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Toxic heavy metal/oxyanion tolerance in haloarchaea from some saline and hypersaline ecosystems.
Tavoosi, Nazanin; Akhavan Sepahi, Abbas; Amoozegar, Mohammad Ali; Kiarostami, Vahid.
Afiliação
  • Tavoosi N; Department of Microbiology, Faculty of Biological Sciences, Islamic Azad University, North Tehran Branch, Tehran, Iran.
  • Akhavan Sepahi A; Department of Microbiology, Faculty of Biological Sciences, Islamic Azad University, North Tehran Branch, Tehran, Iran.
  • Amoozegar MA; Extremophiles Laboratory, Department of Microbiology, School of Biology and Center of Excellence in Phylogeny of Living Organisms, College of Science, University of Tehran, Tehran, Iran.
  • Kiarostami V; Department of Chemistry, Faculty of Basic Sciences, Islamic Azad University, North Tehran Branch, Tehran, Iran.
J Basic Microbiol ; 63(5): 558-569, 2023 May.
Article em En | MEDLINE | ID: mdl-36892092
Toxic heavy metal/oxyanion contamination has increased severely through the last decades. In this study, 169 native haloarchaeal strains were isolated from different saline and hypersaline econiches of Iran. After providing pure culture and performing morphological, physiological, and biochemical tests, haloarchaea resistance toward arsenate, selenite, chromate, cadmium, zinc, lead, copper, and mercury were surveyed using an agar dilution method. On the basis of minimum inhibitory concentrations (MICs), the least toxicities were found with selenite and arsenate, while the haloarchaeal strains revealed the highest sensitivity for mercury. On the other hand, the majority of haloarchaeal strains exhibited similar responses to chromate and zinc, whereas the resistance level of the isolates to lead, cadmium, and copper was very heterogeneous. 16 S ribosomal RNA (rRNA) gene sequence analysis revealed that most haloarchaeal strains belong to the Halorubrum and Natrinema genera. The obtained results from this study showed that among the identified isolates, Halococcus morrhuae strain 498 had an exceptional resistance toward selenite and cadmium (64 and 16 mM, respectively). Also, Halovarius luteus strain DA5 exhibited a remarkable tolerance against copper (32 mM). Moreover, strain Salt5, identified as Haloarcula sp., was the only strain that could tolerate all eight tested heavy metals/oxyanions and had a significant tolerance of mercury (1.5 mM).
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Metais Pesados / Mercúrio Idioma: En Ano de publicação: 2023 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Metais Pesados / Mercúrio Idioma: En Ano de publicação: 2023 Tipo de documento: Article