Effects and molecular mechanisms of polyethylene microplastic oxidation on wheat grain quality

化学 微塑料 毒性 淀粉 食品科学 抗氧化剂 蔗糖 碳水化合物代谢 脂质氧化 生物化学 环境化学 有机化学
作者
Yan Yan,Huijie Yang,Yuan Du,Xiaoqiang Li,Xiaokang Li
出处
期刊:Journal of Hazardous Materials [Elsevier]
卷期号:474: 134816-134816
标识
DOI:10.1016/j.jhazmat.2024.134816
摘要

Polyethylene microplastics (PE MPs) are the main MPs in agricultural soils and undergo oxidation upon environmental exposure. However, the influence of MP oxidation on phytotoxicity (especially for crop fruit) is still limited. This study aimed to explore the effect of PE MP oxidation on crop toxicity. Herein, a combination of plant phenotyping, metabolomic, and transcriptomic approaches was used to evaluate the effects of low-oxidation PE (LOPE) and high-oxidation PE (HOPE) on wheat growth, grain quality, and related molecular mechanisms using pot experiments. The results showed that HOPE induced a stronger inhibition of wheat growth and reduction in protein content and mineral elements than LOPE. This was accompanied by root ultrastructural damage and downregulation of carbohydrate metabolism, translation, nutrient reservoir activity, and metal ion binding gene expression. Compared with HOPE, LOPE activated a stronger plant defense response by reducing the starch content by 22.87 %, increasing soluble sugar content by 44.93 %, and upregulating antioxidant enzyme genes and crucial metabolic pathways (e.g., starch and sucrose, linoleic acid, and phenylalanine metabolism). The presence of PE MPs in the environment exacerbates crop growth inhibition and fruit quality deterioration, highlighting the need to consider the environmental and food safety implications of MPs in agricultural soils.
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