Properly interpret metabolic inhibition results to identify primary mercury methylating microbes

Lei, Pei; Yu, Ri-Qing; Kong, Yaqi; Bertilsson, Stefan; Tsui, Martin Tsz‐Ki; Jiang, Tao; Zhao, Jiating; Liu, Yurong; Rinklebe, Joerg; Zhong, Huan

doi:10.1080/10643389.2023.2183072

Cited by 5 publications

(2 citation statements)

References 89 publications

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“…Flooding condition creates a soil environment that is conducive to Hg methylation, predominantly influenced by different groups of anaerobic microorganisms and organic carbon. 4,5 MeHg in paddy fields can be readily accumulated by rice plants. Rice grain contains much higher levels of MeHg and therefore constitutes the main dietary source of this element, particularly for populations in Asia where rice serves as a primary source of carbohydrate.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Paddy fields are hotspots for MeHg production because they are periodically flooded for rice cultivation. Flooding condition creates a soil environment that is conducive to Hg methylation, predominantly influenced by different groups of anaerobic microorganisms and organic carbon. , MeHg in paddy fields can be readily accumulated by rice plants. Rice grain contains much higher levels of MeHg and therefore constitutes the main dietary source of this element, particularly for populations in Asia where rice serves as a primary source of carbohydrate. , For example, MeHg concentration in rice grain from a Hg mining region in China was 30.6 ng g –1 , higher than the total Hg (THg) limit in rice grain (20 ng g –1 ) defined by the Chinese government .…”

Section: Introductionmentioning

confidence: 99%

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New Insights into MeHg Accumulation in Rice (Oryza sativa L.): Evidence from Cysteine

Man,

Wang,

Wang

et al. 2024

Environ. Sci. Technol.

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The intake of methylmercury (MeHg)-contaminated rice poses immense health risks to rice consumers. However, the mechanisms of MeHg accumulation in rice plants are not entirely understood. The knowledge that the MeHg−Cysteine complex was dominant in polished rice proposed a hypothesis of co-transportation of MeHg and cysteine inside rice plants. This study was therefore designed to explore the MeHg accumulation processes in rice plants by investigating biogeochemical associations between MeHg and amino acids. Rice plants and underlying soils were collected from different Hgcontaminated sites in the Wanshan Hg mining area. The concentrations of both MeHg and cysteine in polished rice were higher than those in other rice tissues. A significant positive correlation between MeHg and cysteine in rice plants was found, especially in polished rice, indicating a close geochemical association between cysteine and MeHg. The translocation factor (TF) of cysteine showed behavior similar to that of the TF of MeHg, demonstrating that these two chemical species might share a similar transportation mechanism in rice plants. The accumulation of MeHg in rice plants may vary due to differences in the molar ratios of MeHg to cysteine and the presence of specific amino acid transporters. Our results suggest that cysteine plays a vital role in MeHg accumulation and transportation inside rice plants.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

New Insights into MeHg Accumulation in Rice (Oryza sativa L.): Evidence from Cysteine

Man,

Wang,

Wang

et al. 2024

Environ. Sci. Technol.

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Recent advance of microbial mercury methylation in the environment

Peng,

Yang,

Yang

et al. 2024

Appl Microbiol Biotechnol

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Methylmercury formation is mainly driven by microbial-mediated process. The mechanism of microbial mercury methylation has become a crucial research topic for understanding methylation in the environment. Pioneering studies of microbial mercury methylation are focusing on functional strain isolation, microbial community composition characterization, and mechanism elucidation in various environments. Therefore, the functional genes of microbial mercury methylation, global isolations of Hg methylation strains, and their methylation potential were systematically analyzed, and methylators in typical environments were extensively reviewed. The main drivers (key physicochemical factors and microbiota) of microbial mercury methylation were summarized and discussed. Though significant progress on the mechanism of the Hg microbial methylation has been explored in recent decade, it is still limited in several aspects, including (1) molecular biology techniques for identifying methylators; (2) characterization methods for mercury methylation potential; and (3) complex environmental properties (environmental factors, complex communities, etc.). Accordingly, strategies for studying the Hg microbial methylation mechanism were proposed. These strategies include the following: (1) the development of new molecular biology methods to characterize methylation potential; (2) treating the environment as a micro-ecosystem and studying them from a holistic perspective to clearly understand mercury methylation; (3) a more reasonable and sensitive inhibition test needs to be considered. Key points • Global Hg microbial methylation is phylogenetically and functionally discussed. • The main drivers of microbial methylation are compared in various condition. • Future study of Hg microbial methylation is proposed. Graphical Abstract

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Algal organic matter inhibits methylmercury photodegradation in eutrophic lake water: A dynamic study

Lei

Zhu

Zhang

et al. 2023

Science of The Total Environment

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Properly interpret metabolic inhibition results to identify primary mercury methylating microbes

Cited by 5 publications

References 89 publications

New Insights into MeHg Accumulation in Rice (Oryza sativa L.): Evidence from Cysteine

New Insights into MeHg Accumulation in Rice (Oryza sativa L.): Evidence from Cysteine

Recent advance of microbial mercury methylation in the environment

Algal organic matter inhibits methylmercury photodegradation in eutrophic lake water: A dynamic study

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