Toxicity mechanisms of photodegraded polyvinyl chloride nanoplastics on pea seedlings

IF 6.1 2区 环境科学与生态学 Q2 ENGINEERING, ENVIRONMENTAL
Hao Wu, Beibei He, Bocheng Chen, An Liu
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Abstract

Nanoplasctics (NPs), which are very small in particle size, exert toxic effect to organisms. Additionally, compared to original NPs, photodegraded NPs would pose higher toxicity. This is because their relatively higher specific surface areas and the presence of additives which can more easily leach. How original NPs and aged NPs affect plant growth has not been widely investigated. This work chose polyvinyl chloride NPs (PVC-NPs) that were subjected to up to 1000 h UV light radiation to explore the impact of PVC-NPs on the growth of pea seedlings (Pisum Sativum L.). The results indicated the existence of PVC-NPs with longer UV light radiation time and higher concentrations had more negative influences on pea seedlings’ growth such as germination rate (decreased by 10.6%–22.5%), stem length (decreased by 2.8%–8.1%), dry weight (decreased by 6.3%–7.1%) and fresh weight (decreased by 6.7%–14.8%). It was also noted that photodegraded PVC-NPs resulted in damage to leaf stomata and roots, hindering photosynthesis and absorption of nutrients and hence the decrease in chlorophyll and soluble sugar contents. According to transcriptomic investigation results, the presence of aged PVC-NPs primarily influenced protein processing in endoplasmic reticulum (upregulated metabolic pathway) and phenylpropanoid biosynthesis (downregulated metabolic pathway) of pea seedlings. These results provide an in-depth understanding of how NPs influence the growth of plants.

Abstract Image

光降解聚氯乙烯纳米塑料对豌豆幼苗的毒性机理
纳米粒子(NPs)的粒径非常小,对生物具有毒性作用。此外,与原始 NPs 相比,光降解 NPs 的毒性更高。这是因为它们的比表面积相对较大,而且含有更容易沥滤的添加剂。原始 NPs 和老化 NPs 对植物生长的影响尚未得到广泛研究。本研究选择了经过长达 1000 小时紫外线照射的聚氯乙烯 NPs(PVC-NPs)来探讨 PVC-NPs 对豌豆幼苗(Pisum Sativum L.)生长的影响。结果表明,紫外光照射时间越长、浓度越高的 PVC-NPs 对豌豆幼苗的发芽率(降低 10.6%-22.5%)、茎长(降低 2.8%-8.1%)、干重(降低 6.3%-7.1%)和鲜重(降低 6.7%-14.8%)等生长指标的负面影响越大。研究还注意到,光降解 PVC-NPs 会导致叶片气孔和根系受损,阻碍光合作用和养分吸收,从而导致叶绿素和可溶性糖含量下降。转录组调查结果显示,老化的 PVC-NPs 主要影响豌豆幼苗内质网的蛋白质加工(上调代谢途径)和苯丙类生物合成(下调代谢途径)。这些结果有助于深入了解 NPs 如何影响植物的生长。
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来源期刊
Frontiers of Environmental Science & Engineering
Frontiers of Environmental Science & Engineering ENGINEERING, ENVIRONMENTAL-ENVIRONMENTAL SCIENCES
CiteScore
10.90
自引率
12.50%
发文量
988
审稿时长
6.1 months
期刊介绍: Frontiers of Environmental Science & Engineering (FESE) is an international journal for researchers interested in a wide range of environmental disciplines. The journal''s aim is to advance and disseminate knowledge in all main branches of environmental science & engineering. The journal emphasizes papers in developing fields, as well as papers showing the interaction between environmental disciplines and other disciplines. FESE is a bi-monthly journal. Its peer-reviewed contents consist of a broad blend of reviews, research papers, policy analyses, short communications, and opinions. Nonscheduled “special issue” and "hot topic", including a review article followed by a couple of related research articles, are organized to publish novel contributions and breaking results on all aspects of environmental field.
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