Congener Specificity in the Accumulation of Dioxins and Dioxin-Like Compounds in Zucchini Plants Grown Hydroponically

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  • INUI Hideyuki
    Research Center for Environmental Genomics, Kobe University
  • WAKAI Taketo
    Graduate School of Science and Technology, Kobe University
  • GION Keiko
    Research Center for Environmental Genomics, Kobe University
  • YAMAZAKI Kiyoshi
    Graduate School of Agricultural Science, Kobe University
  • KIM Yun-Seok
    Chemical Analysis Research Center, National Institute for Agro-Environmental Sciences
  • EUN Heesoo
    Chemical Analysis Research Center, National Institute for Agro-Environmental Sciences

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Zucchini cultivars Cucurbita pepo subsp. ovifera cv. Patty Green and subsp. pepo cv. Gold Rush were cultivated hydroponically in a nutrient solution supplemented with a mixture of dioxins and dioxin-like compounds. Patty Green and Gold Rush showed low and high accumulation of these compounds in the aerial parts respectively. In both cultivars, the accumulation of each congener negatively depended on its hydrophobicity. This suggests that desorption and solubilization were partly responsible for congener specificity of accumulation, since this was not found in soil experiments. In contrast, no clear difference in accumulation in the roots was observed between the cultivars, whereas the translocation factors, which are indicators of efficient translocation from the roots to the aerial parts, differed among the congeners hydrophobicity-dependently. There were positive correlations between accumulation in the roots and the hydrophobicity of the polychlorinated biphenyl congeners in both cultivars. These results indicate that translocation was also partly responsible for the congener specificity and accumulation concentrations.

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