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KMID : 0545120190290010105
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Journal of Microbiology and Biotechnology
2019 Volume.29 No. 1 p.105 ~ p.113
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Zinc Ions Affect Siderophore Production by Fungi Isolated from the Panax ginseng Rhizosphere
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Hussein Khalid Abdallah
Joo Jin-Ho
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Abstract
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Although siderophore compounds are mainly biosynthesized as a response to iron deficiency in the environment, they also bind with other metals. A few studies have been conducted on the impact of heavy metals on the siderophore-mediated iron uptake by microbiome. Here, we investigated siderophore production by a variety of rhizosphere fungi under different concentrations of Zn2+ ion. These strains were specifically isolated from the rhizosphere of Panax ginseng (Korean ginseng). The siderophore production of isolated fungi was investigated with chrome azurol S (CAS) assay liquid media amended with different concentrations of Zn2+ (50 to 250 μg/ml). The percentage of siderophore units was quantified using the ultra-violet (UV) irradiation method. The results indicated that high concentrations of Zn2+ ion increase the production of siderophore in iron-limited cultures. Maximum siderophore production by the fungal strains was detected at Zn2+ ion concentration of 150 μg/ml except for Mortierella sp., which had the highest siderophore production at 200 μg/ml. One potent siderophoreproducing strain (Penicillium sp. JJHO) was strongly influenced by the presence of Zn2+ ions and showed high identity to P. commune (100% using 18S-rRNA sequencing). The purified siderophores of the Penicillium sp. JJHO strain were chemically identified using UV, Fouriertransform infrared spectroscopy (FTIR), and matrix-assisted laser desorption/ionization timeof- flight mass spectrometer (MALDI-TOF-MS) spectra.
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KEYWORD
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Root-associated fungi, siderophores, Zn2+, Penicillium commune
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