Genotypic variation and mechanism in uptake and translocation of perfluorooctanoic acid (PFOA) in lettuce (Lactuca sativa L.) cultivars grown in PFOA-polluted soils.
Genotypic variation and mechanism in uptake and translocation of perfluorooctanoic acid (PFOA) in lettuce (Lactuca sativa L.) cultivars grown in PFOA-polluted soils.
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DOI：
10.1016/j.scitotenv.2018.04.354
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
L. Xiang;Lei Chen;Le-Yi Yu;Peng-fei Yu;Hai-Ming Zhao;C. Mo;Yan-Wen Li;Hui Li;Q. Cai;Dong-mei Zhou;M. Wong
中科院分区：
文献类型：
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作者：
L. Xiang;Lei Chen;Le-Yi Yu;Peng-fei Yu;Hai-Ming Zhao;C. Mo;Yan-Wen Li;Hui Li;Q. Cai;Dong-mei Zhou;M. Wong
种植低污染物积累的作物品种是降低污染土壤生产的食品潜在健康风险的重要策略。在这项研究中，我们确定了三个散叶生菜品种低积累的全氟辛酸（PFOA），一个高毒性和持久性有机污染物。PFOA含量低的品种地上部中的PFOA浓度比PFOA含量高的品种低3.7-5.5倍。尽管在基于全氟辛酸每日可耐受摄入量（1.5微克/千克/天）的高度污染土壤（1毫克/千克）中种植，但鉴定全氟辛酸含量低的品种有助于确保食品安全。我们检测到较低的PFOA在根际土壤中的解吸馏分，较低的生物富集系数，和较高的分布在细胞壁和细胞器中的根，低PFOA品种，所有这些都是限制PFOA吸收和转运从土壤到地上部的关键因素，比高PFOA品种。本研究揭示了PFOA从土壤到作物的吸收机理，为建立一种经济有效的污染土壤作物种植策略，降低持久性有机污染物在作物中的暴露风险奠定了基础。
The cultivation of crop cultivars with low pollutant accumulation is an important strategy to reduce the potential health risks of food produced from polluted soils. In this study, we identified three loose-leaf lettuce cultivars with low accumulation of perfluorooctanoic acid (PFOA), a highly toxic and persistent organic pollutant. PFOA concentrations in the shoots of low-PFOA cultivars were 3.7–5.5-fold lower than those of high-PFOA cultivars. The identification of low-PFOA cultivars could contribute to ensuring food safety despite cultivation in highly polluted soils (1 mg/kg) based on the tolerable daily PFOA intake (1.5 μg/kg/d). We detected lower desorbing fractions of PFOA in rhizosphere soil, lower bioconcentration factors, and higher distribution in the cell walls and organelles of roots in low-PFOA cultivars, all of which are key factors in limiting PFOA uptake and translocation from soil to shoots, than in high-PFOA cultivars. This study reveals the mechanism of PFOA uptake from soil to crop and lays a foundation for establishing a cost-effective strategy to plant crops in polluted soil and reduce exposure risk due to persistent organic pollutants in crops.