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Morphological Rather Than Abundance Factors Control Microplastic Accumulation in Wheat Grains: A Field-Based Study
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Researchers conducted a field study on wheat crops and found that microplastic shape, rather than particle abundance, drives uptake into grain, with spherical particles translocating more readily while fibrous polystyrene particles appeared to impede absorption — the first identification of morphology as a key mechanistic factor in plant MP uptake.
< 0.05); fibrous PS likely hindered absorption. This study is the first to identify MP shape as a key factor in plant uptake, offering new mechanistic insights.
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Phytotoxic Effects of Polystyrene Microplastics on Growth Morphology, Photosynthesis, Gaseous Exchange and Oxidative Stress of Wheat Vary with Concentration and Shape
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Researchers conducted pot experiments to assess how polystyrene microplastics in different shapes and concentrations affect wheat growth, photosynthesis, and oxidative stress. They found that powder-shaped microplastics caused the most severe reductions in plant height, biomass, and chlorophyll content, especially at higher concentrations. The study suggests that both the shape and concentration of microplastics in soil play important roles in determining their phytotoxic effects on crop plants.
Microplastic shape, concentration and polymer type affect soil properties and plant biomass
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Experiments showed that microplastic shape, concentration, and polymer type all influence soil physical properties and plant biomass, with certain types reducing plant growth. The findings highlight that the wide variety of plastic particle types entering soils creates complex and variable ecological risks.
[Effects of Microplastics on the Growth, Physiology, and Biochemical Characteristics of Wheat (Triticum aestivum)].
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Wheat seedlings were grown in soils spiked with 100 nm and 5 μm polystyrene microplastics, with high concentrations (200 mg/L) significantly inhibiting root and stem elongation, reducing chlorophyll, and altering antioxidant enzyme activity, with smaller nanoplastics showing greater toxicity. The findings demonstrate that microplastic size influences phytotoxicity in a major agricultural crop.
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.
Microplastic Shape, Polymer Type, and Concentration Affect Soil Properties and Plant Biomass
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Researchers tested how microplastics of different shapes, polymer types, and concentrations affect soil properties and plant growth using carrots as a model species. They found that microplastic fibers and films had the strongest effects on soil structure and water dynamics, while fragments and foams had less impact. The study demonstrates that the physical characteristics of microplastics matter as much as their chemical composition in determining their effects on agricultural soils.
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