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|Title:||Ability to produce indole acetic acid is associated with improved phosphate solubilising activity of rhizobacteria|
|Citation:||Archives of Microbiology, 2021; 203(7):3825-3837|
|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|
|Appears in Collections:||Agriculture, Food and Wine publications|
Aurora harvest 8
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