Role of the iron transporter OsNRAMP1 in cadmium uptake and accumulation in rice

Ryuichi Takahashi, Yasuhiro Ishimaru, Hiromi Nakanishi, Naoko K. Nishizawa

Research output: Contribution to journalArticlepeer-review

135 Citations (Scopus)


The heavy metal cadmium (Cd) is toxic to humans, and its accumulation in rice grains is a major agricultural problem. Rice has seven putative metal transporter NRAMP genes, but microarray analysis showed that only OsNRAMP1 is highly upregulated by iron (Fe) deficiency. OsNRAMP1 localized to the plasma membrane and transported Cd as well as Fe. OsNRAMP1 expression was observed mainly in roots and was higher in the roots of a high-Cd-accumulating cultivar (Habataki) than in those of a low-Cd-accumulating cultivar (Sasanishiki). The amino acid sequence of OsNRAMP1 in the Sasanishiki and Habataki cultivars was found to be 100% identical. These results suggest that OsNRAMP1 participates in cellular Cd uptake and that the differences observed in Cd accumulation among cultivars are because of differences in OsNRAMP1 expression levels in roots.

Original languageEnglish
Pages (from-to)1813-1816
Number of pages4
JournalPlant Signaling and Behavior
Issue number11
Publication statusPublished - 2011 Nov


  • Cadmium
  • Metal transporter
  • OsNRAMP1
  • Phytoremediation
  • Rice


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