Uptake Kinetics, Accumulation, and Long-Distance Transport of Organophosphate Esters in Plants: Impacts of Chemical and Plant Properties
Uptake Kinetics, Accumulation, and Long-Distance Transport of Organophosphate Esters in Plants: Impacts of Chemical and Plant Properties
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植物中有机磷酸酯的吸收动力学、积累和长距离运输：化学和植物特性的影响
DOI：
10.1021/acs.est.8b07189
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发表时间：
2019-05-07
影响因子：
11.4
通讯作者：
Zhu, Lingyan
中科院分区：
文献类型：
--
作者：
Liu, Qing;Wang, Xiaolei;Zhu, Lingyan
通过水培试验研究了4种植物对有机磷酸酯（OPEs）的吸收、积累和远距离运输。植物根系对OPEs的吸收动力学（k（1，root））是通过OPEs与植物根系和质外体汁液中蛋白质的结合来确定的，与植物对亲水性化合物的蒸腾能力有很好的相关性。而OPEs在植物根中的积累能力受OPEs在植物脂中的分配控制。结果表明，小麦根中蛋白质含量最高，对OPEs的吸收最快，而脂类含量最低，积累最少。随着疏水性的增加，OPEs的转运因子迅速下降，表明疏水性OPEs很难从根转移到地上部。三（2-氯异丙基）磷酸酯和三（2-丁氧基乙基）磷酸酯等亲水性OPEs在植物木质部和韧皮部中具有双向移动性，表明它们可以移动到植物的可食部分，增加了对人类健康的风险。
The uptake, accumulation, and long-distance transport of organophosphate esters (OPEs) in four kinds of plants were investigated by hydroponic experiments. The uptake kinetics (k(1,root)) of OPEs in plant roots were determined by the binding of OPEs with the proteins in plant roots and apoplastic sap for the hydrophobic compounds, which correlated well with the transpiration capacity of the plants for the hydrophilic compounds. However, the accumulation capacity of OPEs in plant root was controlled by the partition of OPEs to plant lipids. As a consequence, OPEs were taken up the fastest in wheat root as a result of its highest protein content but least accumulated as a result of its lowest lipid content. The translocation factor of the OPEs decreased quickly with the hydrophobicity (log K-ow) increasing, suggesting that the hydrophobic OPEs were hard to translocate from roots to shoots. The hydrophilic OPEs, such as tris(2-chloroisopropyl) phosphate and tris(2-butoxyethyl) phosphate, were ambimobile in the plant xylem and phloem, suggesting that they could move to the edible parts of plants and enhanced risk to human health.