acetic acid is associated with improved phosphate solubilising activity of rhizobacteria |
Author: | Alemneh, A.A. Cawthray, G.R. Zhou, Y. Ryder, M.H. Denton, M.D. |
Citation: | Archives of Microbiology, 2021; 203(7):3825-3837 |
Publisher: | Springer-Verlag |
Issue Date: | 2021 |
ISSN: | 0302-8933 1432-072X |
Statement of Responsibility: | Anteneh Argaw Alemneh, Gregory R. Cawthray, Yi Zhou, Maarten H. Ryder, Matthew D. Denton |
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. |
Keywords: | Acidification; IAA; l-tryptophan; rhizobacteria; rock phosphate |
Rights: | © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021 |
DOI: | 10.1007/s00203-021-02364-w |
Grant ID: | http://purl.org/au-research/grants/arc/IH140100013 |
Published version: | http://dx.doi.org/10.1007/s00203-021-02364-w |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 8 |
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