Involvement of Silicon Transporters in Arsenic Uptake in Rice

DOI

Bibliographic Information

Other Title
  • イネのヒ素吸収におけるケイ酸輸送体の関与

Abstract

Arsenic intake from contaminated crops is a threat for human heath. It is estimated that more than tens millions of people are exposed to risk of chronic toxicity and carcinogenesis. In paddy field, As is mainly present in the form of arsenite (As(III)). However, the molecular mechanism responsible for As(III) uptake is unknown in rice. In the present study, we report that both Si influx transporter (Lsi1) and efflux transporter (Lsi2) are involved in As uptake. <br> A short-term uptake experiment showed that both lsi1 and lsi2 mutants defective in Si uptake accumulated less As in the shoots. Addition of Si significantly decreased the As accumulation in the wild-type rice, but not in the mutants. When Lsi1 was expressed in the yeast or Xenopus oocytes, an increased transport activity for As(III), but not for As(V) was observed. These results suggest that Lsi1 and Lsi2 are involved in As(III) uptake.

Journal

Details 詳細情報について

  • CRID
    1390282680606662784
  • NII Article ID
    130006990424
  • DOI
    10.14841/jspp.2008.0.0510.0
  • Data Source
    • JaLC
    • CiNii Articles
  • Abstract License Flag
    Disallowed

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