通过微生物适应和生物地化学变化提高了米田中的甲基水平
Qiang Pu1, Zhengdong Hao1,2, Qianshuo Zhang1,2
1State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China.
Environmental science & technology
|October 22, 2025
概括
土中的 (Cd) 污染会增加米粒中的甲基 (MeHg) 含量. 这通过微生物和地化学变化发生,突出显示Cd是大米消费者MeHg风险的关键因素.
科学领域:
- 环境科学 环境科学
- 农业科学 农业科学
- 毒理学 毒理学 毒理学
背景情况:
- 中的甲基 (MeHg) 对食用大米的人群来说是一个重大的健康问题.
- (Cd) 污染在土中很常见,但其对大米MeHg积累的影响尚不清楚.
研究的目的:
- 研究 (Cd) 对米和土中的甲基 (MeHg) 积累的影响.
- 阐明驱动这种相互作用的潜在微生物和地化学机制.
主要方法:
- 全国103个大米田的全国性调查.
- 控制的和化实验.
- 对土壤地球化学,微生物群落和水平基因转移 (HGT) 的分析.
主要成果:
- 土壤中的度与大米的MeHg水平呈正相关性,不论总含量如何.
- 在受控实验中,Cd暴露增加了土壤和米粒中的MeHg.
- Cd改变了微生物群落,促进了HGT,有利于Hg甲基化细菌,并改变了有利于Hg甲基化的土壤条件.
结论:
- 是一种重要的,以前未被识别的因素,在水农业生态系统中驱动甲基风险.
- 对多种金属污染物 (Cd和Hg) 的综合管理对于减轻来自大米消费的MeHg暴露至关重要,特别是在全球大米种植地区.
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