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Uptake and accumulation of microplastics in a cereal plant wheat
Original title: Uptake and accumulation of microplastics in a cereal plant wheat
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This Chinese-language study confirmed that wheat seedlings growing in sand culture can absorb and transport 0.2 μm polystyrene microspheres, with fluorescence microscopy revealing particle distribution in root vascular tissue and outer cortex cell walls. After 21 days, plastic microspheres were also detected in stem vascular bundles and leaf veins, demonstrating that sub-micron microplastics can translocate from soil into above-ground cereal crop tissues.
农用地土壤中微塑料的积累及分布已有报道,食用蔬菜在溶液培养下能吸收微塑料也已被发现,但微塑料能否在固相培养条件下进入禾本科作物中并在体内传递积累尚未被证实.本研究选用小麦作为模式植物,以0.2μm荧光标记聚苯乙烯微球为供试微塑料材料,采用真实河砂盆栽培养实验,结合激光共聚焦荧光显微和扫描电子显微技术,发现小麦幼苗在砂培条件下能吸收和传输0.2μm聚苯乙烯微球.小麦幼苗在含有荧光标记微球的河砂中生长21 d后,其根部维管柱和外皮层细胞壁间隙组织中呈现较强的荧光分布,表明这种亚微米级塑料微球能被小麦吸收进入根部外皮层质外体空间和维管组织.塑料微球进入根部维管柱后,可通过维管组织运输到地上部的茎部维管束和叶片的脉管组织中.研究结果为进一步认知土壤-作物系统中微塑料的传递与积累机制提供了方法学和科学依据.
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Uptake and accumulation of microplastics in a cereal plant wheat
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Wheat plants grown in sand containing fluorescent polystyrene microbeads were able to take up and translocate 0.2-micrometer particles from roots to shoots, visualized using confocal microscopy. The study confirms that crop plants can accumulate microplastics from growing media and transport them to aerial tissues, raising concerns about food chain contamination.
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Researchers used advanced microscopy to visually track label-free polystyrene microplastics as they moved through wheat seedlings from roots to shoots via the plant's water-transport system. At lower concentrations, the microplastics actually increased water uptake in roots, but at higher concentrations they significantly reduced chlorophyll and carotenoid levels. The study provides direct visual evidence that crop plants can absorb and transport microplastics, with potential consequences for plant health and food safety.
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Researchers studied how maize seedling roots take up polystyrene microplastic beads of different sizes and found that smaller particles were absorbed more readily than larger ones. Particles as small as 0.2 micrometers were detected in both roots and shoots, with the root tip being the primary uptake zone. The findings confirm that microplastics can enter food crops through their root systems, raising questions about food safety.
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