Auxin production of the filamentous cyanobacterial Planktothricoides strain isolated from a polluted river in Vietnam

Cyanobacteria are photosynthetic microorganisms with widespread diversity and extensive global distribution. They produce a wide variety of bioactive substances (e.g., lipopeptides, fatty acids, toxins, carotenoids, vitamins and plant growth regulators) that are released into culture media. In this...

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Published in:	Chemosphere (Oxford) Vol. 284; p. 131242
Main Authors:	Duong, Thi Thuy, Nguyen, Thi Thu Lien, Dinh, Thi Hai Van, Hoang, Thi Quynh, Vu, Thi Nguyet, Doan, Thi Oanh, Dang, Thi Mai Anh, Le, Thi Phuong Quynh, Tran, Dang Thuan, Le, Van Nhan, Nguyen, Quang Trung, Le, Phuong Thu, Nguyen, Trung Kien, Pham, Thi Dau, Bui, Ha Manh
Format:	Journal Article
Language:	English
Published:	Elsevier Ltd 01-12-2021
Subjects:	Biofertilizer Cyanobacteria Indole-3-acetic acid Planktothricoides raciborskii Polluted river Biofertilizer Indole-3-acetic acid Planktothricoides raciborskii Polluted river Cyanobacteria
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Summary:	Cyanobacteria are photosynthetic microorganisms with widespread diversity and extensive global distribution. They produce a wide variety of bioactive substances (e.g., lipopeptides, fatty acids, toxins, carotenoids, vitamins and plant growth regulators) that are released into culture media. In this study, the capability of a cyanobacterial strain of Planktothricoides raciborskii to produce intra- and extracellular auxins was investigated. The filamentous cyanobacterial P. raciborskii strain was isolated from a river in Vietnam, and it was cultivated in the laboratory under the optimum conditions of the BG11 culture medium and a pH of 7.0. The auxins were identified and quantified by the Salkowski colorimetric method and high-performance liquid chromatography coupled with mass spectrometry (HPLC–MS). Colorimetric analysis revealed that P. raciborskii produces extracellular indole-3-acetic acid (IAA) in the absence and presence of l-tryptophan. The maximum extracellular IAA concentration of the culture reached 118 ± 2 μg mL−1, which was supplemented with 900 μg mL−1 of l-tryptophan. HPLC–MS analysis revealed that the isolated cyanobacteria accumulate other plant-growth-promoting hormones besides IAA, such as indole-3-carboxylic acid (ICA), indole-3 butyric acid (IBA) and indole propionic acid (IPA). This is the first report on the production of auxins in an isolated strain of cyanobacteria Planktothricoides from a polluted river. The capability of producing auxins makes the P. raciborskii strain an appropriate candidate for the formulation of a biofertilizer. [Display omitted] •Planktothricoides raciborskii was isolated from a polluted river in Vietnam and cultured in BG 11 medium.•Four Auxins (IBA, IPA, ICA, IAA) were found in the isolated P. raciborskii strain by HPLC-ESI-MS/MS analysis.•Increased levels of IAA was observed in P. raciborskii strain under supplementation of l-tryptophan.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0045-6535 1879-1298
DOI:	10.1016/j.chemosphere.2021.131242