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首页> 外文期刊>Environmental Science & Technology >Enantioselective Biotransformation of Chiral PCBs in Whole Poplar Plants
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Enantioselective Biotransformation of Chiral PCBs in Whole Poplar Plants

机译：杨树全植物中手性多氯联苯的对映选择性生物转化

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Chiral PCBs have been used as molecular probes of biological metabolic processes due to their special physical, chemical, and biological properties. Many animal studies showed the enantioselective biotransformation of chiral PCBs, but it is unclear whether plants can enantioselectively biotransform chiral PCBs. In order to explore the enantioselectivity of chiral PCBs in whole plants, poplars (Populus deltoides × nigra, DN34), a model plant with complete genomic sequence, were hydroponically exposed to 2,2',3,5',6-pentachlorobiphenyl (PCB95) and 2,2',3,3',6,6'-hexa-chlorobiphenyl (PCBI36) for 20 days. PCB95 and PCB136 were shown to be absorbed, taken-up and translocated in whole poplars, and they were detected in various tissues of whole poplars. However, the enantioselectivity of poplar for PCB95 and PCB136 proved to be quite different. The first eluting enantiomer of PCB95 was enantioselectively removed in whole poplar, especially in the middle and bottom xylem. It was likely enantioselectively metabolized inside poplar tissues, in contrast to racemic mixtures of PCB95 remaining in hydroponic solutions in contact with plant roots of whole and dead poplars. Unlike PCB95, PCB136 remained nearly racemic in most parts of whole poplars after 20 days exposure. These results suggest that PCB 136 is more difficult to be enantioslectively biotransformed than PCB95 in whole poplars. This is the first evidence of enantioselectivity of chiral PCBs in whole plants, and suggests that poplars can enantioselectively biotransform at least one chiral PCB.
机译：手性多氯联苯由于其特殊的物理，化学和生物特性而被用作生物代谢过程的分子探针。许多动物研究表明，手性多氯联苯的对映选择性生物转化，但尚不清楚植物是否可以手性多氯联苯的对映选择性生物转化。为了探索整个植物中手性多氯联苯的对映选择性，将具有完整基因组序列的模型植物杨树（Populus deltoides×nigra，DN34）与2,2'，3,5'，6-五氯联苯（PCB95）水溶性接触。 ）和2,2'，3,3'，6,6'-六氯联苯（PCBI36）20天。已显示PCB95和PCB136在整个杨树中被吸收，吸收和转运，并且在整个杨树的各种组织中都检测到它们。然而，杨树对PCB95和PCB136的对映选择性被证明是完全不同的。在整个杨树中，特别是在中木质部和下部木质部中，PCB95的第一个洗脱对映体被对映选择性去除。与水杨酸溶液中残留的PCB95外消旋混合物接触全杨木和枯死杨树的植物根部相比，杨树组织内部可能对映体代谢。与PCB95不同，暴露20天后，PCB136在整个杨树的大部分区域中几乎保持消旋状态。这些结果表明，在整个杨树中，PCB 136比PCB95难于对映体生物转化。这是整个植物中手性PCB对映选择性的第一个证据，表明杨树可以对映体选择性地生物转化至少一种手性PCB。

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  • 来源
    《Environmental Science & Technology》 |2011年第6期|p.2308-2316|共9页
  • 作者

    Guangshu Zhai; Dingfei Hu; Hans-Joachim Lehmler; Jerald L. Schnoor;

  • 作者单位

    Department of Civil and Environmental Engineering and IIHR Hydroscience and Engineering, The University of Iowa, Iowa City, Iowa 52242, United States;

    Department of Civil and Environmental Engineering and IIHR Hydroscience and Engineering, The University of Iowa, Iowa City, Iowa 52242, United States;

    Department of Occupational and Environmental Health, The University of Iowa, Iowa City, Iowa 52242, United States;

    Department of Civil and Environmental Engineering and IIHR Hydroscience and Engineering, The University of Iowa, Iowa City, Iowa 52242, United States,Department of Occupational and Environmental Health, The University of Iowa, Iowa City, Iowa 52242, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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