Fe, Mn and 238U Accumulations in Phragmites australis Naturally Growing at the Mill Tailings Pond; Iron Plaque Formation Possibly Related to Root-Endophytic Bacteria Producing Siderophores

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  • Yukihiro Nakamoto
    Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1, Tennodai, Tsukuba 305-8587, Japan
  • Kohei Doyama
    Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1, Tennodai, Tsukuba 305-8587, Japan
  • Toshikatsu Haruma
    Division of Sustainable Resources Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan
  • Xingyan Lu
    Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1, Tennodai, Tsukuba 305-8587, Japan
  • Kazuya Tanaka
    Advanced Science Research Center, Japan Atomic Energy Agency, 2-4, Shirakata, Tokai 319-1195, Japan
  • Naofumi Kozai
    Advanced Science Research Center, Japan Atomic Energy Agency, 2-4, Shirakata, Tokai 319-1195, Japan
  • Kenjin Fukuyama
    Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency, 1550, Kamisaibara, Kagamino 708-0698, Japan
  • Shigeru Fukushima
    Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency, 1550, Kamisaibara, Kagamino 708-0698, Japan
  • Yoshiyuki Ohara
    Ningyo-toge Environmental Engineering Center, Japan Atomic Energy Agency, 1550, Kamisaibara, Kagamino 708-0698, Japan
  • Keiko Yamaji
    Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1, Tennodai, Tsukuba 305-8587, Japan

説明

<jats:p>Mine drainage is a vital water problem in the mining industry worldwide because of the heavy metal elements and low pH. Rhizofiltration using wetland plants is an appropriate method to remove heavy metals from the water via accumulation in the rhizosphere. Phragmites australis is one of the candidate plants for this method because of metal accumulation, forming iron plaque around the roots. At the study site, which was the mill tailings pond in the Ningyo-toge uranium mine, P. australis has been naturally growing since 1998. The results showed that P. australis accumulated Fe, Mn, and 238U in the nodal roots without/with iron plaque compared with other plant tissues. Among the 837 bacterial colonies isolated from nodal roots, 88.6% showed siderophore production activities. Considering iron plaque formation around P. australis roots, we hypothesized that microbial siderophores might influence iron plaque formation because bacterial siderophores have catechol-like functional groups. The complex of catechol or other phenolics with Fe was precipitated due to the networks between Fe and phenolic derivatives. The experiment using bacterial products of root endophytes, such as Pseudomonas spp. and Rhizobium spp., showed precipitation with Fe ions, and we confirmed that several Pseudomonas spp. and Rhizobium spp. produced unidentified phenolic compounds. In conclusion, root-endophytic bacteria such as Pseudomonas spp. and Rhizobium spp., isolated from metal-accumulating roots of P. australis, might influence iron plaque formation as the metal accumulation site. Iron plaque formation is related to tolerance in P. australis, and Pseudomonas spp. and Rhizobium spp. might indirectly contribute to tolerance. Although there are many issues to be resolved in this research, we hope that the fundamental analysis of plant-microbe interactions would be helpful for phytoremediation at mine sites.</jats:p>

収録刊行物

  • Minerals

    Minerals 11 (12), 1337-, 2021-11-29

    MDPI AG

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