Impact of microplastic particle size on physiological and biochemical properties and rhizosphere metabolism of Zea mays L.: Comparison in different soil types.
Impact of microplastic particle size on physiological and biochemical properties and rhizosphere metabolism of Zea mays L.: Comparison in different soil types.
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DOI：
10.1016/j.scitotenv.2023.168219
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发表时间：
2023-11
期刊：
影响因子：
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通讯作者：
Yihan Zhang;Miaomiao Song;Yiming Zhu;Huan Li;Yinglei Zhang;Gaofeng Wang;Xinping Chen;
中科院分区：
文献类型：
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作者：
Yihan Zhang;Miaomiao Song;Yiming Zhu;Huan Li;Yinglei Zhang;Gaofeng Wang;Xinping Chen;
微塑料对植物生长的影响越来越受到人们的关注。然而，土壤质地和MPs的大小是否影响MPs对植物的毒理效应尚不清楚。为了解决这一知识差距，两种土壤具有不同的物理结构（石灰结核黑色和粉质壤土），以探讨潜在的毒性不同粒径的MP对玉米生长。结果表明，在两种土壤中，小分子农药对玉米生长的危害大于大分子农药。低浓度多金属磷酸盐对两种土壤类型玉米生长无显著影响，但1%浓度的大分子多金属磷酸盐对砂姜黑土玉米干生物量有促进作用，而对粉壤土玉米干生物量有抑制作用。所有MPs暴露处理均导致玉米根系超氧阴离子水平升高，导致根系通气组织面积增加，降低了玉米根系的代谢活性。代谢组学研究表明，多金属蛋白酶处理影响了根系中多条氨基酸代谢途径，包括苯丙氨酸和酪氨酸代谢，抑制了木质素的合成。该研究为更全面地评价农药污染对农业生产的影响提供了理论依据。
The effect of microplastics (MPs) on plant growth has received increasing attention. However, whether soil texture and MPs size influence the toxicological effects of MPs on plants is unknown. To address this knowledge gap, two soils with different physical structures (lime concretion black and silty loam soils) were selected to explore the potential toxicity of MPs of different particle sizes to maize growth. The results showed that, in both soils, the harm caused by small MPs on maize growth was greater than that caused by large MPs. Low MPs concentrations had no significant effect on maize growth between two soil types; however, when exposed to a concentration of 1 % large MPs, the dry biomass of maize was promoted in lime concretion black soil but inhibited in silty loam soil. All MPs-exposed treatments resulted in a high level of superoxide anions in maize roots, resulting in an increase in the root aerenchyma area and reducing the metabolic activity of maize roots. Metabolomics showed that MPs exposure affected multiple amino acid metabolic pathways, including phenylalanine and tyrosine metabolism, and inhibited lignin biosynthesis in roots. This study provides a theoretical basis for a more comprehensive assessment of the effect of MPs pollution on agricultural production.