聚烯酸微塑料通过对刺激性细菌的毒性作用来降低Iris pseudacorus的等位病变潜力
Shengpeng Zuo1, Qing Zhang2, Shuo Yang2
1Collaborative Innovation Center of Recovery and Reconstruction of Degraded Ecosystem in Wanjiang Basin Co-founded by Anhui Province and Ministry of Education, School of Ecology and Environment, Anhui Normal University, Wuhu, 241003, PR China. spzuo@mails.ucas.ac.cn.
Ecotoxicology (London, England)
|February 24, 2025
概括
聚氨酸微塑料 (PCM) 通过释放有毒的氨酸,从而损害有益的根球细菌,损害湿地植物. 这降低了植物抑制有害蓝藻细菌的能力,突出了消除微塑料污染的必要性.
科学领域:
- 环境科学 环境科学
- 生态毒理学 生态毒理学
- 微生物学 微生物学
背景情况:
- 微塑料 (MP) 毒性在水生动物中得到了很好的研究,但对巨菌根球细菌的影响不太了解.
- 湿地巨型菌在抑制有害的蓝藻细菌的过程中发挥着重要作用,这些细菌受到树枝球微生物群落的影响.
- 聚烯酸微塑料 (PCM) 是新兴的环境污染物,对植物微生物相互作用的影响尚不清楚.
研究的目的:
- 为了研究PCM对湿地巨型植物Iris pseudacorus的列病潜力的剂量依赖性影响.
- 确定PCM对树枝球细菌群落的影响,以及它们在宏菌-菌相互作用中的作用.
- 阐明PCM通过哪些机制影响宏细胞基病变,包括化学变化和微生物活动.
主要方法:
- 使用消毒和未消毒的Iris pseudacorus根球土壤进行了试验,PCM的度各不相同 (10-500 mg/kg).
- 分析了巨菌根中的根活性,细菌生物多样性和二次代谢物概况.
- 评估了释放的卡普罗拉克坦对主导的树叶球细菌和基因表达 (FAD2) 的毒性影响.
主要成果:
- 未消毒的土壤增强了根活动和微囊气球菌 (Microcystis aeruginosa) 的基抑制.
- PCM (50-100 mg/kg) 显著改变了细菌的丰度,减少了根活动和生物多样性,减少了棕酸的产生.
- PCM分解释放了卡普罗拉克坦,它抑制了主导细菌和FAD2基因表达,削弱了等位基因病变的影响.
结论:
- 通过释放caprolactam,PCM通过破坏有益的根球细菌来抑制宏细胞的列病潜力.
- 这种干扰降低了巨菌控制蓝藻细菌繁殖的能力,强调了PCM污染的生态风险.
- 清除微塑料污染物对于保持健康的水生生态系统和控制有害藻类繁殖至关重要.
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