Molecular Mechanisms Involved in Caesium Uptake and Transport in Land Plants

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  • Noda Yusaku
    National Agriculture and Food Research Organization, Genetic Resources Center University of Tsukuba, Center for Research in Isotopes and Environmental Dynamics
  • Furukawa Jun
    University of Tsukuba, Center for Research in Isotopes and Environmental Dynamics

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Other Title
  • 陸上植物のセシウム吸収・輸送を制御する分子機構
  • リクジョウ ショクブツ ノ セシウム キュウシュウ ・ ユソウ オ セイギョ スル ブンシ キコウ

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Abstract

<p>Caesium (Cs) uptake in land plant is mainly carried out by potassium ion (K+) transport systems. Potassium ion uptake from the rhizosphere is regulated by two types of transport system, low affinity and high affinity transport systems, depending on the K+ concentration in soil solution. In both transport systems, there are several channels and transporters which mediate Cs+ transport also. In low affinity transport system, the inward-rectifying K+ and voltage-insensitive cation channels are involved in Cs+ uptake, while KUP/HAK/KT type transporters are the major Cs+ path in high affinity transport system. Within the plant body, Cs+ translocation is also mediated by outward-rectifying K+ channels. In addition to these Cs+ and K+ competitive transport systems, recent studies reported novel Cs+ transport systems without changing K+ behavior in plant. In this review, Cs+ transport systems dependent/independent to K+ transport mechanisms are introduced.</p>

Journal

  • RADIOISOTOPES

    RADIOISOTOPES 67 (5), 233-241, 2018-05-15

    Japan Radioisotope Association

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