以为媒介的树根球氧化改造和根内防御协同缓解了在大米中的积累
Yongqiang Yang1, Mingjun Li2, Yanfang Wu3
1School of the Environment, Henan University of Technology, Zhengzhou, Henan 450001, China; Henan International Joint Laboratory of Environmental Pollution, Remediation and Grain Quality Security, Zhengzhou, Henan 450001, China.
Ecotoxicology and environmental safety
|February 11, 2026
概括
的应用通过增强根基防御和改变土壤化学物质来减少大米中的. 这项研究阐明了 (Se) 如何通过抗氧化活性和改善土壤中铁相互作用来减轻 (As) 毒性.
科学领域:
- 环境科学 环境科学
- 农业科学 农业科学
- 生物化学 生物化学
背景情况:
- 已知 (Se) 的应用可以减少 (As) 在大米中的积累.
- Se-mediated As中毒性减轻的机制,特别是涉及树根球反应性氧物种和Fe-氧化-As动态,尚不清楚.
- 了解这些机制对于管理田土壤中As污染至关重要.
研究的目的:
- 调查不同剂量的Se如何影响米中的抗氧化酶活动和植物素 (PC) 生物合成,在米中种植的As污染的土壤.
- 为了澄清Se对As转换和流动性在根球中的影响.
- 阐明中介抑制吸收的基础机制.
主要方法:
- 米是在As污染的土壤中种植的,使用不同的Na2SeO3剂量 (0, 50, 200, 400μg kg−1).
- 测量了抗氧化酶活性,PC生物合成和树枝圈活性氧物种 (ROS) 度.
- 随着物种化,分析了Fe-氧化物形成和树根球微生物社区结构 (aioA基因丰度).
主要成果:
- 通过Se-200和Se-400处理,可显著降低棕大米中的As含量.
- 治疗Se-200增强了根的抗氧化酶活性 (超氧化脱酶,催化酶) 和PC含量,增加了ROS度.
- Se促进了Fe-氧化物形成和氧化成氧化,减少了的流动性;增加了aioA基因丰度,表明微生物加强了氧化.
结论:
- 通过Se-200处理,可以减轻根中As诱导的氧化应激.
- 的应用增强了通过Fe-氧化物进行As (V) 固定,并改变了树根球微生物群落,以减少As的生物可用性.
- 调查结果提供了对基于Se的策略的见解,用于管理As污染的土.
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