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ORIGINAL RESEARCH article

Front. Plant Sci.
Sec. Plant Nutrition
Volume 15 - 2024 | doi: 10.3389/fpls.2024.1477223

Rice Na + absorption mediated by OsHKT2;1 affected Cs + translocation from root to shoot under low K + environments

Provisionally accepted
Satomi Kanno Satomi Kanno 1,2,3Shigeto Fujimura Shigeto Fujimura 4Junko Takahashi Junko Takahashi 2,5Chenyu Li Chenyu Li 6Takuro Shinano Takuro Shinano 4,7Shin-ichi Nakamura Shin-ichi Nakamura 8Nathalie Leonhardt Nathalie Leonhardt 3Jun Furukawa Jun Furukawa 2,5*
  • 1 Institute for Advanced Research, Nagoya University, Nagoya, Aichi, Japan
  • 2 Institute of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan
  • 3 Aix Marseille University, French Alternative Energies and Atomic Energy Commission (CEA), National Center for Scientific Research (CNRS), Bioscience and Biotechnology Institute of Aix-Marseille (BIAM), Saint-Paul-lez-Durance, France
  • 4 Tohoku Agricultural Research Center, NARO, Fukushima, Japan
  • 5 Center for Research in Radiation, Isotopes, and Earth System Sciences, University of Tsukuba, Tsukuba, Japan
  • 6 Graduate School of Science and Technology, Degree Programs in Life and Earth Sciences, University of Tsukuba, Tsukuba, Japan
  • 7 Research Faculty of Agriculture, Hokkaido University, Sapporo, Japan
  • 8 Faculty of Life Sciences, Tokyo University of Agriculture, Tokyo, Japan

The final, formatted version of the article will be published soon.

    137Cs diffused into the environment due to a nuclear power plant accident has caused serious problems for safe crop production. In plants, Cs+ is similar in its ionic form to K+. Cs+ is absorbed and transported mainly by the K+ transport mechanism. However, the full picture of the genes contributing to Cs+ transport and the transport mechanism of rice is still unclear. This study focused on OsHKT2;1, a candidate Cs+ transporter under low K+ conditions. To verify the ability of OsHKT2;1 to transport Cs+, OsHKT2;1 mutant (hkt2;1) was grown in a 137Cs-contaminated paddy field in Fukushima. The 137Cs concentration in hkt2;1 above ground was higher than in wild-type (WT) and the K concentration in these samples did not change between WT and hkt2;1, whereas the Na concentration was lower in hkt2;1. Uptake experiments with radioactive tracers (22Na+, 43K+, and 137Cs+) in hydroponic systems with different elemental compositions showed a negative correlation between Na+ and Cs+ accumulation in rice shoot cultivated under low K+ conditions. These results indicated that OsHKT2;1 does not directly contribute to Cs+ uptake but is an important factor in regulating Cs+ translocation by controlling Na+ accumulation. This indicates the possibility of controlling rice Cs content by regulating the Na+ environment during cultivation.

    Keywords: Potassium, Sodium, Cesium, OsHKT2;1, transporter, Oryza sativa L., safe food production

    Received: 07 Aug 2024; Accepted: 30 Aug 2024.

    Copyright: © 2024 Kanno, Fujimura, Takahashi, Li, Shinano, Nakamura, Leonhardt and Furukawa. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

    * Correspondence: Jun Furukawa, Institute of Life and Environmental Sciences, University of Tsukuba, Tsukuba, Japan

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