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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
Statement of
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
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Appears in Collections:Agriculture, Food and Wine publications
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