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Polystyrene microplastic-derived dissolved organic matter mitigates arsenic phytotoxicity in Tibetan hulless barley seedlings: phenotypic and transcriptomic evidence
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Polystyrene microplastic-derived dissolved organic matter mitigates arsenic phytotoxicity in Tibetan hulless barley seedlings: Phenotypic and transcriptomic evidence
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Researchers found that dissolved organic matter released from UV-aged polystyrene microplastics actually reduced arsenic toxicity in Tibetan hulless barley seedlings, increasing biomass by roughly 18-20% compared to arsenic exposure alone. The protective effect worked through two mechanisms: arsenic-DOM complexation that blocked plant uptake and enhanced cellular detoxification pathways that sequestered arsenic in vacuoles.
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Researchers found that polystyrene nanoplastics and arsenic together cause greater harm to rice seedlings than either contaminant alone, inhibiting growth, reducing chlorophyll, and increasing arsenic translocation to shoots, while humic acid significantly reduced these combined toxic effects.
The combined toxicity of polystyrene microplastic and arsenate: From the view of biochemical process in wheat seedlings (Triticum aestivum L.)
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Researchers found that when wheat seedlings were exposed to both arsenic and polystyrene microplastics together, the microplastics reduced arsenic uptake in roots but dramatically increased arsenic transport to the above-ground parts of the plant — by up to 1,000%. This combined exposure caused more oxidative stress and damage to the plants' photosynthetic systems than arsenic alone. The findings suggest that microplastics in contaminated soil could increase how much toxic metal ends up in the edible parts of crops.
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Tiny plastic particles from broken-down polystyrene (a common plastic) can be absorbed by plant roots and leaves, sometimes building up in the parts we actually eat, like grains and leafy greens. This review of existing research found that some crops (rice, lettuce, garlic) are harmed by these plastics, showing stress and stunted growth, while others (wheat) seem more resistant, meaning the risk to our food supply likely depends on what we're growing. The bottom line: we need better testing methods to understand how much of this plastic is ending up on our plates and what that means for our health.
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