Journal
MYCOBIOLOGY
Volume -, Issue -, Pages -Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/12298093.2023.2274648
Keywords
Biosorption; copper-tolerant yeast; Rhodotorula; copper stress; gold mining
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In this study, 25 yeast strains were isolated from soil samples collected in gold mining ore in Gia Lai, Vietnam. Among them, one isolate named GL1(T) exhibited high tolerance to Cu2+ and could grow in a wide range of pH and temperature. The dried biomass of the isolate showed effective removal of Cu2+, and phylogenetic analysis suggested it belonged to a novel Rhodotorula species.
In this study, twenty-five yeast strains were isolated from soil samples collected in the gold mining ore in Gia Lai, Vietnam. Among them, one isolate named GL1(T) could highly tolerate Cu2+ up to 10 mM, and the isolates could also grow in a wide range of pH (3-7), and temperature (10-40 degrees C). Dried biomass of GL1 was able to remove Cu2+ effectively up to 90.49% with a maximal biosorption capacity of 18.1 mg/g at pH 6, temperature 30 degrees C, and incubation time 60 min. Sequence analysis of rDNA indicated this strain was closely related to Rhodotorula mucilaginosa but with 1.53 and 3.46% nucleotide differences in the D1/D2 domain of the 28S rRNA gene and the ITS1-5.8S rRNA gene-ITS2 region sequence, respectively. Based on phylogenetic tree analysis and the biochemical characteristics, the strain appears to be a novel Rhodotorula species, and the name Rhodotorula aurum sp. nov. is proposed. This study provides us with more information about heavy metal-tolerant yeasts and it may produce a new tool for environmental control and metal recovery operations.
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