不同粒径商品聚乙烯微塑料对2种蔬菜种子发芽和幼苗生长的影响
Effects of Different Commercial Polyethylene Microplastics with Different Particle Sizes on Seed Germination and Seedling Growth of Two Vegetables
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摘要: 陆地生态系统中微塑料(MPs)污染问题已成为全球关注的热点环境问题。MPs对土壤生物的影响表现出生态毒性和遗传毒性,但不同粒径MPs对典型农作物生长的影响有待深入研究。因此,本研究通过发芽实验和盆栽实验研究不同粒径(23 μm、54 μm和155 μm)的聚乙烯MPs(PE-MPs)在不同污染浓度下(0.1%、0.5%、1%、2%和5% (m∶m))对西红柿(Lycopersicon esculentum)和辣椒(Capsicum annuum L.)种子发芽、幼苗生长及根系发育的影响。结果表明,3种粒径的PE-MPs对2种作物发芽的影响存在差异。对西红柿,不同粒径的PE-MPs在高浓度(5%)下均显著抑制了种子发芽,降低了种子活性,但并无显著的粒径差异。对辣椒而言,不同粒径的PE-MPs在5%的暴露浓度下均显著降低了辣椒种子活性,且23 μm的PE-MPs抑制程度最大,但仅23 μm和54 μm的PE-MPs显著抑制了种子的发芽。盆栽实验表明,23 μm的PE-MPs在5%的暴露浓度下显著抑制了西红柿和辣椒幼苗的生长,54 μm和155 μm的PE-MPs对其影响较小。此外,对根系发育而言,2%和5%浓度的23 μm的PE-MPs暴露下,西红柿根系变得细长,但对辣椒根系无显著影响。PE-MPs对2种作物发芽的抑制效应可能是由于其在种子表皮和根毛上积累,造成物理堵塞,抑制了对水分和营养物质的吸收导致的。PE-MPs还可能通过释放添加剂对植物生长造成毒性,抑制其对水分及营养元素的吸收,改变幼苗酶活性,扰乱作物中的氧化还原稳态抑制植物幼苗生长。本研究为深入评估农业生态系统中不同粒径PE-MPs污染的生态风险提供了基础数据。Abstract: Microplastics (MPs) pollution in terrestrial ecosystems has become a hotspot environmental issue. MPs in soils showed ecotoxicity to soil organisms, but the effects of MPs with different particle sizes on the growth of typical crops are still unclear. Therefore, three polyethylene MPs (PE-MPs) with different particle sizes of 23 μm, 54 μm and 155 μm were selected to investigate their effects on tomato (Lycopersicon esculentum) and pepper (Capsicum annuum L.) including seed germination, seedling growth and root development under the different exposure concentrations of 0.1%, 0.5%, 1%, 2% and 5% (m/m) using seed germination experiments and pot experiments. The results showed that the effects of PE-MPs with three different particle sizes on the germination of two crops were different. For tomato, PE-MPs with different particle sizes significantly inhibited the germination and activity of seeds at the highest concentration of 5%, but little difference was observed among the different sized MP treatments. For pepper, PE-MPs with the different particle sizes significantly decreased the seed activity at the highest exposure concentration of 5%, and 23 μm PE-MPs showed the greatest inhibited effect on the seedling growth. However, only 23 μm and 54 μm PE-MPs posed significant inhibition on the germination of pepper. In the pot experiment, 23 μm PE-MPs significantly inhibited the seedling growth of tomato and pepper under the highest exposure concentration, while 54 μm and 155 μm PE-MPs showed non-significant effect on the seedling growth of tomato and pepper. In addition, tomato roots were elongated under the exposure of 23 μm PE-MP at the concentration of 2% and 5%, but little effect were observed on the pepper root growth. The inhibitory effect of PE-MPs on the germination of the two crop seeds could be ascribed to the accumulation of PE-MPs on the seed epidermis and root hair, which consequently could result in the physical blockage and inhibition of water and nutrient uptake. In the soil environment, PE-MPs could inhibit plant uptake of water and nutrients, reduce the enzyme activity of seedlings, disrupt the redox homeostasis, thereby inhibiting the seedling growth. These findings provide the scientific basis for evaluating the ecological risk of MPs in agricultural ecosystems.
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Key words:
- microplastics /
- seed germination /
- phytotoxicity /
- root damage /
- ecological risk
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