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The coupling effect promotes superoxide radical production in the microalgal-fungal symbiosis systems: Production, mechanisms and implication for Hg(II) reduction.
Ai, Dan; Wu, Tao; Ge, Zuhan; Ying, Zeguo; Sun, Shiqing; Huang, Deying; Zhang, Jibiao.
Afiliación
  • Ai D; National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, PR China.
  • Wu T; National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, PR China.
  • Ge Z; National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, PR China.
  • Ying Z; National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, PR China.
  • Sun S; National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, PR China.
  • Huang D; Department of Chemistry, Fudan University, Shanghai 200433, PR China; Shanghai Shifang Ecology and Landscape Co., Ltd, Shanghai 200233, PR China.
  • Zhang J; National Observations and Research Station for Wetland Ecosystems of the Yangtze Estuary, Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, PR China; Shanghai Shifang Ecology and Landscape Co., Ltd, Shanghai 200233, PR China. Electronic address: jbzhang@fudan.ed
J Hazard Mater ; 477: 135347, 2024 Sep 15.
Article en En | MEDLINE | ID: mdl-39084012
ABSTRACT
Redox transformation of mercury (Hg) is critical for Hg exchange at the air-water interface. However, the superoxide radicals (O2•─) contribution of microalgal-fungal symbiotic systems in lake water to Hg(II) reduction is mainly unknown. Here, we studied the enhanced potential for O2•─ production by the coupling effect between microalgae and fungi. The relationships between microenvironment, microorganisms, and O2•─ production were also investigated. Furthermore, the implication of O2•─ for Hg(II) reduction was explored. The results showed that the coupling effect of microalgae and fungi enhanced O2•─ generation in the symbiotic systems, and the O2•─ generation peaked on day 4 in the lake water at 160.51 ± 13.06-173.28 ± 18.21 µmol/kg FW (fresh weight). In addition, O2•- exhibited circadian fluctuations that correlated with changes in dissolved oxygen content and redox potential on the inter-spherical interface of microalgal-fungal consortia. Partial least squares path modeling (PLS-PM) indicates that O2•─ formation was primarily associated with microenvironmental factors and microbial metabolic processes. The experimental results suggest that O2•─ in the microalgal-fungal systems could mediate Hg(II) reduction, promoting Hg conversion and cycling. The findings highlight the importance of microalgae and fungal symbiotic systems in Hg transformation in aquatic environments.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Oxidación-Reducción / Simbiosis / Superóxidos / Microalgas / Mercurio Idioma: En Revista: J Hazard Mater Asunto de la revista: SAUDE AMBIENTAL Año: 2024 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Oxidación-Reducción / Simbiosis / Superóxidos / Microalgas / Mercurio Idioma: En Revista: J Hazard Mater Asunto de la revista: SAUDE AMBIENTAL Año: 2024 Tipo del documento: Article Pais de publicación: Países Bajos