Ascorbic acid enhances the accumulation of polycyclic aromatic hydrocarbons (PAHs) in roots of tall fescue (Festuca arundinacea Schreb.).

Ascorbic acid enhances the accumulation of polycyclic aromatic hydrocarbons (PAHs) in roots of tall fescue (Festuca arundinacea Schreb.).
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DOI:
10.1371/journal.pone.0050467
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发表时间:
2012
期刊:
影响因子:
3.7
通讯作者:
Gong S
Gong S
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Gao Y;Li H;Gong S

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多环芳烃(PAHs)对植物的污染对食品安全和人类健康至关重要。酶抑制剂在农业中常被用于控制植物对有机成分的代谢。本研究表明,酶抑制剂抗坏血酸(AA)显著降低了过氧化物酶(POD)和多酚氧化酶(PPO)的活性,从而增加了高羊茅(Festuca arundinacea Schreb.)受多环芳烃污染的潜在风险。体外的POD和PPO酶能有效分解萘(NAP)、菲(PHE)和蒽(ANT)。AA的存在降低了植物中POD和PPO的活性,因此可能是导致高羊茅中多环芳烃积累增加的原因。这一结论得到了以下事实的支持:在有AA存在的情况下,植物对PHE的吸收显著增加,以及酶抑制效率与高羊茅根部PHE代谢速率之间呈正相关。本研究提供了一个新的视角,即酶抑制剂在农业生产中的普遍应用可能会增加植物中有机污染物的积累,从而增加食品安全和质量风险。
Plant contamination by polycyclic aromatic hydrocarbons (PAHs) is crucial to food safety and human health. Enzyme inhibitors are commonly utilized in agriculture to control plant metabolism of organic components. This study revealed that the enzyme inhibitor ascorbic acid (AA) significantly reduced the activities of peroxidase (POD) and polyphenol oxidase (PPO), thus enhancing the potential risks of PAH contamination in tall fescue (Festuca arundinacea Schreb.). POD and PPO enzymes in vitro effectively decomposed naphthalene (NAP), phenanthrene (PHE) and anthracene (ANT). The presence of AA reduced POD and PPO activities in plants, and thus was likely responsible for enhanced PAH accumulation in tall fescue. This conclusion is supported by the significantly enhanced uptake of PHE in plants in the presence of AA, and the positive correlation between enzyme inhibition efficiencies and the rates of metabolism of PHE in tall fescue roots. This study provides a new perspective, that the common application of enzyme inhibitors in agricultural production could increase the accumulation of organic contaminants in plants, hence enhancing risks to food safety and quality.
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