New Insights into the Accumulation, Transport, and Distribution Mechanisms of Hexafluoropropylene Oxide Homologues, Important Alternatives to Perfluorooctanoic Acid, in Lettuce (Lactuca sativa L.)
文献类型： 外文期刊
作者： Chen, Lei 1 ; Chen, Daijie 1 ; Zhou, Shunyi 1 ; Lin, Jieying 1 ; Liu, Yun 1 ; Huang, Xiongfei 1 ; Lin, Qingqi 4 ; Morel, Jean Louis 5 ; Ni, Zhuobiao 4 ; Wang, Shizhong 1 ; Qiu, Rongliang 1 ;
作者机构： 1.Sun Yat Sen Univ, Sch Environm Sci & Engn, Guangzhou 510006, Peoples R China
2.Guangdong Acad Agr Sci, Vegetable Res Inst, Key Lab New Technol Res Vegetable, Guangzhou 510640, Peoples R China
3.Sun Yat Sen Univ, Guangdong Prov Engn Res Ctr Heavy Met Contaminated, Guangdong Prov Key Lab Environm Pollut Control & R, Guangzhou 510006, Peoples R China
4.South China Agr Univ, Coll Nat Resources & Environm, Guangdong Lab Lingnan Modern Agr, Guangdong Prov Key Lab Agr & Rural Pollut Abatemen, Guangzhou 510642, Peoples R China
5.Univ Lorraine, Lab Sol & Environm, INRAE, F-54500 Vandoeuvre les Nancy, France
关键词： hexafluoropropylene oxide (HFPO) homologues; lettuce(Lactuca sativa L; ); rhizosphere effect; channel uptake; tissue and subcellular distribution
期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY （ 影响因子：11.4； 五年影响因子：12.0 ）
ISSN： 0013-936X
年卷期： 2023 年
页码：
收录情况： SCI
摘要： Theaccumulation, transport, and distribution mechanismsof HFPO homologues in lettuce were investigated at the plant, tissue,and cell levels. HFPO-DA tended to accumulate in the edible parts,resulting in higher potential exposure risks. Hexafluoropropylene oxide (HFPO) homologues, which areimportantalternatives to perfluorooctanoic acid, have been frequently identifiedin crops. Although exposure to HFPO homologues via crops may posenon-negligible threats to humans, their impact on crops is still unknown.In this study, the accumulation, transport, and distribution mechanismsof three HFPO homologues in lettuce were investigated at the plant,tissue, and cell levels. More specifically, HFPO trimer acid and HFPOtetramer acid were primarily fixed in roots and hardly transportedto shoots (TF, 0.06-0.63). Conversely, HFPO dimer acid (HFPO-DA)tended to accumulate in lettuce shoots 2-264 times more thanthe other two homologues, thus resulting in higher estimated dailyintake values. Furthermore, the dissolved organic matter derived fromroot exudate enhanced HFPO-DA uptake by increasing its desorptionfractions in the rhizosphere. The transmembrane uptake of HFPO homologueswas controlled by means of a transporter-mediated active process involvinganion channels, with the uptake of HFPO-DA being additionally facilitatedby aquaporins. The higher accumulation of HFPO-DA in shoots was attributedto the larger proportions of HFPO-DA in the soluble fraction (55-74%)and its higher abundance in both vascular tissues and xylem sap. Ourfindings expand the understanding of the fate of HFPO homologues insoil-crop systems and reveal the underlying mechanisms of thepotential exposure risk to HFPO-DA.
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