Microplastics have garnered global attention due to their potential ecological risks. Research shows micro/nano-plastics pollution has adverse effects on plant growth, development, and physiological characteristics. However, the mechanisms underlying these effects remain unclear. The study examined the effects of polystyrene micro/nano-plastics with varying sizes and concentrations on different physiological and biochemical markers of . The indicators assessed include seed viability, growth, chlorophyll content, accumulation of root reactive oxygen species, and root exudates. Using fluorescence labeling, we investigated the absorption and translocation processes of micro/nano-plastics in . We also performed transcriptomic analysis to better understand the particular mechanisms of micro/nano-plastics. It indicated that micro/nano-plastics had an adverse effect on seed germination, especially under high concentration and small particle size treatments. This effect diminished with prolonged exposure. High concentrations at 50 nm and 100 nm treatment groups significantly inhibited the growth. Conversely, low concentrations of 1000 nm had a promoting effect. Exposure to micro/nano-plastics potentially resulted in decreased chlorophyll content, the accumulation of HO in roots, and stimulated root secretion of oxalic acid. Through transcriptomic analysis, the gene expression linked to micro/nano-plastic treatments of varying sizes enriched multiple metabolic pathways, impacting plant growth, development, environmental adaptation, metabolism, pigment synthesis, and stress response.

中文翻译：

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聚苯乙烯微纳米塑料对拟南芥生理生化的影响


微塑料因其潜在的生态风险而引起了全球的关注。研究表明，微纳米塑料污染对植物生长发育和生理特性产生不利影响。然而，这些影响的机制仍不清楚。该研究考察了不同尺寸和浓度的聚苯乙烯微/纳米塑料对不同生理生化标志物的影响。评估的指标包括种子活力、生长、叶绿素含量、根部活性氧的积累和根系分泌物。利用荧光标记，我们研究了微/纳米塑料在中的吸收和易位过程。我们还进行了转录组分析，以更好地了解微/纳米塑料的特定机制。这表明微纳米塑料对种子萌发有不利影响，特别是在高浓度和小粒径处理下。这种效应随着暴露时间的延长而减弱。 50 nm 和 100 nm 处理组的高浓度显着抑制生长。相反，1000 nm 的低浓度有促进作用。暴露于微/纳米塑料可能会导致叶绿素含量下降、根部 H2O 积累，并刺激根部分泌草酸。通过转录组分析，与不同尺寸的微/纳米塑料处理相关的基因表达丰富了多种代谢途径，影响植物生长、发育、环境适应、代谢、色素合成和应激反应。