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

Autor: Alemneh AA; School of Agriculture, Food and Wine, The University of Adelaide, Glen Osmond, SA, 5064, Australia.; China-Australia Joint Laboratory for Soil Ecological Health and Remediation, The University of Adelaide, Glen Osmond, SA, 5064, Australia., Cawthray GR; School of Biological Sciences, The University of Western Australia, 35 Stirling Hwy, Crawley, Perth, WA, 6009, Australia., Zhou Y; School of Agriculture, Food and Wine, The University of Adelaide, Glen Osmond, SA, 5064, Australia. yi.zhou@adelaide.edu.au.; China-Australia Joint Laboratory for Soil Ecological Health and Remediation, The University of Adelaide, Glen Osmond, SA, 5064, Australia. yi.zhou@adelaide.edu.au., Ryder MH; School of Agriculture, Food and Wine, The University of Adelaide, Glen Osmond, SA, 5064, Australia.; China-Australia Joint Laboratory for Soil Ecological Health and Remediation, The University of Adelaide, Glen Osmond, SA, 5064, Australia., Denton MD; School of Agriculture, Food and Wine, The University of Adelaide, Glen Osmond, SA, 5064, Australia.; China-Australia Joint Laboratory for Soil Ecological Health and Remediation, The University of Adelaide, Glen Osmond, SA, 5064, Australia.
Jazyk: angličtina
Zdroj: Archives of microbiology [Arch Microbiol] 2021 Sep; Vol. 203 (7), pp. 3825-3837. Date of Electronic Publication: 2021 May 17.
DOI: 10.1007/s00203-021-02364-w
Abstrakt: 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.
(© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.)
Databáze: MEDLINE
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